Add Knightrelay1. Some fixes. Move odd 'isAttackedBy_multiple_colors' to Checkered...

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

diff --git a/client/src/variants/Berolina.js b/client/src/variants/Berolina.js
index 03b1b3b..ae15095 100644 (file)
--- a/client/src/variants/Berolina.js
+++ b/client/src/variants/Berolina.js
@@ -23,12 +23,36 @@ export const VariantRules = class BerolinaRules extends ChessRules {
           x: (ex + sx) / 2,
           y: (move.end.y + sy) / 2
         },
+        // The arrival column must be remembered, because
+        // potentially two pawns could be candidates to be captured:
+        // one on our left, and one on our right.
         move.end.y
       ];
     }
     return undefined; //default
   }
 
+  static IsGoodEnpassant(enpassant) {
+    if (enpassant != "-") {
+      const epParts = enpassant.split(",");
+      const epSq = V.SquareToCoords(epParts[0]);
+      if (isNaN(epSq.x) || isNaN(epSq.y) || !V.OnBoard(epSq)) return false;
+      const arrCol = V.ColumnToCoord(epParts[1]);
+      if (isNaN(arrCol) || arrCol < 0 || arrCol >= V.size.y) return false;
+    }
+    return true;
+  }
+
+  getEnpassantFen() {
+    const L = this.epSquares.length;
+    if (!this.epSquares[L - 1]) return "-"; //no en-passant
+    return (
+      V.CoordsToSquare(this.epSquares[L - 1][0]) +
+      "," +
+      V.CoordToColumn(this.epSquares[L - 1][1])
+    );
+  }
+
   // Special pawns movements
   getPotentialPawnMoves([x, y]) {
     const color = this.turn;
@@ -81,8 +105,7 @@ export const VariantRules = class BerolinaRules extends ChessRules {
     if (
       !!epSquare &&
       epSquare[0].x == x + shiftX &&
-      epSquare[0].y == y &&
-      Math.abs(epSquare[1] - y) == 1
+      epSquare[0].y == y
     ) {
       let enpassantMove = this.getBasicMove([x, y], [x + shiftX, y]);
       enpassantMove.vanish.push({
@@ -97,16 +120,14 @@ export const VariantRules = class BerolinaRules extends ChessRules {
     return moves;
   }
 
-  isAttackedByPawn([x, y], colors) {
-    for (let c of colors) {
-      let pawnShift = c == "w" ? 1 : -1;
-      if (x + pawnShift >= 0 && x + pawnShift < V.size.x) {
-        if (
-          this.getPiece(x + pawnShift, y) == V.PAWN &&
-          this.getColor(x + pawnShift, y) == c
-        ) {
-          return true;
-        }
+  isAttackedByPawn([x, y], color) {
+    let pawnShift = (color == "w" ? 1 : -1);
+    if (x + pawnShift >= 0 && x + pawnShift < V.size.x) {
+      if (
+        this.getPiece(x + pawnShift, y) == V.PAWN &&
+        this.getColor(x + pawnShift, y) == color
+      ) {
+        return true;
       }
     }
     return false;