Start Ambiguous

diff --git a/variants/Ambiguous/class.js b/variants/Ambiguous/class.js
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+import ChessRules from "/base_rules.js";
+import { randInt, shuffle } from "@/utils/alea";
+import { ArrayFun } from "@/utils/array";
+
+export default class AmbiguousRules extends ChessRules {
+
+  // TODO: options
+
+  get hasFlags() {
+    return false;
+  }
+
+  setOtherVariables(fenParsed) {
+    super.setOtherVariables(fenParsed);
+    if (this.movesCount == 0)
+      this.subTurn = 2;
+    else
+      this.subTurn = 1;
+  }
+
+  genRandInitFen(seed) {
+    const gr = new GiveawayRules(
+      {mode: "suicide", options: this.options, genFenOnly: true});
+    return gr.genRandInitFen(seed);
+  }
+
+  // Subturn 1: play a move for the opponent on the designated square.
+  // Subturn 2: play a move for me (which just indicate a square).
+  getPotentialMovesFrom([x, y]) {
+    const color = this.turn;
+    const oppCol = V.GetOppCol(color);
+    if (this.subTurn == 2) {
+      // Just play a normal move (which in fact only indicate a square)
+      let movesHash = {};
+      return (
+        super.getPotentialMovesFrom([x, y])
+        .filter(m => {
+          // Filter promotions: keep only one, since no choice now.
+          if (m.appear[0].p != m.vanish[0].p) {
+            const hash = V.CoordsToSquare(m.start) + V.CoordsToSquare(m.end);
+            if (!movesHash[hash]) {
+              movesHash[hash] = true;
+              return true;
+            }
+            return false;
+          }
+          return true;
+        })
+        .map(m => {
+          if (m.vanish.length == 1) m.appear[0].p = V.GOAL;
+          else m.appear[0].p = V.TARGET_CODE[m.vanish[1].p];
+          m.appear[0].c = oppCol;
+          m.vanish.shift();
+          return m;
+        })
+      );
+    }
+    // At subTurn == 1, play a targeted move for opponent
+    // Search for target (we could also have it in a stack...)
+    let target = { x: -1, y: -1 };
+    outerLoop: for (let i = 0; i < V.size.x; i++) {
+      for (let j = 0; j < V.size.y; j++) {
+        if (this.board[i][j] != V.EMPTY) {
+          const piece = this.board[i][j][1];
+          if (
+            piece == V.GOAL ||
+            Object.keys(V.TARGET_DECODE).includes(piece)
+          ) {
+            target = { x: i, y: j};
+            break outerLoop;
+          }
+        }
+      }
+    }
+    // TODO: could be more efficient than generating all moves.
+    this.turn = oppCol;
+    const emptyTarget = (this.board[target.x][target.y][1] == V.GOAL);
+    if (emptyTarget) this.board[target.x][target.y] = V.EMPTY;
+    let moves = super.getPotentialMovesFrom([x, y]);
+    if (emptyTarget) {
+      this.board[target.x][target.y] = color + V.GOAL;
+      moves.forEach(m => {
+        m.vanish.push({
+          x: target.x,
+          y: target.y,
+          c: color,
+          p: V.GOAL
+        });
+      });
+    }
+    this.turn = color;
+    return moves.filter(m => m.end.x == target.x && m.end.y == target.y);
+  }
+
+  canIplay(x, y) {
+    const color = this.getColor(x, y);
+    return (
+      (this.subTurn == 1 && ![this.turn, this.playerColor].includes(color)) ||
+      (this.subTurn == 2 && super.canIplay(x, y))
+    );
+  }
+
+  // Code for empty square target
+  static get GOAL() {
+    return 'g';
+  }
+
+  static get TARGET_DECODE() {
+    return {
+      's': 'p',
+      't': 'q',
+      'u': 'r',
+      'o': 'n',
+      'c': 'b',
+      'l': 'k'
+    };
+  }
+
+  static get TARGET_CODE() {
+    return {
+      'p': 's',
+      'q': 't',
+      'r': 'u',
+      'n': 'o',
+      'b': 'c',
+      'k': 'l'
+    };
+  }
+
+  pieces() {
+    // .........
+  }
+
+  atLeastOneMove() {
+    // Since there are no checks this seems true (same as for Magnetic...)
+    return true;
+  }
+
+  filterValid(moves) {
+    return moves;
+  }
+
+  getCurrentScore() {
+    // This function is only called at subTurn 1
+    const color = V.GetOppCol(this.turn);
+    if (this.kingPos[color][0] < 0) return (color == 'w' ? "0-1" : "1-0");
+    return "*";
+  }
+
+  play(move) {
+    let kingCaptured = false;
+    if (this.subTurn == 1) {
+      this.prePlay(move);
+      this.epSquares.push(this.getEpSquare(move));
+      kingCaptured = this.kingPos[this.turn][0] < 0;
+    }
+    if (kingCaptured) move.kingCaptured = true;
+    V.PlayOnBoard(this.board, move);
+    if (this.subTurn == 2 || kingCaptured) {
+      this.turn = V.GetOppCol(this.turn);
+      this.movesCount++;
+    }
+    if (!kingCaptured) this.subTurn = 3 - this.subTurn;
+  }
+
+};