From: Benjamin Auder <benjamin.auder@somewhere>
Date: Thu, 27 Feb 2020 23:41:50 +0000 (+0100)
Subject: Implemented multi-move possibility in a moves list => better support for multi-moves... 
X-Git-Url: https://git.auder.net/?p=vchess.git;a=commitdiff_plain;h=e71161fbfffe53b0f4b174e0467cdd98cc70b7b0

Implemented multi-move possibility in a moves list => better support for multi-moves variants
---

diff --git a/client/public/images/pieces/Check3/bk_1.svg b/client/public/images/pieces/Check3/bk_1.svg
new file mode 100644
index 00000000..04043f81
--- /dev/null
+++ b/client/public/images/pieces/Check3/bk_1.svg
@@ -0,0 +1,16 @@
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diff --git a/client/public/images/pieces/Check3/bk_2.svg b/client/public/images/pieces/Check3/bk_2.svg
new file mode 100644
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diff --git a/client/public/images/pieces/Check3/wk_1.svg b/client/public/images/pieces/Check3/wk_1.svg
new file mode 100644
index 00000000..5b66331a
--- /dev/null
+++ b/client/public/images/pieces/Check3/wk_1.svg
@@ -0,0 +1,15 @@
+<svg width="2048" height="2048" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg">
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+ </g>
+</svg>
diff --git a/client/src/base_rules.js b/client/src/base_rules.js
index db9b981a..e6fd6d73 100644
--- a/client/src/base_rules.js
+++ b/client/src/base_rules.js
@@ -1126,7 +1126,7 @@ export const ChessRules = class ChessRules {
     let moves1 = this.getAllValidMoves("computer");
 
     if (moves1.length == 0)
-      //TODO: this situation should not happen
+      // TODO: this situation should not happen
       return null;
 
