From 1269441e90bb8437bc63cc6cca63ca050f1e2aae Mon Sep 17 00:00:00 2001
From: Benjamin Auder <benjamin.auder@somewhere>
Date: Sun, 13 Dec 2020 02:49:08 +0100
Subject: [PATCH] Almost completed Empire Chess. Next is Synochess (+ rules
 translations)

---
 client/public/images/pieces/Empire/wc.svg     |  96 ++++
 client/public/images/pieces/Empire/wd.svg     | 115 +++++
 client/public/images/pieces/Empire/we.svg     | 118 +++++
 client/public/images/pieces/Empire/wk.svg     | 127 +++++
 client/public/images/pieces/Empire/wp.svg     |  95 ++++
 client/public/images/pieces/Empire/wq.svg     |  99 ++++
 client/public/images/pieces/Empire/ws.svg     |  88 ++++
 client/public/images/pieces/Empire/wt.svg     | 125 +++++
 client/public/variants/Empire/Board.png       |   1 +
 client/public/variants/Empire/EagleMoves.png  |   1 +
 client/src/translations/rules/Empire/en.pug   | 118 +++++
 client/src/translations/rules/Empire/es.pug   |   1 +
 client/src/translations/rules/Empire/fr.pug   |   1 +
 .../src/translations/rules/Synochess/en.pug   |   1 +
 .../src/translations/rules/Synochess/es.pug   |   1 +
 .../src/translations/rules/Synochess/fr.pug   |   1 +
 client/src/variants/Empire.js                 | 436 ++++++++++++++++++
 client/src/variants/Minixiangqi.js            |   4 +
 client/src/variants/Orda.js                   |  77 +---
 client/src/variants/Synochess.js              |   7 +
 client/src/variants/Xiangqi.js                |  17 +-
 21 files changed, 1448 insertions(+), 81 deletions(-)
 create mode 100644 client/public/images/pieces/Empire/wc.svg
 create mode 100644 client/public/images/pieces/Empire/wd.svg
 create mode 100644 client/public/images/pieces/Empire/we.svg
 create mode 100644 client/public/images/pieces/Empire/wk.svg
 create mode 100644 client/public/images/pieces/Empire/wp.svg
 create mode 100644 client/public/images/pieces/Empire/wq.svg
 create mode 100644 client/public/images/pieces/Empire/ws.svg
 create mode 100644 client/public/images/pieces/Empire/wt.svg
 create mode 100644 client/public/variants/Empire/Board.png
 create mode 100644 client/public/variants/Empire/EagleMoves.png
 create mode 100644 client/src/translations/rules/Empire/en.pug
 create mode 100644 client/src/translations/rules/Empire/es.pug
 create mode 100644 client/src/translations/rules/Empire/fr.pug
 create mode 100644 client/src/translations/rules/Synochess/en.pug
 create mode 100644 client/src/translations/rules/Synochess/es.pug
 create mode 100644 client/src/translations/rules/Synochess/fr.pug
 create mode 100644 client/src/variants/Empire.js
 create mode 100644 client/src/variants/Synochess.js

diff --git a/client/public/images/pieces/Empire/wc.svg b/client/public/images/pieces/Empire/wc.svg
new file mode 100644
index 00000000..74ce101d
--- /dev/null
+++ b/client/public/images/pieces/Empire/wc.svg
@@ -0,0 +1,96 @@
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diff --git a/client/public/images/pieces/Empire/wd.svg b/client/public/images/pieces/Empire/wd.svg
new file mode 100644
index 00000000..d6b8d8b7
--- /dev/null
+++ b/client/public/images/pieces/Empire/wd.svg
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diff --git a/client/public/images/pieces/Empire/we.svg b/client/public/images/pieces/Empire/we.svg
new file mode 100644
index 00000000..5a977168
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diff --git a/client/public/variants/Empire/Board.png b/client/public/variants/Empire/Board.png
new file mode 100644
index 00000000..efbfec85
--- /dev/null
+++ b/client/public/variants/Empire/Board.png
@@ -0,0 +1 @@
+#$# git-fat 759292776cfaf7e3ed788fe32d14b99c138fb211                34156
diff --git a/client/public/variants/Empire/EagleMoves.png b/client/public/variants/Empire/EagleMoves.png
new file mode 100644
index 00000000..0f264b92
--- /dev/null
+++ b/client/public/variants/Empire/EagleMoves.png
@@ -0,0 +1 @@
+#$# git-fat 471867cda344bda2feee24069e7eb8f1af3029c3                15689
diff --git a/client/src/translations/rules/Empire/en.pug b/client/src/translations/rules/Empire/en.pug
new file mode 100644
index 00000000..d0fbaa6a
--- /dev/null
+++ b/client/src/translations/rules/Empire/en.pug
@@ -0,0 +1,118 @@
+p.boxed
+  | The player in first has a different set of pieces,
+  | moving generally like a queen but capturing (almost) as usual.
