X-Git-Url: https://git.auder.net/?a=blobdiff_plain;f=client%2Fsrc%2Fvariants%2FBerolina.js;h=e5a222bb8de5a84a26b898909dc45238cd014602;hb=2c5d7b20742b802d9c47916915c1114bcfc9a9c3;hp=03b1b3b275a934a39e4b2e1476ea493e12dc9637;hpb=6808d7a16ec1e761c6a2dffec2281c96953e4d89;p=vchess.git

diff --git a/client/src/variants/Berolina.js b/client/src/variants/Berolina.js
index 03b1b3b2..e5a222bb 100644
--- a/client/src/variants/Berolina.js
+++ b/client/src/variants/Berolina.js
@@ -1,6 +1,6 @@
 import { ChessRules } from "@/base_rules";
 
-export const VariantRules = class BerolinaRules extends ChessRules {
+export class BerolinaRules extends ChessRules {
   // En-passant after 2-sq jump
   getEpSquare(moveOrSquare) {
     if (!moveOrSquare) return undefined;
@@ -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;
@@ -38,7 +62,9 @@ export const VariantRules = class BerolinaRules extends ChessRules {
     const startRank = color == "w" ? sizeX - 2 : 1;
     const lastRank = color == "w" ? 0 : sizeX - 1;
     const finalPieces =
-      x + shiftX == lastRank ? [V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN] : [V.PAWN];
+      x + shiftX == lastRank
+        ? [V.ROOK, V.KNIGHT, V.BISHOP, V.QUEEN]
+        : [V.PAWN];
 
     // One square diagonally
     for (let shiftY of [-1, 1]) {
@@ -52,6 +78,7 @@ export const VariantRules = class BerolinaRules extends ChessRules {
           );
         }
         if (
+          V.PawnSpecs.twoSquares &&
           x == startRank &&
           y + 2 * shiftY >= 0 &&
           y + 2 * shiftY < sizeY &&
@@ -75,43 +102,47 @@ export const VariantRules = class BerolinaRules extends ChessRules {
         );
     }
 
-    // En passant
-    const Lep = this.epSquares.length;
-    const epSquare = this.epSquares[Lep - 1]; //always at least one element
-    if (
-      !!epSquare &&
-      epSquare[0].x == x + shiftX &&
-      epSquare[0].y == y &&
-      Math.abs(epSquare[1] - y) == 1
-    ) {
-      let enpassantMove = this.getBasicMove([x, y], [x + shiftX, y]);
-      enpassantMove.vanish.push({
-        x: x,
-        y: epSquare[1],
-        p: "p",
-        c: this.getColor(x, epSquare[1])
-      });
-      moves.push(enpassantMove);
+    // Next condition so that other variants could inherit from this class
+    if (V.PawnSpecs.enPassant) {
+      // En passant
+      const Lep = this.epSquares.length;
+      const epSquare = this.epSquares[Lep - 1]; //always at least one element
+      if (
+        !!epSquare &&
+        epSquare[0].x == x + shiftX &&
+        epSquare[0].y == y
+      ) {
+        let enpassantMove = this.getBasicMove([x, y], [x + shiftX, y]);
+        enpassantMove.vanish.push({
+          x: x,
+          y: epSquare[1],
+          p: "p",
+          c: this.getColor(x, epSquare[1])
+        });
+        moves.push(enpassantMove);
+      }
     }
 
     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;
   }
 
+  static get SEARCH_DEPTH() {
+    return 2;
+  }
+
   getNotation(move) {
     const piece = this.getPiece(move.start.x, move.start.y);
     if (piece == V.PAWN) {
@@ -127,7 +158,7 @@ export const VariantRules = class BerolinaRules extends ChessRules {
         notation = startSquare + finalSquare;
       }
       if (move.appear[0].p != V.PAWN)
-        //promotion
+        // Promotion
         notation += "=" + move.appear[0].p.toUpperCase();
       return notation;
     }