     // Can I mate in 1 ? (for Magnetic & Extinction)
diff --git a/client/src/components/BaseGame.vue b/client/src/components/BaseGame.vue
index 3573643d..488567b5 100644
--- a/client/src/components/BaseGame.vue
+++ b/client/src/components/BaseGame.vue
@@ -1,10 +1,5 @@
 <template lang="pug">
-div#baseGame(
-  tabindex=-1
-  @click="focusBg()"
-  @keydown="handleKeys($event)"
-  @wheel="handleScroll($event)"
-)
+div#baseGame
   input#modalEog.modal(type="checkbox")
   div#eogDiv(
     role="dialog"
@@ -86,26 +81,30 @@ import { getSquareId } from "@/utils/squareId";
 import { getDate } from "@/utils/datetime";
 import { processModalClick } from "@/utils/modalClick";
 import { getScoreMessage } from "@/utils/scoring";
+import { getFullNotation } from "@/utils/notation";
+import { undoMove } from "@/utils/playUndo";
 export default {
   name: "my-base-game",
   components: {
     Board,
     MoveList
   },
-  // "vr": VariantRules object, describing the game state + rules
-  props: ["vr", "game"],
+  props: ["game"],
   data: function() {
     return {
       st: store.state,
       // NOTE: all following variables must be reset at the beginning of a game
+      vr: null, //VariantRules object, game state
       endgameMessage: "",
       orientation: "w",
       score: "*", //'*' means 'unfinished'
       moves: [],
+      // TODO: later, use subCursor to navigate intra-multimoves?
       cursor: -1, //index of the move just played
       lastMove: null,
       firstMoveNumber: 0, //for printing
-      incheck: [] //for Board
+      incheck: [], //for Board
+      inMultimove: false
     };
   },
   watch: {
@@ -151,6 +150,14 @@ export default {
     if (this.game.fenStart) this.re_setVariables();
   },
   mounted: function() {
+    if (!("ontouchstart" in window)) {
+      // Desktop browser:
+      const baseGameDiv = document.getElementById("baseGame");
+      baseGameDiv.tabIndex = 0;
+      baseGameDiv.addEventListener("click", this.focusBg);
+      baseGameDiv.addEventListener("keydown", this.handleKeys);
+      baseGameDiv.addEventListener("wheel", this.handleScroll);
+    }
     [
       document.getElementById("eogDiv"),
       document.getElementById("adjuster")
@@ -221,12 +228,9 @@ export default {
       }
     },
     handleScroll: function(e) {
-      // NOTE: since game.mode=="analyze" => no score, next condition is enough
-      if (this.game.score != "*") {
-        e.preventDefault();
-        if (e.deltaY < 0) this.undo();
-        else if (e.deltaY > 0) this.play();
-      }
+      e.preventDefault();
+      if (e.deltaY < 0) this.undo();
+      else if (e.deltaY > 0) this.play();
     },
     showRules: function() {
       //this.$router.push("/variants/" + this.game.vname);
@@ -237,30 +241,43 @@ export default {
       // "w": default orientation for observed games
       this.orientation = this.game.mycolor || "w";
       this.moves = JSON.parse(JSON.stringify(this.game.moves || []));
-      // Post-processing: decorate each move with color, notation and FEN
-      let vr_tmp = new V(this.game.fenStart);
+      // Post-processing: decorate each move with notation and FEN
+      this.vr = new V(this.game.fenStart);
       const parsedFen = V.ParseFen(this.game.fenStart);
       const firstMoveColor = parsedFen.turn;
       this.firstMoveNumber = Math.floor(parsedFen.movesCount / 2);
       this.moves.forEach(move => {
-        move.color = vr_tmp.turn;
-        move.notation = vr_tmp.getNotation(move);
-        vr_tmp.play(move);
-        move.fen = vr_tmp.getFen();
+        // Strategy working also for multi-moves:
+        if (!Array.isArray(move)) move = [move];
+        move.forEach(m => {
+          m.notation = this.vr.getNotation(m);
+          this.vr.play(m);
+        });
       });
       if (firstMoveColor == "b") {
         // 'end' is required for Board component to check lastMove for e.p.
         this.moves.unshift({
-          color: "w",
           notation: "...",
           end: { x: -1, y: -1 }
         });
       }
-      const L = this.moves.length;
-      this.cursor = L - 1;
-      this.lastMove = L > 0 ? this.moves[L - 1] : null;
+      this.positionCursorTo(this.moves.length - 1);
       this.incheck = this.vr.getCheckSquares(this.vr.turn);
     },
+    positionCursorTo: function(index) {
+      this.cursor = index;
+      // Caution: last move in moves array might be a multi-move
+      if (index >= 0) {
+        if (Array.isArray(this.moves[index])) {
+          const L = this.moves[index].length;
+          this.lastMove = this.moves[index][L - 1];
+        } else {
+          this.lastMove = this.moves[index];
+        }
+      }
+      else
+        this.lastMove = null;
+    },
     analyzePosition: function() {
       const newUrl =
         "/analyse/" +
@@ -289,17 +306,10 @@ export default {
       pgn += '[Black "' + this.game.players[1].name + '"]\n';
       pgn += '[Fen "' + this.game.fenStart + '"]\n';
       pgn += '[Result "' + this.game.score + '"]\n\n';
-      let counter = 1;
-      let i = 0;
-      while (i < this.moves.length) {
-        pgn += counter++ + ".";
-        for (let color of ["w", "b"]) {
-          let move = "";
-          while (i < this.moves.length && this.moves[i].color == color)
-            move += this.moves[i++].notation + ",";
-          move = move.slice(0, -1); //remove last comma
-          pgn += move + (i < this.moves.length ? " " : "");
-        }
+      for (let i = 0; i < this.moves.length; i += 2) {
+        pgn += (i/2+1) + "." + getFullNotation(this.moves[i]) + " ";
+        if (i+1 < this.moves.length)
+          pgn += getFullNotation(this.moves[i+1]) + " ";
       }
       return pgn + "\n";
     },
@@ -311,6 +321,7 @@ export default {
         modalBox.checked = false;
       }, 2000);
     },
+    // Animate an elementary move
     animateMove: function(move, callback) {
       let startSquare = document.getElementById(getSquareId(move.start));
       let endSquare = document.getElementById(getSquareId(move.end));
@@ -341,88 +352,167 @@ export default {
         callback();
       }, 250);
     },
-    play: function(move, receive) {
-      // NOTE: navigate and receive are mutually exclusive
+    // "light": if gotoMove() or gotoEnd()
+    // data: some custom data (addTime) to be re-emitted
+    play: function(move, received, light, data) {
       const navigate = !move;
+      const playSubmove = (smove) => {
+        if (!navigate) smove.notation = this.vr.getNotation(smove);
+        this.vr.play(smove);
+        this.lastMove = smove;
+        // Is opponent in check?
+        this.incheck = this.vr.getCheckSquares(this.vr.turn);
+        if (!navigate) {
+          if (!this.inMultimove) {
+            if (this.cursor < this.moves.length - 1)
+              this.moves = this.moves.slice(0, Math.max(this.cursor, 0));
+            this.moves.push(smove);
+            this.inMultimove = true; //potentially
+            this.cursor++;
+          } else {
+            // Already in the middle of a multi-move
+            const L = this.moves.length;
+            if (!Array.isArray(this.moves[L-1]))
+              this.$set(this.moves, L-1, [this.moves[L-1], smove]);
+            else
+              this.$set(this.moves, L-1, this.moves.concat([smove]));
+          }
+        }
+      };
+      const playMove = () => {
+        const animate = V.ShowMoves == "all" && received;
+        if (!Array.isArray(move)) move = [move];
+        let moveIdx = 0;
+        let self = this;
+        const initurn = this.vr.turn;
+        (function executeMove() {
+          const smove = move[moveIdx++];
+          if (animate) {
+            self.animateMove(smove, () => {
+              playSubmove(smove);
+              if (moveIdx < move.length)
+                setTimeout(executeMove, 500);
+              else afterMove(smove, initurn);
+            });
+          } else {
+            playSubmove(smove);
+            if (moveIdx < move.length) executeMove();
+            else afterMove(smove, initurn);
+          }
+        })();
+      };
+      const afterMove = (smove, initurn) => {
+        if (this.st.settings.sound == 2)
+          new Audio("/sounds/move.mp3").play().catch(() => {});
+        if (this.vr.turn != initurn) {
+          // Turn has changed: move is complete
+          this.inMultimove = false;
+          const score = this.vr.getCurrentScore();
+          if (score != "*") {
+            const message = getScoreMessage(score);
+            if (!navigate && this.game.mode != "analyze")
+              this.$emit("gameover", score, message);
+            // Just show score on screen (allow undo)
+            else this.showEndgameMsg(score + " . " + message);
+          }
+          if (!navigate && this.game.mode != "analyze") {
+            const L = this.moves.length;
+            // Post-processing (e.g. computer play)
+            this.$emit("newmove", this.moves[L-1], data);
+          }
+        }
+      };
+      // NOTE: navigate and received are mutually exclusive
+      if (navigate) {
+        // The move to navigate to is necessarily full:
+        if (this.cursor == this.moves.length - 1) return; //no more moves
+        move = this.moves[this.cursor + 1];
+        if (light) {
+          // Just play the move, nothing else:
+          if (!Array.isArray(move)) move = [move];
+          for (let i=0; i < move.length; i++) this.vr.play(move[i]);
+        }
+        else playMove();
+        this.cursor++;
+        return;
+      }
       // Forbid playing outside analyze mode, except if move is received.
       // Sufficient condition because Board already knows which turn it is.
       if (
-        !navigate &&
         this.game.mode != "analyze" &&
-        !receive &&
+        !received &&
         (this.game.score != "*" || this.cursor < this.moves.length - 1)
       ) {
         return;
       }
-      const doPlayMove = () => {
-        // To play a move, cursor must be at the end of the game:
-        if (!!receive && this.cursor < this.moves.length - 1) this.gotoEnd();
-        if (navigate) {
-          if (this.cursor == this.moves.length - 1) return; //no more moves
-          move = this.moves[this.cursor + 1];
-        } else {
-          move.color = this.vr.turn;
-          move.notation = this.vr.getNotation(move);
-        }
-        this.vr.play(move);
-        this.cursor++;
-        this.lastMove = move;
-        if (this.st.settings.sound == 2)
-          new Audio("/sounds/move.mp3").play().catch(() => {});
-        if (!navigate) {
-          move.fen = this.vr.getFen();
-          // Stack move on movesList at current cursor
-          if (this.cursor == this.moves.length) this.moves.push(move);
-          else this.moves = this.moves.slice(0, this.cursor).concat([move]);
-        }
-        // Is opponent in check?
+      // To play a received move, cursor must be at the end of the game:
+      if (received && this.cursor < this.moves.length - 1)
+        this.gotoEnd();
+      playMove();
+    },
+    cancelCurrentMultimove: function() {
+      // Cancel current multi-move
+      const L = this.moves.length;
+      let move = this.moves[L-1];
+      if (!Array.isArray(move)) move = [move];
+      for (let i=move.length -1; i >= 0; i--) this.vr.undo(move[i]);
+      this.moves.pop();
+      this.cursor--;
+      this.inMultimove = false;
+    },
+    cancelLastMove: function() {
+      // The last played move was canceled (corr game)
+      this.undo();
+      this.moves.pop();
+    },