+
+figure
+  img.img-center(src="/variants/Empire/Board.png")
+  figcaption.text-center Initial deterministic setup.
+
+p.
+  Empire Chess is a chess variant designed in 2020 by Couch Tomato, the third
+  asymmetric game. This game pits the army of the "Empire" (gold) against the
+  original chess army (the "Kingdom", black). The Empire's unique feature is
+  that its pieces move like queens but attack differently.
+
+h3 General Rules
+
+ol
+  li The Empire (gold) always moves first.
+  li The Empire cannot castle.
+  li.
+    As the Empire's pawns start on the third rank, they do not have the
+    option to move two spaces or be captured by en passant. Kingdom pawns
+    retain the ability to move two spaces initially and to be captured via
+    en passant.
+  li Pawns on either side can only promote to a queen.
+  li.
+    An additional method of victory is available: called campmate.
+    Campmate is achieved by moving one's king into the final rank
+    without being check.
+  li Stalemate and repetition are both losses.
+  li.
+    Facing kings &mdash; The King and Kaiser (Imperial King) may not face
+    each other on a file or rank, similar to Xiangqi.
+
+h3 Imperial Pieces
+
+p.
+  There are five new units unique to the Empire: 2 Siege Towers, 2 Eagles,
+  2 Cardinals, 1 Duke, and 2 Soldiers. The bottom rank are all stronger than
+  their Kingdom counterparts with the exception of the Duke.
+
+ul
+  li.
+    Kaiser (K) &mdash; The Imperial king is called the Kaiser and has a
+    different symbol, but is essentially the same as the Kingdom's King,
+    also using the same abbreviation (K) &mdash; the change is purely
+    aesthetic and thematic.
+  li.
+    Soldier (S) &mdash; The Soldiers are the two pawn-like pieces replacing
+    the two middle pawns. These act like promoted soldiers in Xiangqi and
+    can move one square orthogonally in any direction except backwards.
+
+p.
+  The remaining pieces are divergent pieces, pieces that move differently
+  than they attack (such as pawns). Imperial pieces all move as queens,
+  but attack like their Kingdom counterpart except for the Duke.
+
+ul
+  li.
+    Siege Tower (T) &mdash; The Siege Tower, or Tower for short, moves like a
+    Queen but attacks like a Rook.
+  li Eagle (E) &mdash; The Eagle moves like a Queen but attacks like a Knight.
+  li.
+    Cardinal (C) &mdash; The Cardinal moves like a Queen
+    but attacks like a Bishop.
+  li Duke (D) &mdash; The Duke moves like a Queen but attacks like a King.
+
+figure
+  img.img-center(src="/variants/Empire/EagleMoves.png")
+  figcaption.text-center Eagle's moves (green) & captures (red).
