Add Rugby variant

[vchess.git] / client / src / variants / Rugby.js

diff --git a/client/src/variants/Rugby.js b/client/src/variants/Rugby.js
new file mode 100644 (file)
index 0000000..04306c2
--- /dev/null
+++ b/client/src/variants/Rugby.js
@@ -0,0 +1,58 @@
+import { ChessRules } from "@/base_rules";
+import { ArrayFun } from "@/utils/array";
+
+export class RugbyRules extends ChessRules {
+  static get HasFlags() {
+    return false;
+  }
+
+  static get PawnSpecs() {
+    return Object.assign(
+      {},
+      ChessRules.PawnSpecs,
+      { promotions: [V.PAWN] }
+    );
+  }
+
+  getPotentialMovesFrom(sq) {
+    // There are only pawns:
+    return this.getPotentialPawnMoves(sq);
+  }
+
+  getPotentialPawnMoves(sq) {
+    const moves = super.getPotentialPawnMoves(sq);
+    // Add king movements, without capturing
+    const steps =
+      this.turn == 'w'
+        ? [ [-1,-1], [-1,1], [0,1], [0,-1], [1,-1], [1,0], [1,1] ]
+        : [ [1,-1], [1,1], [0,1], [0,-1], [-1,-1], [-1,0], [-1,1] ];
+    let addMoves = this.getSlideNJumpMoves(sq, steps, "oneStep");
+    return moves.concat(addMoves.filter(m => m.vanish.length == 1));
+  }
+
+  static GenRandInitFen() {
+    // Non-randomized variant. En-passant possible:
+    return "pppppppp/8/8/8/8/8/8/PPPPPPPP w 0 -";
+  }
+
+  filterValid(moves) {
+    return moves;
+  }
+
+  prePlay() {}
+  postPlay() {}
+  preUndo() {}
+  postUndo() {}
+
+  getCurrentScore() {
+    // Turn has changed:
+    const color = V.GetOppCol(this.turn);
+    const lastRank = (color == "w" ? 0 : V.size.x - 1);
+    if (ArrayFun.range(8).some(i => this.getColor(lastRank, i) == color))
+      // The opposing edge is reached!
+      return color == "w" ? "1-0" : "0-1";
+    if (this.atLeastOneMove()) return "*";
+    // Stalemate (will probably never happen)
+    return "1/2";
+  }
+};