+    // "light": if gotoMove() or gotoBegin()
+    undo: function(move, light) {
+      if (this.inMultimove) {
+        this.cancelCurrentMultimove();
         this.incheck = this.vr.getCheckSquares(this.vr.turn);
-        const score = this.vr.getCurrentScore();
-        if (score != "*") {
-          const message = getScoreMessage(score);
-          if (this.game.mode != "analyze")
-            this.$emit("gameover", score, message);
-          //just show score on screen (allow undo)
-          else this.showEndgameMsg(score + " . " + message);
+      } else {
+        if (!move) {
+          if (this.cursor < 0) return; //no more moves
+          move = this.moves[this.cursor];
+        }
+        // Caution; if multi-move, undo all submoves from last to first
+        undoMove(move, this.vr);
+        if (light) this.cursor--;
+        else {
+          this.positionCursorTo(this.cursor - 1);
+          if (this.st.settings.sound == 2)
+            new Audio("/sounds/undo.mp3").play().catch(() => {});
+          this.incheck = this.vr.getCheckSquares(this.vr.turn);
         }
-        if (!navigate && this.game.mode != "analyze")
-          this.$emit("newmove", move); //post-processing (e.g. computer play)
-      };
-      if (!!receive && V.ShowMoves == "all")
-        this.animateMove(move, doPlayMove);
-      else doPlayMove();
-    },
-    undo: function(move) {
-      const navigate = !move;
-      if (navigate) {
-        if (this.cursor < 0) return; //no more moves
-        move = this.moves[this.cursor];
       }
-      this.vr.undo(move);
-      this.cursor--;
-      this.lastMove = this.cursor >= 0 ? this.moves[this.cursor] : undefined;
-      if (this.st.settings.sound == 2)
-        new Audio("/sounds/undo.mp3").play().catch(() => {});
-      this.incheck = this.vr.getCheckSquares(this.vr.turn);
-      if (!navigate) this.moves.pop();
     },
     gotoMove: function(index) {
-      this.vr.re_init(this.moves[index].fen);
-      this.cursor = index;
-      this.lastMove = this.moves[index];
+      if (this.inMultimove) this.cancelCurrentMultimove();
+      if (index == this.cursor) return;
+      if (index < this.cursor) {
+        while (this.cursor > index)
+          this.undo(null, null, "light");
+      }
+      else {
+        // index > this.cursor)
+        while (this.cursor < index)
+          this.play(null, null, "light");
+      }
+      // NOTE: next line also re-assign cursor, but it's very light
+      this.positionCursorTo(index);
       this.incheck = this.vr.getCheckSquares(this.vr.turn);
     },
     gotoBegin: function() {
-      if (this.cursor == -1) return;
-      this.vr.re_init(this.game.fenStart);
+      if (this.inMultimove) this.cancelCurrentMultimove();
+      while (this.cursor >= 0)
+        this.undo(null, null, "light");
       if (this.moves.length > 0 && this.moves[0].notation == "...") {
         this.cursor = 0;
         this.lastMove = this.moves[0];
       } else {
-        this.cursor = -1;
         this.lastMove = null;
       }
-      this.incheck = this.vr.getCheckSquares(this.vr.turn);
+      this.incheck = [];
     },
     gotoEnd: function() {
       if (this.cursor == this.moves.length - 1) return;
diff --git a/client/src/components/ComputerGame.vue b/client/src/components/ComputerGame.vue
index 1181971b..aee1f70e 100644
--- a/client/src/components/ComputerGame.vue
+++ b/client/src/components/ComputerGame.vue
@@ -2,7 +2,6 @@
 BaseGame(
   ref="basegame"
   :game="game"
-  :vr="vr"
   @newmove="processMove"
   @gameover="gameOver"
 )
@@ -12,6 +11,7 @@ BaseGame(
 import BaseGame from "@/components/BaseGame.vue";
 import { store } from "@/store";
 import { CompgameStorage } from "@/utils/compgameStorage";
+import { playMove, getFilteredMove } from "@/utils/playUndo";
 import Worker from "worker-loader!@/playCompMove";
 export default {
   name: "my-computer-game",
@@ -37,31 +37,17 @@ export default {
     this.compWorker = new Worker();
     this.compWorker.onmessage = e => {
       let compMove = e.data;
-      if (!compMove) {
-        this.compThink = false;
-        this.$emit("game-stopped"); //no more moves: mate or stalemate
-        return; //after game ends, no more moves, nothing to do
-      }
-      if (!Array.isArray(compMove)) compMove = [compMove]; //potential multi-move
       // Small delay for the bot to appear "more human"
       const delay = Math.max(500 - (Date.now() - this.timeStart), 0);
+      let self = this;
       setTimeout(() => {
         if (this.currentUrl != document.location.href) return; //page change
-        // NOTE: do not animate move if special display (ShowMoves != "all")
-        const animate = V.ShowMoves == "all";
-        const animDelay = animate ? 250 : 0;
-        let moveIdx = 0;
-        let self = this;
-        (function executeMove() {
-          // NOTE: BaseGame::play() will trigger processMove() here
-          self.$refs["basegame"].play(compMove[moveIdx++], "received");
-          if (moveIdx >= compMove.length) {
-            self.compThink = false;
-            if (self.game.score != "*")
-              // User action
-              self.$emit("game-stopped");
-          } else setTimeout(executeMove, 500 + animDelay);
-        })();
+        // NOTE: BaseGame::play() will trigger processMove() here
+        self.$refs["basegame"].play(compMove, "received");
+        self.compThink = false;
+        if (self.game.score != "*")
+          // User action
+          self.$emit("game-stopped");
       }, delay);
     };
   },
@@ -99,28 +85,19 @@ export default {
       this.compWorker.postMessage(["askmove"]);
     },
     processMove: function(move) {
+      playMove(move, this.vr);
+      // This move could have ended the game: if this is the case,
+      // the game is already removed from storage (if mode == 'versus')
       if (this.game.score != "*") return;
       // Send the move to web worker (including his own moves)
       this.compWorker.postMessage(["newmove", move]);
-      // subTurn condition for Marseille (and Avalanche) rules
-      if (
-        (!this.vr.subTurn || this.vr.subTurn <= 1) &&
-        (this.gameInfo.mode == "auto" || this.vr.turn != this.game.mycolor)
-      ) {
+      if (this.gameInfo.mode == "auto" || this.vr.turn != this.game.mycolor)
         this.playComputerMove();
-      }
       // Finally, update storage:
       if (this.gameInfo.mode == "versus") {
-        const allowed_fields = ["appear", "vanish", "start", "end"];
-        const filtered_move = Object.keys(move)
-          .filter(key => allowed_fields.includes(key))
-          .reduce((obj, key) => {
-            obj[key] = move[key];
-            return obj;
-          }, {});
         CompgameStorage.update(this.gameInfo.vname, {
-          move: filtered_move,
-          fen: move.fen
+          move: getFilteredMove(move),
+          fen: this.vr.getFen()
         });
       }
     },
diff --git a/client/src/components/MoveList.vue b/client/src/components/MoveList.vue
index 6df5a70a..b238758c 100644
--- a/client/src/components/MoveList.vue
+++ b/client/src/components/MoveList.vue
@@ -1,100 +1,32 @@
+<template lang="pug">
+div
+  #scoreInfo(v-if="score!='*'")
+    p {{ score }}
+    p {{ message }}
+  .moves-list
+    .tr(v-for="moveIdx in evenNumbers")
+      .td {{ firstNum + moveIdx / 2 + 1 }}
+      .td(v-if="moveIdx < moves.length-1 || show == 'all'"
+        :class="{'highlight-lm': cursor == moveIdx}"
+        @click="() => gotoMove(moveIdx)"
+      )
+        | {{ notation(moves[moveIdx]) }}
+      .td(
+        v-if="moveIdx < moves.length-1"
+        :class="{'highlight-lm': cursor == moveIdx+1}"
+        @click="() => gotoMove(moveIdx+1)"
+      )
+        | {{ notation(moves[moveIdx+1]) }}
+      // Else: just add an empty cell
+      //.td(v-else)
+</template>
+
 <script>
 import { store } from "@/store";
+import { getFullNotation } from "@/utils/notation";
 export default {
   name: "my-move-list",
   props: ["moves", "show", "cursor", "score", "message", "firstNum"],
-  // TODO: if show == "byrows", show only full rows.
-  render(h) {
-    let rootElements = [];
-    if (!!this.score && this.score != "*") {
-      const scoreDiv = h(
-        "div",
-        {
-          id: "scoreInfo",
-          style: {
-            display: this.score != "*" ? "block" : "none"
-          }
-        },
-        [h("p", this.score), h("p", store.state.tr[this.message])]
-      );
-      rootElements.push(scoreDiv);
-    }
-    if (this.moves.length > 0) {
-      let tableContent = [];
-      let moveCounter = 0;
-      let tableRow = undefined;
-      let moveCells = undefined;
-      let curCellContent = "";
-      let firstIndex = 0;
-      for (let i = 0; i < this.moves.length; i++) {
-        if (this.moves[i].color == "w") {
-          if (i == 0 || (i > 0 && this.moves[i - 1].color == "b")) {
-            if (tableRow) {
-              tableRow.children = moveCells;
-              tableContent.push(tableRow);
-            }
-            moveCells = [
-              h(
-                "div",
-                {
-                  "class": {td: true},
-                  domProps: { innerHTML: ++moveCounter + "." }
-                }
-              )
-            ];
-            tableRow = h("div", {"class": {tr: true}});
-            curCellContent = "";
-            firstIndex = i;
-          }
-        }
-        // Next condition is fine because even if the first move is black,
-        // there will be the "..." which count as white move.
-        else if (this.moves[i].color == "b" && this.moves[i - 1].color == "w")
-          firstIndex = i;
-        curCellContent += this.moves[i].notation;
-        if (
-          i < this.moves.length - 1 &&
-          this.moves[i + 1].color == this.moves[i].color
-        )
-          curCellContent += ",";
-        else {
-          // Color change
-          moveCells.push(
-            h(
-              "div",
-              {
-                "class": {
-                  td: true,
-                  "highlight-lm": this.cursor >= firstIndex && this.cursor <= i
-                },
-                domProps: { innerHTML: curCellContent },
-                on: { click: () => this.gotoMove(i) }
-              }
-            )
-          );
-          curCellContent = "";
-        }
-      }
-      // Complete last row, which might not be full:
-      if (moveCells.length - 1 == 1) {
-        moveCells.push(h("div", {"class": {td: true}}));
-      }
-      tableRow.children = moveCells;
-      tableContent.push(tableRow);
-      rootElements.push(
-        h(
-          "div",
-          {
-            class: {
-              "moves-list": true
-            }
-          },
-          tableContent
-        )
-      );
-    }
-    return h("div", {}, rootElements);
-  },
   watch: {
     cursor: function(newCursor) {
       if (window.innerWidth <= 767) return; //scrolling would hide chessboard
@@ -110,7 +42,15 @@ export default {
       });
     }
   },
+  computed: {
+    evenNumbers: function() {
+      return [...Array(this.moves.length).keys()].filter(i => i%2==0);
+    }
+  },
   methods: {
+    notation: function(move) {
+      return getFullNotation(move);
+    },
     gotoMove: function(index) {
       this.$emit("goto-move", index);
     }
diff --git a/client/src/components/UpsertUser.vue b/client/src/components/UpsertUser.vue
index b5c6fbe4..50b702da 100644
--- a/client/src/components/UpsertUser.vue
+++ b/client/src/components/UpsertUser.vue
@@ -181,7 +181,7 @@ export default {
 
