X-Git-Url: https://git.auder.net/?p=vchess.git;a=blobdiff_plain;f=client%2Fsrc%2Fvariants%2FLosers.js;h=d752f984bc4f5375ba3b23eba44f7694d812c979;hp=caebd2972dffe468005ed79ad1ca74d9241e0f4b;hb=6b7b2cf720e6255e4da0dc34fee363c456346a58;hpb=f5a31ba0f98d215d432b7d3c86388af749df33a4

diff --git a/client/src/variants/Losers.js b/client/src/variants/Losers.js
index caebd297..d752f984 100644
--- a/client/src/variants/Losers.js
+++ b/client/src/variants/Losers.js
@@ -3,207 +3,73 @@ import { ArrayFun } from "@/utils/array";
 import { randInt } from "@/utils/alea";
 
 export const VariantRules = class LosersRules extends ChessRules {
-  static get HasFlags() {
-    return false;
-  }
-
-  getPotentialPawnMoves([x, y]) {
-    let moves = super.getPotentialPawnMoves([x, y]);
-
-    // Complete with promotion(s) into king, if possible
-    const color = this.turn;
-    const shift = color == "w" ? -1 : 1;
-    const lastRank = color == "w" ? 0 : V.size.x - 1;
-    if (x + shift == lastRank) {
-      // Normal move
-      if (this.board[x + shift][y] == V.EMPTY)
-        moves.push(
-          this.getBasicMove([x, y], [x + shift, y], { c: color, p: V.KING })
-        );
-      // Captures
-      if (
-        y > 0 &&
-        this.canTake([x, y], [x + shift, y - 1]) &&
-        this.board[x + shift][y - 1] != V.EMPTY
-      ) {
-        moves.push(
-          this.getBasicMove([x, y], [x + shift, y - 1], { c: color, p: V.KING })
-        );
-      }
-      if (
-        y < V.size.y - 1 &&
-        this.canTake([x, y], [x + shift, y + 1]) &&
-        this.board[x + shift][y + 1] != V.EMPTY
-      ) {
-        moves.push(
-          this.getBasicMove([x, y], [x + shift, y + 1], { c: color, p: V.KING })
-        );
-      }
-    }
-
-    return moves;
-  }
-
-  getPotentialKingMoves(sq) {
-    // No castle:
-    return this.getSlideNJumpMoves(
-      sq,
-      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
-      "oneStep"
-    );
+  // Trim all non-capturing moves
+  static KeepCaptures(moves) {
+    return moves.filter(m => m.vanish.length == 2);
   }
 
-  // Stop at the first capture found (if any)
+	// 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) {
-          const moves = this.getPotentialMovesFrom([i, j]);
-          if (moves.length > 0) {
-            for (let k = 0; k < moves.length; k++) {
-              if (
-                moves[k].vanish.length == 2 &&
-                this.filterValid([moves[k]]).length > 0
-              )
-                return true;
-            }
-          }
+        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;
   }
 
-  // Trim all non-capturing moves
-  static KeepCaptures(moves) {
-    return moves.filter(m => {
-      return m.vanish.length == 2;
-    });
-  }
-
   getPossibleMovesFrom(sq) {
     let moves = this.filterValid(this.getPotentialMovesFrom(sq));
-    // This is called from interface: we need to know if a capture is possible
-    if (this.atLeastOneCapture()) moves = V.KeepCaptures(moves);
+    const captureMoves = V.KeepCaptures(moves);
+    if (captureMoves.length > 0) return captureMoves;
+    if (this.atLeastOneCapture()) return [];
     return moves;
   }
 
   getAllValidMoves() {
-    let moves = super.getAllValidMoves();
-    if (
-      moves.some(m => {
-        return m.vanish.length == 2;
-      })
-    )
-      moves = V.KeepCaptures(moves);
+    const moves = super.getAllValidMoves();
+    if (moves.some(m => m.vanish.length == 2)) return V.KeepCaptures(moves);
     return moves;
   }
 
-  underCheck() {
-    return false; //No notion of check
-  }
-
-  getCheckSquares() {
-    return [];
-  }
-
-  // No variables update because no royal king + no castling
-  updateVariables() {}
-  unupdateVariables() {}
-
   getCurrentScore() {
-    if (this.atLeastOneMove())
-      // game not over
-      return "*";
-
-    // No valid move: the side who cannot move wins
+    // If only my king remains, I win
+    const color = this.turn;
+    let onlyKing = true;
+    outerLoop: 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) == color &&
+          this.getPiece(i,j) != V.KING
+        ) {
+          onlyKing = false;
+          break outerLoop;
+        }
+      }
+    }
+    if (onlyKing) return color == "w" ? "1-0" : "0-1";
+    if (this.atLeastOneMove()) return "*";
+    // No valid move: the side who cannot move (or is checkmated) wins
     return this.turn == "w" ? "1-0" : "0-1";
   }
 
-  static get VALUES() {
-    // Experimental...
-    return {
-      p: 1,
-      r: 7,
-      n: 3,
-      b: 3,
-      q: 5,
-      k: 5
-    };
-  }
-
   static get SEARCH_DEPTH() {
     return 4;
   }
 
   evalPosition() {
-    return -super.evalPosition(); //better with less material
-  }
-
-  static GenRandInitFen(randomness) {
-    if (randomness == 0)
-      return "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w 0 -";
-
-    let pieces = { w: new Array(8), b: new Array(8) };
-    // Shuffle pieces on first and last rank
-    for (let c of ["w", "b"]) {
-      if (c == 'b' && randomness == 1) {
-        pieces['b'] = pieces['w'];
-        break;
-      }
-
-      let positions = ArrayFun.range(8);
-
-      // Get random squares for bishops
-      let randIndex = 2 * randInt(4);
-      let bishop1Pos = positions[randIndex];
-      // The second bishop must be on a square of different color
-      let randIndex_tmp = 2 * randInt(4) + 1;
-      let bishop2Pos = positions[randIndex_tmp];
-      // Remove chosen squares
-      positions.splice(Math.max(randIndex, randIndex_tmp), 1);
-      positions.splice(Math.min(randIndex, randIndex_tmp), 1);
-
-      // Get random squares for knights
-      randIndex = randInt(6);
-      let knight1Pos = positions[randIndex];
-      positions.splice(randIndex, 1);
-      randIndex = randInt(5);
-      let knight2Pos = positions[randIndex];
-      positions.splice(randIndex, 1);
-
-      // Get random square for queen
-      randIndex = randInt(4);
-      let queenPos = positions[randIndex];
-      positions.splice(randIndex, 1);
-
-      // Random square for king (no castle)
-      randIndex = randInt(3);
-      let kingPos = positions[randIndex];
-      positions.splice(randIndex, 1);
-
-      // Rooks positions are now fixed
-      let rook1Pos = positions[0];
-      let rook2Pos = positions[1];
-
-      // Finally put the shuffled pieces in the board array
-      pieces[c][rook1Pos] = "r";
-      pieces[c][knight1Pos] = "n";
-      pieces[c][bishop1Pos] = "b";
-      pieces[c][queenPos] = "q";
-      pieces[c][kingPos] = "k";
-      pieces[c][bishop2Pos] = "b";
-      pieces[c][knight2Pos] = "n";
-      pieces[c][rook2Pos] = "r";
-    }
-    return (
-      pieces["b"].join("") +
-      "/pppppppp/8/8/8/8/PPPPPPPP/" +
-      pieces["w"].join("").toUpperCase() +
-      // En-passant allowed, but no flags
-      " w 0 -"
-    );
+    // Less material is better (more subtle in fact but...)
+    return -super.evalPosition();
   }
 };