X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=client%2Fsrc%2Fvariants%2FKoopa.js;h=57d19b929f92e4decffa8aceee8a4667829f66f0;hb=c3ff3a0c807d97c0311a06491318fe02440266db;hp=8d4f0e97ff7d9ff6728191797bece4fd87a0263f;hpb=fccaa87852129f8f27c66a9d3b626f91868109c8;p=vchess.git

diff --git a/client/src/variants/Koopa.js b/client/src/variants/Koopa.js
index 8d4f0e97..57d19b92 100644
--- a/client/src/variants/Koopa.js
+++ b/client/src/variants/Koopa.js
@@ -118,7 +118,17 @@ export class KoopaRules extends ChessRules {
   }
 
   getPotentialMovesFrom([x, y]) {
-    let moves = super.getPotentialMovesFrom([x, y]);
+    let moves = super.getPotentialMovesFrom([x, y]).filter(m => {
+      if (
+        m.vanish[0].p != V.PAWN ||
+        m.appear[0].p == V.PAWN ||
+        m.vanish.length == 1
+      ) {
+        return true;
+      }
+      // Pawn promotion, "capturing": remove duplicates
+      return m.appear[0].p == V.QUEEN;
+    });
     // Complete moves: stuns & kicks
     let promoteAfterStun = [];
     const color = this.turn;