 <style lang="sass" scoped>
 [type="checkbox"].modal+div .card
-  max-width: 370px
+  max-width: 450px
   max-height: 100%
 
 #dialog
diff --git a/client/src/playCompMove.js b/client/src/playCompMove.js
index d8dd2d47..05c2286c 100644
--- a/client/src/playCompMove.js
+++ b/client/src/playCompMove.js
@@ -12,7 +12,11 @@ onmessage = async function(e) {
       break;
     }
     case "newmove":
-      self.vr.play(e.data[1]);
+      let move = e.data[1];
+      // Caution: could be a multi-move
+      if (!Array.isArray(move))
+        move = [move];
+      move.forEach(m => self.vr.play(m));
       break;
     case "askmove": {
       const compMove = self.vr.getComputerMove();
diff --git a/client/src/translations/about/en.pug b/client/src/translations/about/en.pug
index 4bc7ed40..4cc69425 100644
--- a/client/src/translations/about/en.pug
+++ b/client/src/translations/about/en.pug
@@ -40,6 +40,7 @@ p.
 h3 Links
 
 #links
+  a(href="https://greenchess.net/") greenchess.net
   a(href="https://www.chessvariants.com/") chessvariants.com
   a(href="https://schemingmind.com/") schemingmind.com
   div
diff --git a/client/src/translations/about/es.pug b/client/src/translations/about/es.pug
index e6480f0b..3643ba82 100644
--- a/client/src/translations/about/es.pug
+++ b/client/src/translations/about/es.pug
@@ -38,6 +38,7 @@ p
 h3 Enlaces
 
 #links
+  a(href="https://greenchess.net/") greenchess.net
   a(href="https://www.chessvariants.com/") chessvariants.com
   a(href="https://schemingmind.com/") schemingmind.com
   div
diff --git a/client/src/translations/about/fr.pug b/client/src/translations/about/fr.pug
index b7092f02..bc9f51b2 100644
--- a/client/src/translations/about/fr.pug
+++ b/client/src/translations/about/fr.pug
@@ -38,6 +38,7 @@ p.
 h3 Liens
 
 #links
+  a(href="https://greenchess.net/") greenchess.net
   a(href="https://www.chessvariants.com/") chessvariants.com
   a(href="https://schemingmind.com/") schemingmind.com
   a(href="https://echekk.fr/spip.php?page=rubrique&id_rubrique=1") echekk.fr
diff --git a/client/src/utils/notation.js b/client/src/utils/notation.js
new file mode 100644
index 00000000..464b5eee
--- /dev/null
+++ b/client/src/utils/notation.js
@@ -0,0 +1,12 @@
+// Take into account that the move may be a multi-move
+export function getFullNotation(move) {
+  if (Array.isArray(move)) {
+    let notation = "";
+    for (let i=0; i<move.length; i++)
+      notation += move[i].notation + ",";
+    // Remove last comma:
+    return notation.slice(0,-1);
+  }
+  // Simple (usual) case
+  return move.notation;
+}
diff --git a/client/src/utils/playUndo.js b/client/src/utils/playUndo.js
new file mode 100644
index 00000000..ab11bff9
--- /dev/null
+++ b/client/src/utils/playUndo.js
@@ -0,0 +1,23 @@
+export function playMove(move, vr) {
+  if (!Array.isArray(move)) move = [move];
+  move.forEach(m => vr.play(m));
+}
+
+export function undoMove(move, vr) {
+  if (!Array.isArray(move)) move = [move];
+  for (let i = move.length - 1; i >= 0; i--)
+    vr.undo(move[i]);
+}
+
+export function getFilteredMove(move) {
+  if (!Array.isArray(move)) move = [move];
+  const filtered_move = move.map(m => {
+    return {
+      appear: m.appear,
+      vanish: m.vanish,
+      start: m.start,
+      end: m.end
+    };
+  });
+  return filtered_move.length == 1 ? filtered_move[0] : filtered_move;
+}
diff --git a/client/src/variants/Check3.js b/client/src/variants/Check3.js
index 63d5ae56..a4b292a4 100644
--- a/client/src/variants/Check3.js
+++ b/client/src/variants/Check3.js
@@ -1,20 +1,67 @@
 import { ChessRules } from "@/base_rules";
 
-export const VariantRules = class AntimatterRules extends ChessRules {
-  getPotentialMovesFrom([x, y]) {
-    let moves = super.getPotentialMovesFrom([x, y]);
-
-    // Handle "matter collisions"
-    moves.forEach(m => {
-      if (
-        m.vanish.length > 1 &&
-        m.appear.length <= 1 &&
-        m.vanish[0].p == m.vanish[1].p
-      ) {
-        m.appear.pop();
-      }
-    });
-
-    return moves;
+export const VariantRules = class Check3Rules extends ChessRules {
+  static IsGoodFlags(flags) {
+    // 4 for castle + 2 for checks (0,1 or 2)
+    return !!flags.match(/^[01]{4,4}[012]{2,2}$/);
+  }
+
+  setFlags(fenflags) {
+    super.setFlags(fenflags); //castleFlags
+    this.checkFlags = { w: 0, b: 0 };
+    const flags = fenflags.substr(4); //skip first 4 digits, for castle
+    for (let c of ["w", "b"]) {
+      this.checkFlags[c] = parseInt(flags.charAt(c == "w" ? 0 : 1));
+    }
+  }
+
+  aggregateFlags() {
+    return [this.castleFlags, this.checkFlags];
+  }
+
+  disaggregateFlags(flags) {
+    this.castleFlags = flags[0];
+    this.checkFlags = flags[1];
+  }
+
+  getPpath(b) {
+    if (b[1] == 'k' && this.checkFlags[b[0]] > 0)
+      return "Check3/" + b[0] + 'k_' + this.checkFlags[b[0]];
+    return b;
+  }
+
+  updateVariables(move) {
+    super.updateVariables(move);
+    // Does this move give check?
+    const oppCol = this.turn;
+    if (this.underCheck(oppCol))
+      this.checkFlags[oppCol]++;
+  }
+
+  getCurrentScore() {
+    const color = this.turn;
+    if (this.checkFlags[color] >= 3)
+      return color == "w" ? "0-1" : "1-0";
+    return super.getCurrentScore();
+  }
+
+  static GenRandInitFen() {
+    const randFen = ChessRules.GenRandInitFen();
+    // Add check flags (at 0)
+    return randFen.replace(" w 0 1111", " w 0 111100");
+  }
+
+  getFlagsFen() {
+    let fen = super.getFlagsFen();
+    // Add check flags
+    for (let c of ["w", "b"])
+      fen += this.checkFlags[c];
+    return fen;
+  }
+
+  evalPosition() {
+    const baseEval = super.evalPosition();
+    // Take number of checks into account
+    return baseEval/5 - this.checkFlags["w"] + this.checkFlags["b"];
   }
 };
diff --git a/client/src/variants/Hidden.js b/client/src/variants/Hidden.js
index 96822b93..c79267a5 100644
--- a/client/src/variants/Hidden.js
+++ b/client/src/variants/Hidden.js
@@ -61,6 +61,18 @@ export const VariantRules = class HiddenRules extends ChessRules {
     return piece;
   }
 
