Fix Koopa variant: always allow castlin with a non-stunned rook

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

diff --git a/client/src/variants/Koopa.js b/client/src/variants/Koopa.js
index bc72d6d..27c147a 100644 (file)
--- a/client/src/variants/Koopa.js
+++ b/client/src/variants/Koopa.js
@@ -205,6 +205,16 @@ export class KoopaRules extends ChessRules {
     return moves.concat(promoteAfterStun);
   }
 
+  getPotentialKingMoves(sq) {
+    return (
+      this.getSlideNJumpMoves(
+        sq,
+        V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
+        "oneStep"
+      ).concat(super.getCastleMoves(sq, true, ['r']))
+    );
+  }
+
   filterValid(moves) {
     // Forbid kicking own king out
     const color = this.turn;
@@ -235,11 +245,16 @@ export class KoopaRules extends ChessRules {
     // Base method is fine because a stunned king (which won't be detected)
     // can still castle after going back to normal.
     super.postPlay(move);
-    const kIdx = move.vanish.findIndex(
-      (v,i) => v.p == 'l' || (i >= 1 && v.p == 'k'));
-    if (kIdx >= 0)
-      // A (stunned or not) king vanish: game over
-      this.kingPos[move.vanish[kIdx].c] = [-1, -1];
+    const color = this.turn;
+    const kp = this.kingPos[color];
+    if (
+      this.board[kp[0], kp[1]] == V.EMPTY ||
+      !['k', 'l'].includes(this.getPiece(kp[0], kp[1])) ||
+      this.getColor(kp[0], kp[1]) != color
+    ) {
+      // King didn't move by itself, and vanished => game over
+      this.kingPos[color] = [-1, -1];
+    }
     move.stunned = JSON.stringify(this.stunned);
     // Array of stunned stage 1 pieces (just back to normal then)
     Object.keys(this.stunned).forEach(square => {
@@ -269,12 +284,12 @@ export class KoopaRules extends ChessRules {
 
   postUndo(move) {
     super.postUndo(move);
-    const kIdx = move.vanish.findIndex(
-      (v,i) => v.p == 'l' || (i >= 1 && v.p == 'k'));
-    if (kIdx >= 0) {
-      // A king vanished
-      this.kingPos[move.vanish[kIdx].c] =
-        [move.vanish[kIdx].x, move.vanish[kIdx].y];
+    const oppCol = V.GetOppCol(this.turn);
+    if (this.kingPos[oppCol][0] < 0) {
+      // Opponent's king vanished
+      const psq =
+        move.vanish.find((v,i) => i >= 1 && ['k', 'l'].includes(v.p));
+      this.kingPos[oppCol] = [psq.x, psq.y];
     }
     this.stunned = JSON.parse(move.stunned);
     for (let i=0; i<8; i++) {