Some fixes, work on Eightpieces draft, add a few capturing variants

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

diff --git a/client/src/variants/Capture.js b/client/src/variants/Capture.js
new file mode 100644 (file)
index 0000000..a43f167
--- /dev/null
+++ b/client/src/variants/Capture.js
@@ -0,0 +1,48 @@
+import { ChessRules } from "@/base_rules";
+import { ArrayFun } from "@/utils/array";
+import { randInt } from "@/utils/alea";
+
+export const VariantRules = class LosersRules extends ChessRules {
+  // Trim all non-capturing moves
+  static KeepCaptures(moves) {
+    return moves.filter(m => m.vanish.length == 2);
+  }
+
+       // Stop at the first capture found (if any)
+  atLeastOneCapture() {
+    const color = this.turn;
+    const oppCol = V.GetOppCol(color);
+    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 &&
+          this.getColor(i, j) != oppCol &&
+          this.getPotentialMovesFrom([i, j]).some(m =>
+            // Warning: duscard castle moves
+            m.vanish.length == 2 && m.appear.length == 1)
+        ) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
+  getPossibleMovesFrom(sq) {
+    let moves = this.filterValid(this.getPotentialMovesFrom(sq));
+    const captureMoves = V.KeepCaptures(moves);
+    if (captureMoves.length > 0) return captureMoves;
+    if (this.atLeastOneCapture()) return [];
+    return moves;
+  }
+
+  getAllValidMoves() {
+    const moves = super.getAllValidMoves();
+    if (moves.some(m => m.vanish.length == 2)) return V.KeepCaptures(moves);
+    return moves;
+  }
+
+  static get SEARCH_DEPTH() {
+    return 4;
+  }
+};