+  getPpath(b, color, score) {
+    if (Object.keys(V.HIDDEN_DECODE).includes(b[1])) {
+      // Supposed to be hidden.
+      if (score == "*" && (!color || color != b[0]))
+        return "Hidden/" + b[0] + "p";
+      // Else: condition OK to show the piece
+      return b[0] + V.HIDDEN_DECODE[b[1]];
+    }
+    // The piece is already not supposed to be hidden:
+    return b;
+  }
+
   // Scan board for kings positions (no castling)
   scanKingsRooks(fen) {
     this.kingPos = { w: [-1, -1], b: [-1, -1] };
@@ -87,18 +99,6 @@ export const VariantRules = class HiddenRules extends ChessRules {
     }
   }
 
-  getPpath(b, color, score) {
-    if (Object.keys(V.HIDDEN_DECODE).includes(b[1])) {
-      // Supposed to be hidden.
-      if (score == "*" && (!color || color != b[0]))
-        return "Hidden/" + b[0] + "p";
-      // Else: condition OK to show the piece
-      return b[0] + V.HIDDEN_DECODE[b[1]];
-    }
-    // The piece is already not supposed to be hidden:
-    return b;
-  }
-
   getBasicMove([sx, sy], [ex, ey], tr) {
     if (
       tr &&
diff --git a/client/src/variants/Marseille.js b/client/src/variants/Marseille.js
index 19d35a63..247e2cbe 100644
--- a/client/src/variants/Marseille.js
+++ b/client/src/variants/Marseille.js
@@ -3,10 +3,10 @@ import { randInt } from "@/utils/alea";
 
 export const VariantRules = class MarseilleRules extends ChessRules {
   static IsGoodEnpassant(enpassant) {
-    if (enpassant != "-") {
-      const squares = enpassant.split(",");
-      if (squares.length > 2) return false;
-      for (let sq of squares) {
+    const squares = enpassant.split(",");
+    if (squares.length > 2) return false;
+    for (let sq of squares) {
+      if (sq != "-") {
         const ep = V.SquareToCoords(sq);
         if (isNaN(ep.x) || !V.OnBoard(ep)) return false;
       }
@@ -20,25 +20,20 @@ export const VariantRules = class MarseilleRules extends ChessRules {
 
   // There may be 2 enPassant squares (if 2 pawns jump 2 squares in same turn)
   getEnpassantFen() {
-    const L = this.epSquares.length;
-    if (this.epSquares[L - 1].every(epsq => epsq === undefined)) return "-"; //no en-passant
-    let res = "";
-    this.epSquares[L - 1].forEach(epsq => {
-      if (epsq) res += V.CoordsToSquare(epsq) + ",";
-    });
-    return res.slice(0, -1); //remove last comma
+    return this.epSquares[this.epSquares.length - 1].map(
+      epsq => epsq === undefined
+        ? "-" //no en-passant
+        : V.CoordsToSquare(epsq)
+    ).join(",");
   }
 
   setOtherVariables(fen) {
     const parsedFen = V.ParseFen(fen);
     this.setFlags(parsedFen.flags);
-    if (parsedFen.enpassant == "-") this.epSquares = [[undefined]];
-    else {
-      let res = [];
-      const squares = parsedFen.enpassant.split(",");
-      for (let sq of squares) res.push(V.SquareToCoords(sq));
-      this.epSquares = [res];
-    }
+    this.epSquares = [parsedFen.enpassant.split(",").map(sq => {
+      if (sq != "-") return V.SquareToCoords(sq);
+      return undefined;
+    })];
     this.scanKingsRooks(fen);
     // Extract subTurn from turn indicator: "w" (first move), or
     // "w1" or "w2" white subturn 1 or 2, and same for black
@@ -166,8 +161,8 @@ export const VariantRules = class MarseilleRules extends ChessRules {
     V.UndoOnBoard(this.board, move);
     if (move.turn[1] == "0" || move.checkOnSubturn1 || this.subTurn == 2)
       this.epSquares.pop();
-    //this.subTurn == 1
     else {
+      // this.subTurn == 1
       let lastEpsq = this.epSquares[this.epSquares.length - 1];
       lastEpsq.pop();
     }
@@ -192,8 +187,6 @@ export const VariantRules = class MarseilleRules extends ChessRules {
 
   // No alpha-beta here, just adapted min-max at depth 2(+1)
   getComputerMove() {
-    if (this.subTurn == 2) return null; //TODO: imperfect interface setup
-
     const maxeval = V.INFINITY;
     const color = this.turn;
     const oppCol = V.GetOppCol(this.turn);
diff --git a/client/src/variants/Wormhole.js b/client/src/variants/Wormhole.js
index a6be9f2b..14766ff3 100644
--- a/client/src/variants/Wormhole.js
+++ b/client/src/variants/Wormhole.js
@@ -3,8 +3,20 @@ import { ArrayFun } from "@/utils/array";
 import { randInt } from "@/utils/alea";
 
 // TODO:
+// Short-range pieces:
+// rook 1 or 2 squares orthogonal
+// bishop 1 or 2 diagonal
+// queen = bishop + rook
+// knight: one square orthogonal + 1 diagonal (only acepted desc)
+// no castle or en passant. Promotion possible only by capture (otherwise hole)
 
 export const VariantRules = class WormholeRules extends ChessRules {
+  // TODO: redefine pieces movements, taking care of holes (auxiliary func: getSquareAfter(shiftX,shiftY))
+  // this aux func could return null / undefined
+  // revoir getPotentialMoves et isAttacked : tout ce qui touche au board avec calcul,
+  // car les "board[x+..][y+..]" deviennent des board[getSquareAfter...]
+  // Special FEN sign for holes: 'x'
+
   static get HasFlags() {
     return false;
   }
@@ -13,321 +25,37 @@ export const VariantRules = class WormholeRules extends ChessRules {
     return false;
   }
 
-  // Analyse in Hidden mode makes no sense
-  static get CanAnalyze() {
-    return false;
-  }
-
-  // Moves are revealed only when game ends
-  static get ShowMoves() {
-    return "none";
-  }
-
-  static get HIDDEN_DECODE() {
-    return {
-      s: "p",
-      t: "q",
-      u: "r",
-      c: "b",
-      o: "n",
-      l: "k"
-    };
-  }
-  static get HIDDEN_CODE() {
-    return {
-      p: "s",
-      q: "t",
-      r: "u",
-      b: "c",
-      n: "o",
-      k: "l"
-    };
-  }
-
-  // Turn a hidden piece or revealed piece into revealed piece:
-  static Decode(p) {
-    if (Object.keys(V.HIDDEN_DECODE).includes(p))
-      return V.HIDDEN_DECODE[p];
-    return p;
-  }
-
-  static get PIECES() {
-    return ChessRules.PIECES.concat(Object.values(V.HIDDEN_CODE));
+  getSquareAfter(sq, shift) {
+    // TODO
   }
 
-  // Pieces can be hidden :)
-  getPiece(i, j) {
-    const piece = this.board[i][j].charAt(1);
-    if (Object.keys(V.HIDDEN_DECODE).includes(piece))
-      return V.HIDDEN_DECODE[piece];
-    return piece;
-  }
-
-  // Scan board for kings positions (no castling)
-  scanKingsRooks(fen) {
-    this.kingPos = { w: [-1, -1], b: [-1, -1] };
-    const fenRows = V.ParseFen(fen).position.split("/");
-    for (let i = 0; i < fenRows.length; i++) {
-      let k = 0; //column index on board
-      for (let j = 0; j < fenRows[i].length; j++) {
-        switch (fenRows[i].charAt(j)) {
-          case "k":
-          case "l":
-            this.kingPos["b"] = [i, k];
-            break;
-          case "K":
-          case "L":
-            this.kingPos["w"] = [i, k];
-            break;
-          default: {
-            const num = parseInt(fenRows[i].charAt(j));
-            if (!isNaN(num)) k += num - 1;
-          }
-        }
-        k++;
-      }
-    }
-  }
-
-  getPpath(b, color, score) {
-    if (Object.keys(V.HIDDEN_DECODE).includes(b[1])) {
-      // Supposed to be hidden.
-      if (score == "*" && (!color || color != b[0]))
-        return "Hidden/" + b[0] + "p";
-      // Else: condition OK to show the piece
-      return b[0] + V.HIDDEN_DECODE[b[1]];
-    }
-    // The piece is already not supposed to be hidden:
+  getPpath(b) {
+    if (b.indexOf('x') >= 0)
+      return "Wormhole/hole.svg";
     return b;
   }
 