+
+h3 Piece valuation
+
+p The following simplified values are used by the bot:
+
+table
+  tr
+    th Kingdom piece
+    th Value
+    th Imperial piece
+    th Value
+  tr
+    td Pawn
+    td 1
+    td Pawn
+    td 1
+  tr
+    td Queen
+    td 9
+    td Duke
+    td 4
+  tr
+    td Bishop
+    td 3
+    td Cardinal
+    td 4
+  tr
+    td Knight
+    td 3
+    td Eagle
+    td 7
+  tr
+    td Rook
+    td 5
+    td Siege Tower
+    td 7
+  tr
+    td Soldier
+    td 2
+    td -
+    td -
+
+h3 More information
+
+p
+  | See 
+  a(href="https://www.pychess.org/variant/empirechess") Empire Chess
+  | &nbsp;on pychess-variants, where you can also play this variant.
diff --git a/client/src/translations/rules/Empire/es.pug b/client/src/translations/rules/Empire/es.pug
new file mode 100644
index 00000000..21203baa
--- /dev/null
+++ b/client/src/translations/rules/Empire/es.pug
@@ -0,0 +1 @@
+p.boxed TODO
diff --git a/client/src/translations/rules/Empire/fr.pug b/client/src/translations/rules/Empire/fr.pug
new file mode 100644
index 00000000..21203baa
--- /dev/null
+++ b/client/src/translations/rules/Empire/fr.pug
@@ -0,0 +1 @@
+p.boxed TODO
diff --git a/client/src/translations/rules/Synochess/en.pug b/client/src/translations/rules/Synochess/en.pug
new file mode 100644
index 00000000..21203baa
--- /dev/null
+++ b/client/src/translations/rules/Synochess/en.pug
@@ -0,0 +1 @@
+p.boxed TODO
diff --git a/client/src/translations/rules/Synochess/es.pug b/client/src/translations/rules/Synochess/es.pug
new file mode 100644
index 00000000..21203baa
--- /dev/null
+++ b/client/src/translations/rules/Synochess/es.pug
@@ -0,0 +1 @@
+p.boxed TODO
diff --git a/client/src/translations/rules/Synochess/fr.pug b/client/src/translations/rules/Synochess/fr.pug
new file mode 100644
index 00000000..21203baa
--- /dev/null
+++ b/client/src/translations/rules/Synochess/fr.pug
@@ -0,0 +1 @@
+p.boxed TODO
diff --git a/client/src/variants/Empire.js b/client/src/variants/Empire.js
new file mode 100644
index 00000000..2ce84930
--- /dev/null
+++ b/client/src/variants/Empire.js
@@ -0,0 +1,436 @@
+import { ChessRules } from "@/base_rules";
+
+export class EmpireRules extends ChessRules {
+
+  static get PawnSpecs() {
+    return Object.assign(
+      {},
+      ChessRules.PawnSpecs,
+      { promotions: [V.QUEEN] }
+    );
+  }
+
+  static get LoseOnRepetition() {
+    return true;
+  }
+
+  static IsGoodFlags(flags) {
+    // Only black can castle
+    return !!flags.match(/^[a-z]{2,2}$/);
+  }
+
+  getPpath(b) {
+    return (b[0] == 'w' ? "Empire/" : "") + b;
+  }
+
+  static GenRandInitFen(randomness) {
+    if (randomness == 0)
+      return "rnbqkbnr/pppppppp/8/8/8/PPPSSPPP/8/TECDKCET w 0 ah -";
+
+    // Mapping kingdom --> empire:
+    const piecesMap = {
+      'R': 'T',
+      'N': 'E',
+      'B': 'C',
+      'Q': 'D',
+      'K': 'K'
+    };
+
+    const baseFen = ChessRules.GenRandInitFen(randomness);
+    return (
+      baseFen.substr(0, 24) + "PPPSSPPP/8/" +
+      baseFen.substr(35, 8).split('').map(p => piecesMap[p]).join('') +
+      baseFen.substr(43, 5) + baseFen.substr(50)
+    );
+  }
+
+  getFlagsFen() {
+    return this.castleFlags['b'].map(V.CoordToColumn).join("");
+  }
+
+  setFlags(fenflags) {
+    this.castleFlags = { 'b': [-1, -1] };
+    for (let i = 0; i < 2; i++)
+      this.castleFlags['b'][i] = V.ColumnToCoord(fenflags.charAt(i));
+  }
+
+  static get TOWER() {
+    return 't';
+  }
+  static get EAGLE() {
+    return 'e';
+  }
+  static get CARDINAL() {
+    return 'c';
+  }
+  static get DUKE() {
+    return 'd';
+  }
+  static get SOLDIER() {
+    return 's';
+  }
+  // Kaiser is technically a King, so let's keep things simple.