-  getBasicMove([sx, sy], [ex, ey], tr) {
-    if (
-      tr &&
-      Object.keys(V.HIDDEN_DECODE).includes(this.board[sx][sy].charAt(1))
-    ) {
-      // The transformed piece is a priori hidden
-      tr.p = V.HIDDEN_CODE[tr.p];
-    }
-    let mv = new Move({
-      appear: [
-        new PiPo({
-          x: ex,
-          y: ey,
-          c: tr ? tr.c : this.getColor(sx, sy),
-          p: tr ? tr.p : this.board[sx][sy].charAt(1)
-        })
-      ],
-      vanish: [
-        new PiPo({
-          x: sx,
-          y: sy,
-          c: this.getColor(sx, sy),
-          p: this.board[sx][sy].charAt(1)
-        })
-      ]
-    });
-
-    // The opponent piece disappears if we take it
-    if (this.board[ex][ey] != V.EMPTY) {
-      mv.vanish.push(
-        new PiPo({
-          x: ex,
-          y: ey,
-          c: this.getColor(ex, ey),
-          p: this.board[ex][ey].charAt(1)
-        })
-      );
-      // Pieces are revealed when they capture
-      mv.appear[0].p = V.Decode(mv.appear[0].p);
-    }
-
-    return mv;
-  }
-
-  // What are the king moves from square x,y ?
-  getPotentialKingMoves(sq) {
-    // No castling:
-    return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
-  }
-
-  filterValid(moves) {
-    return moves;
-  }
-
-  static GenRandInitFen() {
-    let pieces = { w: new Array(8), b: new Array(8) };
-    // Shuffle pieces + pawns on two first ranks
-    for (let c of ["w", "b"]) {
-      let positions = ArrayFun.range(16);
-
-      // Get random squares for bishops
-      let randIndex = 2 * randInt(8);
-      const bishop1Pos = positions[randIndex];
-      // The second bishop must be on a square of different color
-      let randIndex_tmp = 2 * randInt(8) + 1;
-      const bishop2Pos = positions[randIndex_tmp];
-      // Remove chosen squares
-      positions.splice(Math.max(randIndex, randIndex_tmp), 1);
-      positions.splice(Math.min(randIndex, randIndex_tmp), 1);
-
-      // Get random squares for knights
-      randIndex = randInt(14);
-      const knight1Pos = positions[randIndex];
-      positions.splice(randIndex, 1);
-      randIndex = randInt(13);
-      const knight2Pos = positions[randIndex];
-      positions.splice(randIndex, 1);
-
-      // Get random squares for rooks
-      randIndex = randInt(12);
-      const rook1Pos = positions[randIndex];
-      positions.splice(randIndex, 1);
-      randIndex = randInt(11);
-      const rook2Pos = positions[randIndex];
-      positions.splice(randIndex, 1);
-
-      // Get random square for queen
-      randIndex = randInt(10);
-      const queenPos = positions[randIndex];
-      positions.splice(randIndex, 1);
-
-      // Get random square for king
-      randIndex = randInt(9);
-      const kingPos = positions[randIndex];
-      positions.splice(randIndex, 1);
-
-      // Pawns position are all remaining slots:
-      for (let p of positions)
-        pieces[c][p] = "s";
-
-      // Finally put the shuffled pieces in the board array
-      pieces[c][rook1Pos] = "u";
-      pieces[c][knight1Pos] = "o";
-      pieces[c][bishop1Pos] = "c";
-      pieces[c][queenPos] = "t";
-      pieces[c][kingPos] = "l";
-      pieces[c][bishop2Pos] = "c";
-      pieces[c][knight2Pos] = "o";
-      pieces[c][rook2Pos] = "u";
-    }
-    let upFen = pieces["b"].join("");
-    upFen = upFen.substr(0,8) + "/" + upFen.substr(8).split("").reverse().join("");
-    let downFen = pieces["b"].join("").toUpperCase();
-    downFen = downFen.substr(0,8) + "/" + downFen.substr(8).split("").reverse().join("");
-    return upFen + "/8/8/8/8/" + downFen + " w 0";
-  }
-
-  getCheckSquares() {
-    return [];
-  }
+  // TODO: postUpdateVars: board[start] = "xx"; --> V.HOLE
 
   updateVariables(move) {
     super.updateVariables(move);
-    if (
-      move.vanish.length >= 2 &&
-      [V.KING,V.HIDDEN_CODE[V.KING]].includes(move.vanish[1].p)
-    ) {
-      // We took opponent king
-      this.kingPos[this.turn] = [-1, -1];
-    }
   }
 
   unupdateVariables(move) {
     super.unupdateVariables(move);
-    const c = move.vanish[0].c;
-    const oppCol = V.GetOppCol(c);
-    if (this.kingPos[oppCol][0] < 0)
-      // Last move took opponent's king:
-      this.kingPos[oppCol] = [move.vanish[1].x, move.vanish[1].y];
-  }
-
-  getCurrentScore() {
-    const color = this.turn;
-    const kp = this.kingPos[color];
-    if (kp[0] < 0)
-      // King disappeared
-      return color == "w" ? "0-1" : "1-0";
-    // Assume that stalemate is impossible:
-    return "*";
-  }
-
-  getComputerMove() {
-    const color = this.turn;
-    let moves = this.getAllValidMoves();
-    for (let move of moves) {
-      move.eval = 0; //a priori...
-
-      // Can I take something ? If yes, do it with some probability
-      if (move.vanish.length == 2 && move.vanish[1].c != color) {
-        // OK this isn't a castling move
-        const myPieceVal = V.VALUES[move.appear[0].p];
-        const hisPieceVal = Object.keys(V.HIDDEN_DECODE).includes(move.vanish[1].p)
-          ? undefined
-          : V.VALUES[move.vanish[1].p];
-        if (!hisPieceVal) {
-          // Opponent's piece is unknown: do not take too much risk
-          move.eval = -myPieceVal + 1.5; //so that pawns always take
-        }
-        // Favor captures
-        else if (myPieceVal <= hisPieceVal)
-          move.eval = hisPieceVal - myPieceVal + 1;
-        else {
-          // Taking a pawn with minor piece,
-          // or minor piece or pawn with a rook,
-          // or anything but a queen with a queen,
-          // or anything with a king.
-          move.eval = hisPieceVal - myPieceVal;
-        }
-      } else {
-        // If no capture, favor small step moves,
-        // but sometimes move the knight anyway
-        const penalty = V.Decode(move.vanish[0].p) != V.KNIGHT
-          ? Math.abs(move.end.x - move.start.x) + Math.abs(move.end.y - move.start.y)
-          : (Math.random() < 0.5 ? 3 : 1);
-        move.eval -= penalty / (V.size.x + V.size.y - 1);
-      }
-
-      // TODO: also favor movements toward the center?
-    }
-
-    moves.sort((a, b) => b.eval - a.eval);
-    let candidates = [0];
-    for (let j = 1; j < moves.length && moves[j].eval == moves[0].eval; j++)
-      candidates.push(j);
-    return moves[candidates[randInt(candidates.length)]];
   }
 