+
+  static get PIECES() {
+    return ChessRules.PIECES.concat(
+      [V.TOWER, V.EAGLE, V.CARDINAL, V.DUKE, V.SOLDIER]);
+  }
+
+  getPotentialMovesFrom(sq) {
+    let moves = [];
+    const piece = this.getPiece(sq[0], sq[1]);
+    switch (piece) {
+      case V.TOWER:
+        moves = this.getPotentialTowerMoves(sq);
+        break;
+      case V.EAGLE:
+        moves = this.getPotentialEagleMoves(sq);
+        break;
+      case V.CARDINAL:
+        moves = this.getPotentialCardinalMoves(sq);
+        break;
+      case V.DUKE:
+        moves = this.getPotentialDukeMoves(sq);
+        break;
+      case V.SOLDIER:
+        moves = this.getPotentialSoldierMoves(sq);
+        break;
+      default:
+        moves = super.getPotentialMovesFrom(sq);
+    }
+    if (
+      piece != V.KING &&
+      this.kingPos['w'][0] != this.kingPos['b'][0] &&
+      this.kingPos['w'][1] != this.kingPos['b'][1]
+    ) {
+      return moves;
+    }
+    // TODO: factor two next "if" into one (rank/column...)
+    if (this.kingPos['w'][1] == this.kingPos['b'][1]) {
+      const colKing = this.kingPos['w'][1];
+      let intercept = 0; //count intercepting pieces
+      let [kingPos1, kingPos2] = [this.kingPos['w'][0], this.kingPos['b'][0]];
+      if (kingPos1 > kingPos2) [kingPos1, kingPos2] = [kingPos2, kingPos1];
+      for (let i = kingPos1 + 1; i < kingPos2; i++) {
+        if (this.board[i][colKing] != V.EMPTY) intercept++;
+      }
+      if (intercept >= 2) return moves;
+      // intercept == 1 (0 is impossible):
+      // Any move not removing intercept is OK
+      return moves.filter(m => {
+        return (
+          // From another column?
+          m.start.y != colKing ||
+          // From behind a king? (including kings themselves!)
+          m.start.x <= kingPos1 ||
+          m.start.x >= kingPos2 ||
+          // Intercept piece moving: must remain in-between
+          (
+            m.end.y == colKing &&
+            m.end.x > kingPos1 &&
+            m.end.x < kingPos2
+          )
+        );
+      });
+    }
+    if (this.kingPos['w'][0] == this.kingPos['b'][0]) {
+      const rowKing = this.kingPos['w'][0];
+      let intercept = 0; //count intercepting pieces
+      let [kingPos1, kingPos2] = [this.kingPos['w'][1], this.kingPos['b'][1]];
+      if (kingPos1 > kingPos2) [kingPos1, kingPos2] = [kingPos2, kingPos1];
+      for (let i = kingPos1 + 1; i < kingPos2; i++) {
+        if (this.board[rowKing][i] != V.EMPTY) intercept++;
+      }
+      if (intercept >= 2) return moves;
+      // intercept == 1 (0 is impossible):
+      // Any move not removing intercept is OK
+      return moves.filter(m => {
+        return (
+          // From another row?
+          m.start.x != rowKing ||
+          // From "behind" a king? (including kings themselves!)
+          m.start.y <= kingPos1 ||
+          m.start.y >= kingPos2 ||
+          // Intercept piece moving: must remain in-between
+          (
+            m.end.x == rowKing &&
+            m.end.y > kingPos1 &&
+            m.end.y < kingPos2
+          )
+        );
+      });
+    }
+    // piece == king: check only if move.end.y == enemy king column,
+    // or if move.end.x == enemy king rank.
+    const color = this.getColor(sq[0], sq[1]);
+    const oppCol = V.GetOppCol(color);
+    // check == -1 if (row, or col) unchecked, 1 if checked and occupied,
+    //          0 if checked and clear
+    let check = [-1, -1];
+    return moves.filter(m => {
+      if (
+        m.end.y != this.kingPos[oppCol][1] &&
+        m.end.x != this.kingPos[oppCol][0]
+      ) {
+        return true;
+      }
+      // TODO: factor two next "if"...
+      if (m.end.x == this.kingPos[oppCol][0]) {
+        if (check[0] < 0) {
+          // Do the check:
+          check[0] = 0;
+          let [kingPos1, kingPos2] =
+            [this.kingPos[color][1], this.kingPos[oppCol][1]];
+          if (kingPos1 > kingPos2) [kingPos1, kingPos2] = [kingPos2, kingPos1];
+          for (let i = kingPos1 + 1; i < kingPos2; i++) {
+            if (this.board[m.end.x][i] != V.EMPTY) {
+              check[0]++;
+              break;
+            }
+          }
+          return check[0] == 1;
+        }
+        // Check already done:
+        return check[0] == 1;
+      }
+      //if (m.end.y == this.kingPos[oppCol][1]) //true...
+      if (check[1] < 0) {
+        // Do the check:
+        check[1] = 0;
+        let [kingPos1, kingPos2] =
+          [this.kingPos[color][0], this.kingPos[oppCol][0]];
+        if (kingPos1 > kingPos2) [kingPos1, kingPos2] = [kingPos2, kingPos1];
+        for (let i = kingPos1 + 1; i < kingPos2; i++) {
+          if (this.board[i][m.end.y] != V.EMPTY) {
+            check[1]++;
+            break;
+          }
+        }
+        return check[1] == 1;
+      }
+      // Check already done:
+      return check[1] == 1;
+    });
+  }
+
+  getSlideNJumpMoves_([x, y], steps, oneStep) {
+    let moves = [];
+    outerLoop: for (let step of steps) {
+      const s = step.s;
+      let i = x + s[0];
+      let j = y + s[1];
+      while (V.OnBoard(i, j) && this.board[i][j] == V.EMPTY) {
+        if (!step.onlyTake) moves.push(this.getBasicMove([x, y], [i, j]));
+        // NOTE: (bad) HACK here, since onlyTake is true only for Eagle
+        // capturing moves, which are oneStep...
+        if (!!oneStep || !!step.onlyTake) continue outerLoop;
+        i += s[0];
+        j += s[1];
+      }
+      if (V.OnBoard(i, j) && this.canTake([x, y], [i, j]) && !step.onlyMove)
+        moves.push(this.getBasicMove([x, y], [i, j]));
+    }
+    return moves;
+  }
+
+  static get steps() {
+    return (
+      Object.assign(
+        {
+          t: [
+            { s: [-1, 0] },
+            { s: [1, 0] },
+            { s: [0, -1] },
+            { s: [0, 1] },
+            { s: [-1, -1], onlyMove: true },
+            { s: [-1, 1], onlyMove: true },
+            { s: [1, -1], onlyMove: true },
+            { s: [1, 1], onlyMove: true }
+          ],
+          c: [
+            { s: [-1, 0], onlyMove: true },
+            { s: [1, 0], onlyMove: true },
+            { s: [0, -1], onlyMove: true },
+            { s: [0, 1], onlyMove: true },
+            { s: [-1, -1] },
+            { s: [-1, 1] },
+            { s: [1, -1] },
+            { s: [1, 1] }
+          ],
+          e: [
+            { s: [-1, 0], onlyMove: true },
+            { s: [1, 0], onlyMove: true },
+            { s: [0, -1], onlyMove: true },
+            { s: [0, 1], onlyMove: true },
+            { s: [-1, -1], onlyMove: true },
+            { s: [-1, 1], onlyMove: true },
+            { s: [1, -1], onlyMove: true },
+            { s: [1, 1], onlyMove: true },
+            { s: [-2, -1], onlyTake: true },
+            { s: [-2, 1], onlyTake: true },
+            { s: [-1, -2], onlyTake: true },
+            { s: [-1, 2], onlyTake: true },
+            { s: [1, -2], onlyTake: true },
+            { s: [1, 2], onlyTake: true },
+            { s: [2, -1], onlyTake: true },
+            { s: [2, 1], onlyTake: true }
+          ]
+        },
+        ChessRules.steps
+      )
+    );
+  }
+
+  getPotentialTowerMoves(sq) {
+    return this.getSlideNJumpMoves_(sq, V.steps[V.TOWER]);
+  }
+
+  getPotentialCardinalMoves(sq) {
+    return this.getSlideNJumpMoves_(sq, V.steps[V.CARDINAL]);
+  }
+
+  getPotentialEagleMoves(sq) {