   getNotation(move) {
-    // Translate final square
-    const finalSquare = V.CoordsToSquare(move.end);
-
     const piece = this.getPiece(move.start.x, move.start.y);
-    if (piece == V.PAWN) {
-      // Pawn move
-      let notation = "";
-      if (move.vanish.length > move.appear.length) {
-        // Capture
-        const startColumn = V.CoordToColumn(move.start.y);
-        notation = startColumn + "x" + finalSquare;
-      }
-      else notation = finalSquare;
-      if (move.appear.length > 0 && !["p","s"].includes(move.appear[0].p)) {
-        // Promotion
-        const appearPiece = V.Decode(move.appear[0].p);
-        notation += "=" + appearPiece.toUpperCase();
-      }
-      return notation;
-    }
-    // Piece movement
-    return (
+    // Indicate start square + dest square, because holes distort the board
+    let notation =
       piece.toUpperCase() +
+      V.CoordsToSquare(move.start) +
       (move.vanish.length > move.appear.length ? "x" : "") +
-      finalSquare
-    );
+      V.CoordsToSquare(move.end);
+    if (piece == V.PAWN && move.appear[0].p != V.PAWN)
+      // Promotion
+      notation += "=" + move.appear[0].p.toUpperCase();
+    return notation;
   }
 };
diff --git a/client/src/views/Game.vue b/client/src/views/Game.vue
index 51e06340..f93b5b3a 100644
--- a/client/src/views/Game.vue
+++ b/client/src/views/Game.vue
@@ -58,7 +58,6 @@ main
   BaseGame(
     ref="basegame"
     :game="game"
-    :vr="vr"
     @newmove="processMove"
     @gameover="gameOver"
   )
@@ -73,6 +72,8 @@ import { ppt } from "@/utils/datetime";
 import { extractTime } from "@/utils/timeControl";
 import { getRandString } from "@/utils/alea";
 import { processModalClick } from "@/utils/modalClick";
+import { getFullNotation } from "@/utils/notation";
+import { playMove, getFilteredMove } from "@/utils/playUndo";
 import { getScoreMessage } from "@/utils/scoring";
 import params from "@/parameters";
 export default {
@@ -321,20 +322,24 @@ export default {
         case "lastate": //got opponent infos about last move
           this.lastate = data.data;
           if (this.game.rendered)
-            //game is rendered (Board component)
+            // Game is rendered (Board component)
             this.processLastate();
-          //else: will be processed when game is ready
+          // Else: will be processed when game is ready
           break;
         case "newmove": {
           const move = data.data;
           if (move.cancelDrawOffer) {
-            //opponent refuses draw
+            // Opponent refuses draw
             this.drawOffer = "";
             // NOTE for corr games: drawOffer reset by player in turn
             if (this.game.type == "live" && !!this.game.mycolor)
               GameStorage.update(this.gameRef.id, { drawOffer: "" });
           }
-          this.$refs["basegame"].play(move, "received");
+          this.$refs["basegame"].play(
+            move.move,
+            "received",
+            null,
+            {addTime:move.addTime});
           break;
         }
         case "resign":
@@ -372,8 +377,10 @@ export default {
       if (data.movesCount > L) {
         // Just got last move from him
         this.$refs["basegame"].play(
-          Object.assign({ initime: data.initime }, data.lastMove)
-        );
+          data.lastMove.move,
+          "received",
+          null,
+          {addTime:data.lastMove.addTime, initime:data.initime});
       }
       if (data.drawSent) this.drawOffer = "received";
       if (data.score != "*") {
@@ -392,7 +399,7 @@ export default {
         this.send("draw", { data: message });
         this.gameOver("1/2", message);
       } else if (this.drawOffer == "") {
-        //no effect if drawOffer == "sent"
+        // No effect if drawOffer == "sent"
         if (this.game.mycolor != this.vr.turn) {
           alert(this.st.tr["Draw offer only in your turn"]);
           return;
@@ -444,10 +451,10 @@ export default {
           // NOTE: clocks in seconds, initime in milliseconds
           game.clocks = [tc.mainTime, tc.mainTime];
           game.moves.sort((m1, m2) => m1.idx - m2.idx); //in case of
+          const L = game.moves.length;
           if (game.score == "*") {
-            //otherwise no need to bother with time
+            // Set clocks + initime
             game.initime = [0, 0];
-            const L = game.moves.length;
             if (L >= 3) {
               let addTime = [0, 0];
               for (let i = 2; i < L; i++) {
@@ -465,16 +472,16 @@ export default {
           });
           if (myIdx >= 0 && game.score == "*" && game.chats.length > 0) {
             // Did a chat message arrive after my last move?
-            let vr_tmp = new V(game.fen); //start from last position
-            const flags = V.ParseFen(game.fen).flags; //may be undefined
             let dtLastMove = 0;
-            for (let midx = game.moves.length - 1; midx >= 0; midx--) {
-              // NOTE: flags could be wrong, but since our only concern is turn,
-              // this should be enough. (TODO?)
-              vr_tmp.undo(Object.assign({flags:JSON.stringify(flags)}, game.moves[midx].squares));
-              if (vr_tmp.turn == mycolor) {
-                dtLastMove = game.moves[midx].played;
-                break;
+            if (L == 1 && myIdx == 0)
+              dtLastMove = game.moves[0].played;
+            else if (L >= 2) {
+              if (L % 2 == 0) {
+                // It's now white turn
+                dtLastMove = game.moves[L-1-(1-myIdx)].played;
+              } else {
+                // Black turn:
+                dtLastMove = game.moves[L-1-myIdx].played;
               }
             }
             if (dtLastMove < game.chats[0].added)
@@ -517,30 +524,17 @@ export default {
         }
         this.repeat = {}; //reset: scan past moves' FEN:
         let repIdx = 0;
-        // NOTE: vr_tmp to obtain FEN strings is redundant with BaseGame
         let vr_tmp = new V(game.fenStart);
-        let movesCount = -1;
         let curTurn = "n";
         game.moves.forEach(m => {
-          if (vr_tmp.turn != curTurn)
-          {
-            movesCount++;
-            curTurn = vr_tmp.turn;
-          }
-          vr_tmp.play(m);
-          const fenObj = V.ParseFen(vr_tmp.getFen());
-          repIdx = fenObj.position + "_" + fenObj.turn;
-          if (fenObj.flags) repIdx += "_" + fenObj.flags;
-          this.repeat[repIdx] = this.repeat[repIdx]
-            ? this.repeat[repIdx] + 1
+          playMove(m, vr_tmp);
+          const fenIdx = vr_tmp.getFen().replace(/ /g, "_");
+          this.repeat[fenIdx] = this.repeat[fenIdx]
+            ? this.repeat[fenIdx] + 1
             : 1;
         });
-        if (vr_tmp.turn != curTurn)
-          movesCount++;
         if (this.repeat[repIdx] >= 3) this.drawOffer = "threerep";
         this.game = Object.assign(
-          {},
-          game,
           // NOTE: assign mycolor here, since BaseGame could also be VS computer
           {
             type: gtype,
@@ -550,8 +544,9 @@ export default {
             // at least oppsid or oppid is available anyway:
             oppsid: myIdx < 0 ? undefined : game.players[1 - myIdx].sid,
             oppid: myIdx < 0 ? undefined : game.players[1 - myIdx].uid,
-            movesCount: movesCount,
-          }
+            movesCount: game.moves.length
+          },
+          game,
         );
         this.re_setClocks();
         this.$nextTick(() => {
@@ -612,110 +607,111 @@ export default {
       }, 1000);
     },
     // Post-process a (potentially partial) move (which was just played in BaseGame)
-    processMove: function(move) {
-      if (this.game.type == "corr" && move.color == this.game.mycolor) {
-        if (
-          !confirm(
-            this.st.tr["Move played:"] +
-              " " +
-              move.notation +
-              "\n" +
-              this.st.tr["Are you sure?"]
-          )
-        ) {
-          this.$refs["basegame"].undo(move);
-          return;
+    processMove: function(move, data) {
+      const moveCol = this.vr.turn;
+      const doProcessMove = () => {
+        const colorIdx = ["w", "b"].indexOf(moveCol);
+        const nextIdx = 1 - colorIdx;
+        if (this.game.mycolor) {
+          // NOTE: 'var' to see that variable outside this block
+          var filtered_move = getFilteredMove(move);