+    return this.getSlideNJumpMoves_(sq, V.steps[V.EAGLE]);
+  }
+
+  getPotentialDukeMoves([x, y]) {
+    // Anything to capture around? mark other steps to explore after
+    let steps = [];
+    const oppCol = V.GetOppCol(this.getColor(x, y));
+    let moves = [];
+    for (let s of V.steps[V.ROOK].concat(V.steps[V.BISHOP])) {
+      const [i, j] = [x + s[0], y + s[1]];
+      if (
+        V.OnBoard(i, j) &&
+        this.board[i][j] != V.EMPTY &&
+        this.getColor(i, j) == oppCol
+      ) {
+        moves.push(super.getBasicMove([x, y], [i, j]));
+      }
+      else steps.push({ s: s, onlyMove: true });
+    }
+    if (steps.length > 0) {
+      const noncapturingMoves = this.getSlideNJumpMoves_([x, y], steps);
+      Array.prototype.push.apply(moves, noncapturingMoves);
+    }
+    return moves;
+  }
+
+  getPotentialKingMoves([x, y]) {
+    if (this.getColor(x, y) == 'b') return super.getPotentialKingMoves([x, y]);
+    // Empire doesn't castle:
+    return super.getSlideNJumpMoves(
+      [x, y],
+      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
+      "oneStep"
+    );
+  }
+
+  getPotentialSoldierMoves([x, y]) {
+    const c = this.getColor(x, y);
+    const shiftX = (c == 'w' ? -1 : 1);
+    const lastRank = (c == 'w' && x == 0 || c == 'b' && x == 9);
+    let steps = [];
+    if (!lastRank) steps.push([shiftX, 0]);
+    if (y > 0) steps.push([0, -1]);
+    if (y < 9) steps.push([0, 1]);
+    return super.getSlideNJumpMoves([x, y], steps, "oneStep");
+  }
+
+  isAttacked(sq, color) {
+    if (color == 'b') return super.isAttacked(sq, color);
+    // Empire: only pawn and king (+ queen if promotion) in common:
+    return (
+      super.isAttackedByPawn(sq, color) ||
+      this.isAttackedByTower(sq, color) ||
+      this.isAttackedByEagle(sq, color) ||
+      this.isAttackedByCardinal(sq, color) ||
+      this.isAttackedByDuke(sq, color) ||
+      this.isAttackedBySoldier(sq, color) ||
+      super.isAttackedByKing(sq, color) ||
+      super.isAttackedByQueen(sq, color)
+    );
+  }
+
+  isAttackedByTower(sq, color) {
+    return super.isAttackedBySlideNJump(sq, color, V.TOWER, V.steps[V.ROOK]);
+  }
+
+  isAttackedByEagle(sq, color) {
+    return super.isAttackedBySlideNJump(
+      sq, color, V.EAGLE, V.steps[V.KNIGHT], "oneStep");
+  }
+
+  isAttackedByCardinal(sq, color) {
+    return super.isAttackedBySlideNJump(
+      sq, color, V.CARDINAL, V.steps[V.BISHOP]);
+  }
+
+  isAttackedByDuke(sq, color) {
+    return (
+      super.isAttackedBySlideNJump(
+        sq, color, V.DUKE,
+        V.steps[V.ROOK].concat(V.steps[V.BISHOP]), "oneStep"
+      )
+    );
+  }
+
+  isAttackedBySoldier([x, y], color) {
+    const shiftX = (color == 'w' ? 1 : -1); //shift from king
+    return super.isAttackedBySlideNJump(
+      [x, y], color, V.SOLDIER, [[shiftX, 0], [0, 1], [0, -1]], "oneStep");
+  }
+
+  updateCastleFlags(move, piece) {
+    // Only black can castle:
+    const firstRank = 0;
+    if (piece == V.KING && move.appear[0].c == 'b')
+      this.castleFlags['b'] = [8, 8];
+    else if (
+      move.start.x == firstRank &&
+      this.castleFlags['b'].includes(move.start.y)
+    ) {
+      const flagIdx = (move.start.y == this.castleFlags['b'][0] ? 0 : 1);
+      this.castleFlags['b'][flagIdx] = 8;
+    }
+    else if (
+      move.end.x == firstRank &&
+      this.castleFlags['b'].includes(move.end.y)
+    ) {
+      const flagIdx = (move.end.y == this.castleFlags['b'][0] ? 0 : 1);
+      this.castleFlags['b'][flagIdx] = 8;
+    }
+  }
+
+  getCurrentScore() {
+    // Turn has changed:
+    const color = V.GetOppCol(this.turn);
+    const lastRank = (color == 'w' ? 0 : 7);
+    if (this.kingPos[color][0] == lastRank)
+      // The opposing edge is reached!
+      return color == "w" ? "1-0" : "0-1";
+    if (this.atLeastOneMove()) return "*";
+    // Game over
+    const oppCol = this.turn;
+    return (oppCol == "w" ? "0-1" : "1-0");
+  }
+
+  static get VALUES() {
+    return Object.assign(
+      {},
+      ChessRules.VALUES,
+      {
+        t: 7,
+        e: 7,
+        c: 4,
+        d: 4,
+        s: 2
+      }
+    );
+  }
+
+  static get SEARCH_DEPTH() {
+    return 2;
+  }
+
+};
diff --git a/client/src/variants/Minixiangqi.js b/client/src/variants/Minixiangqi.js
index 34e7d198..f467e2dc 100644
--- a/client/src/variants/Minixiangqi.js
+++ b/client/src/variants/Minixiangqi.js
@@ -74,6 +74,10 @@ export class MinixiangqiRules extends XiangqiRules {
     return evaluation;
   }
 
+  static get SEARCH_DEPTH() {
+    return 3;
+  }
+
   // Also no randomization here
   static GenRandInitFen() {
     return "rcnkncr/p1ppp1p/7/7/7/P1PPP1P/RCNKNCR w 0";
diff --git a/client/src/variants/Orda.js b/client/src/variants/Orda.js
index 308ae2f4..1fd5c1d3 100644
--- a/client/src/variants/Orda.js
+++ b/client/src/variants/Orda.js
@@ -37,58 +37,11 @@ export class OrdaRules extends ChessRules {
       'k': 'k'
     };
 
-    let pieces = { w: new Array(8), b: new Array(8) };
-    let flags = "";
-    // Shuffle pieces on first (and last rank if randomness == 2)
-    for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
-        pieces['b'] = pieces['w'].map(p => piecesMap[p]);
-        break;
-      }
-
-      // TODO: same code as in base_rules. Should extract and factorize?
-
-      let positions = ArrayFun.range(8);
-
-      let randIndex = 2 * randInt(4);
-      const bishop1Pos = positions[randIndex];
-      let randIndex_tmp = 2 * randInt(4) + 1;
-      const bishop2Pos = positions[randIndex_tmp];
-      positions.splice(Math.max(randIndex, randIndex_tmp), 1);
-      positions.splice(Math.min(randIndex, randIndex_tmp), 1);
-
-      randIndex = randInt(6);
-      const knight1Pos = positions[randIndex];
-      positions.splice(randIndex, 1);
-      randIndex = randInt(5);
-      const knight2Pos = positions[randIndex];
-      positions.splice(randIndex, 1);
-
-      randIndex = randInt(4);
-      const queenPos = positions[randIndex];
-      positions.splice(randIndex, 1);
-
-      const rook1Pos = positions[0];
-      const kingPos = positions[1];
-      const rook2Pos = positions[2];
-
-      pieces[c][rook1Pos] = "r";
-      pieces[c][knight1Pos] = "n";
-      pieces[c][bishop1Pos] = "b";
-      pieces[c][queenPos] = "q";
-      pieces[c][kingPos] = "k";
-      pieces[c][bishop2Pos] = "b";
-      pieces[c][knight2Pos] = "n";
-      pieces[c][rook2Pos] = "r";
-      if (c == 'b') pieces[c] = pieces[c].map(p => piecesMap[p]);
-      else flags = V.CoordToColumn(rook1Pos) + V.CoordToColumn(rook2Pos);
-    }
-    // Add turn + flags + enpassant
+    const baseFen = ChessRules.GenRandInitFen(randomness);
     return (
-      pieces["b"].join("") +
-      "/8/pppppppp/8/8/8/PPPPPPPP/" +
-      pieces["w"].join("").toUpperCase() +