         }
-      }
-      const colorIdx = ["w", "b"].indexOf(move.color);
-      const nextIdx = ["w", "b"].indexOf(this.vr.turn);
-      // https://stackoverflow.com/a/38750895
-      if (this.game.mycolor) {
-        const allowed_fields = ["appear", "vanish", "start", "end"];
-        // NOTE: 'var' to see that variable outside this block
-        var filtered_move = Object.keys(move)
-          .filter(key => allowed_fields.includes(key))
-          .reduce((obj, key) => {
-            obj[key] = move[key];
-            return obj;
-          }, {});
-      }
-      // Send move ("newmove" event) to people in the room (if our turn)
-      let addTime = 0;
-      if (move.color == this.game.mycolor) {
-        if (this.drawOffer == "received")
-          // I refuse draw
-          this.drawOffer = "";
-        if (this.game.movesCount >= 2) {
-          const elapsed = Date.now() - this.game.initime[colorIdx];
-          // elapsed time is measured in milliseconds
-          addTime = this.game.increment - elapsed / 1000;
+        // Send move ("newmove" event) to people in the room (if our turn)
+        let addTime = data ? data.addTime : 0;
+        if (moveCol == this.game.mycolor) {
+          if (this.drawOffer == "received")
+            // I refuse draw
+            this.drawOffer = "";
+          if (this.game.movesCount >= 2) {
+            const elapsed = Date.now() - this.game.initime[colorIdx];
+            // elapsed time is measured in milliseconds
+            addTime = this.game.increment - elapsed / 1000;
+          }
+          const sendMove = {
+            move: filtered_move,
+            addTime: addTime,
+            cancelDrawOffer: this.drawOffer == ""
+          };
+          this.send("newmove", { data: sendMove });
         }
-        const sendMove = Object.assign({}, filtered_move, {
-          addTime: addTime,
-          cancelDrawOffer: this.drawOffer == ""
-        });
-        this.send("newmove", { data: sendMove });
-        // (Add)Time indication: useful in case of lastate infos requested
-        move.addTime = addTime;
-      } else addTime = move.addTime; //supposed transmitted
-      // Update current game object:
-      if (nextIdx != colorIdx)
+        // Update current game object (no need for moves stack):
+        playMove(move, this.vr);
         this.game.movesCount++;
-      this.game.moves.push(move);
-      this.game.fen = move.fen;
-      this.game.clocks[colorIdx] += addTime;
-      // move.initime is set only when I receive a "lastate" move from opponent
-      this.game.initime[nextIdx] = move.initime || Date.now();
-      this.re_setClocks();
-      // If repetition detected, consider that a draw offer was received:
-      const fenObj = V.ParseFen(move.fen);
-      let repIdx = fenObj.position + "_" + fenObj.turn;
-      if (fenObj.flags) repIdx += "_" + fenObj.flags;
-      this.repeat[repIdx] = this.repeat[repIdx] ? this.repeat[repIdx] + 1 : 1;
-      if (this.repeat[repIdx] >= 3) this.drawOffer = "threerep";
-      else if (this.drawOffer == "threerep") this.drawOffer = "";
-      // Since corr games are stored at only one location, update should be
-      // done only by one player for each move:
-      if (
-        this.game.mycolor &&
-        (this.game.type == "live" || move.color == this.game.mycolor)
-      ) {
-        let drawCode = "";
-        switch (this.drawOffer) {
-          case "threerep":
-            drawCode = "t";
-            break;
-          case "sent":
-            drawCode = this.game.mycolor;
-            break;
-          case "received":
-            drawCode = this.vr.turn;
-            break;
-        }
-        if (this.game.type == "corr") {
-          GameStorage.update(this.gameRef.id, {
-            fen: move.fen,
-            move: {
-              squares: filtered_move,
-              played: Date.now(),
-              idx: this.game.moves.length - 1
-            },
-            // Code "n" for "None" to force reset (otherwise it's ignored)
-            drawOffer: drawCode || "n"
-          });
-        }
-        else {
-          // Live game:
-          GameStorage.update(this.gameRef.id, {
-            fen: move.fen,
-            move: filtered_move,
-            clocks: this.game.clocks,
-            initime: this.game.initime,
-            drawOffer: drawCode
-          });
+        // (add)Time indication: useful in case of lastate infos requested
+        this.game.moves.push({move:move, addTime:addTime});
+        this.game.fen = this.vr.getFen();
+        this.game.clocks[colorIdx] += addTime;
+        // data.initime is set only when I receive a "lastate" move from opponent
+        this.game.initime[nextIdx] = (data && data.initime) ? data.initime : Date.now();
+        this.re_setClocks();
+        // If repetition detected, consider that a draw offer was received:
+        const fenObj = V.ParseFen(this.game.fen);
+        let repIdx = fenObj.position + "_" + fenObj.turn;
+        if (fenObj.flags) repIdx += "_" + fenObj.flags;
+        this.repeat[repIdx] = this.repeat[repIdx] ? this.repeat[repIdx] + 1 : 1;
+        if (this.repeat[repIdx] >= 3) this.drawOffer = "threerep";
+        else if (this.drawOffer == "threerep") this.drawOffer = "";
+        // Since corr games are stored at only one location, update should be
+        // done only by one player for each move:
+        if (
+          this.game.mycolor &&
+          (this.game.type == "live" || moveCol == this.game.mycolor)
+        ) {
+          let drawCode = "";
+          switch (this.drawOffer) {
+            case "threerep":
+              drawCode = "t";
+              break;
+            case "sent":
+              drawCode = this.game.mycolor;
+              break;
+            case "received":
+              drawCode = V.GetOppCol(this.game.mycolor);
+              break;
+          }
+          if (this.game.type == "corr") {
+            GameStorage.update(this.gameRef.id, {
+              fen: this.game.fen,
+              move: {
+                squares: filtered_move,
+                played: Date.now(),
+                idx: this.game.moves.length - 1
+              },
+              // Code "n" for "None" to force reset (otherwise it's ignored)
+              drawOffer: drawCode || "n"
+            });
+          }
+          else {
+            // Live game:
+            GameStorage.update(this.gameRef.id, {
+              fen: this.game.fen,
+              move: filtered_move,
+              clocks: this.game.clocks,
+              initime: this.game.initime,
+              drawOffer: drawCode
+            });
+          }
         }
+      };
+      if (this.game.type == "corr" && moveCol == this.game.mycolor) {
+        setTimeout(() => {
+          if (
+            !confirm(
+              this.st.tr["Move played:"] +
+                " " +
+                getFullNotation(move) +
+                "\n" +
+                this.st.tr["Are you sure?"]
+            )
+          ) {
+            this.$refs["basegame"].cancelLastMove();
+            return;
+          }
+          doProcessMove();
+        // Let small time to finish drawing current move attempt:
+        }, 500);
       }
+      else doProcessMove();
     },
     resetChatColor: function() {
       // TODO: this is called twice, once on opening an once on closing
diff --git a/client/src/views/Problems.vue b/client/src/views/Problems.vue
index 30d3356d..2d6ac692 100644
--- a/client/src/views/Problems.vue
+++ b/client/src/views/Problems.vue
@@ -99,7 +99,6 @@ main
   BaseGame(
     v-if="showOne"
     :game="game"
-    :vr="vr"
   )
 </template>
 
@@ -139,7 +138,6 @@ export default {
       onlyMines: false,
       showOne: false,
       infoMsg: "",
-      vr: null, //"variant rules" object initialized from FEN
       game: {
         players: [{ name: "Problem" }, { name: "Problem" }],
         mode: "analyze"
@@ -280,9 +278,8 @@ export default {
     showProblem: function(p) {
       this.loadVariant(p.vid, () => {
         // The FEN is already checked at this stage:
-        this.vr = new V(p.fen);
         this.game.vname = p.vname;
-        this.game.mycolor = this.vr.turn; //diagram orientation
+        this.game.mycolor = V.ParseFen(p.fen).turn; //diagram orientation
         this.game.fen = p.fen;
         this.$set(this.game, "fenStart", p.fen);
         this.copyProblem(p, this.curproblem);