-      " w 0 " + flags + " -"
+      baseFen.substr(0, 8).split('').map(p => piecesMap[p]).join('') +
+      // Skip 3 first rows + black castle flags
+      "/8/pppppppp" + baseFen.substr(19, 31) + " -"
     );
   }
 
@@ -186,24 +139,8 @@ export class OrdaRules extends ChessRules {
     return onlyMoves.concat(onlyTakes);
   }
 
-  getPotentialLancerMoves(sq) {
-    const onlyMoves = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.KNIGHT],
-      "oneStep",
-      { onlyMove: true }
-    );
-    const onlyTakes = this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK],
-      null,
-      { onlyTake: true }
-    );
-    return onlyMoves.concat(onlyTakes);
-  }
-
   getPotentialKheshigMoves(sq) {
-    return this.getSlideNJumpMoves(
+    return super.getSlideNJumpMoves(
       sq,
       V.steps[V.KNIGHT].concat(V.steps[V.ROOK]).concat(V.steps[V.BISHOP]),
       "oneStep"
@@ -211,7 +148,7 @@ export class OrdaRules extends ChessRules {
   }
 
   getPotentialYurtMoves(sq) {
-    return this.getSlideNJumpMoves(
+    return super.getSlideNJumpMoves(
       sq,
       V.steps[V.BISHOP].concat([ [1, 0] ]),
       "oneStep"
@@ -221,7 +158,7 @@ export class OrdaRules extends ChessRules {
   getPotentialKingMoves([x, y]) {
     if (this.getColor(x, y) == 'w') return super.getPotentialKingMoves([x, y]);
     // Horde doesn't castle:
-    return this.getSlideNJumpMoves(
+    return super.getSlideNJumpMoves(
       [x, y],
       V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
       "oneStep"
diff --git a/client/src/variants/Synochess.js b/client/src/variants/Synochess.js
new file mode 100644
index 00000000..b8021100
--- /dev/null
+++ b/client/src/variants/Synochess.js
@@ -0,0 +1,7 @@
+import { ChessRules } from "@/base_rules";
+
+export class SynochessRules extends ChessRules {
+
+  // TODO
+
+};
diff --git a/client/src/variants/Xiangqi.js b/client/src/variants/Xiangqi.js
index 1b49cedb..5deed643 100644
--- a/client/src/variants/Xiangqi.js
+++ b/client/src/variants/Xiangqi.js
@@ -259,17 +259,8 @@ export class XiangqiRules extends ChessRules {
   isAttackedByPawn([x, y], color) {
     // The pawn necessarily crossed the river (attack on king)
     const shiftX = (color == 'w' ? 1 : -1); //shift from king
-    for (let s of [[shiftX, 0], [0, 1], [0, -1]]) {
-      const [i, j] = [x + s[0], y + s[1]];
-      if (
-        this.board[i][j] != V.EMPTY &&
-        this.getColor(i, j) == color &&
-        this.getPiece(i, j) == V.PAWN
-      ) {
-        return true;
-      }
-    }
-    return false;
+    return super.isAttackedBySlideNJump(
+      [x, y], color, V.PAWN, [[shiftX, 0], [0, 1], [0, -1]], "oneStep");
   }
 
   knightStepsFromBishopStep(step) {
@@ -369,6 +360,10 @@ export class XiangqiRules extends ChessRules {
     return evaluation;
   }
 
+  static get SEARCH_DEPTH() {
+    return 2;
+  }
+
   static GenRandInitFen() {
     // No randomization here (TODO?)
     return "rneakaenr/9/1c5c1/p1p1p1p1p/9/9/P1P1P1P1P/1C5C1/9/RNEAKAENR w 0";
-- 
2.44.0