Rename connect --> Align4

[vchess.git] / client / src / variants / Align4.js

diff --git a/client/src/variants/Align4.js b/client/src/variants/Align4.js
new file mode 100644 (file)
index 0000000..fb43871
--- /dev/null
+++ b/client/src/variants/Align4.js
@@ -0,0 +1,201 @@
+import { ChessRules, Move, PiPo } from "@/base_rules";
+
+export class Align4Rules extends ChessRules {
+
+  static GenRandInitFen(randomness) {
+    const baseFen = ChessRules.GenRandInitFen(Math.min(randomness, 1));
+    return "4k3/8" + baseFen.substring(17, 50) + " -";
+  }
+
+  getReservePpath() {
+    return "bp";
+  }
+
+  static get RESERVE_PIECES() {
+    return [V.PAWN]; //only black pawns
+  }
+
+  getColor(i, j) {
+    if (i >= V.size.x) return "b";
+    return this.board[i][j].charAt(0);
+  }
+
+  getPiece(i, j) {
+    if (i >= V.size.x) return V.PAWN;
+    return this.board[i][j].charAt(1);
+  }
+
+  static IsGoodFlags(flags) {
+    // Only white can castle
+    return !!flags.match(/^[a-z]{2,2}$/);
+  }
+
+  getFlagsFen() {
+    return this.castleFlags['w'].map(V.CoordToColumn).join("");
+  }
+
+  setFlags(fenflags) {
+    this.castleFlags = { 'w': [-1, -1] };
+    for (let i = 0; i < 2; i++)
+      this.castleFlags['w'][i] = V.ColumnToCoord(fenflags.charAt(i));
+  }
+
+  setOtherVariables(fen) {
+    super.setOtherVariables(fen);
+    this.reserve = { b: { [V.PAWN]: 1 } };
+  }
+
+  getReserveMoves() {
+    if (this.turn != 'b') return [];
+    let moves = [];
+    for (let i = 1; i <= 6; i++) {
+      for (let j = 0; j < V.size.y; j++) {
+        if (this.board[i][j] == V.EMPTY) {
+          let mv = new Move({
+            appear: [
+              new PiPo({
+                x: i,
+                y: j,
+                c: 'b',
+                p: 'p'
+              })
+            ],
+            vanish: [],
+            start: { x: 9, y: 0 },
+            end: { x: i, y: j }
+          });
+          moves.push(mv);
+        }
+      }
+    }
+    return moves;
+  }
+
+  getPotentialMovesFrom(sq) {
+    if (sq[0] >= V.size.x) return this.getReserveMoves();
+    return super.getPotentialMovesFrom(sq);
+  }
+
+  getPotentialKingMoves([x, y]) {
+    if (this.getColor(x, y) == 'w') return super.getPotentialKingMoves([x, y]);
+    // Black doesn't castle:
+    return super.getSlideNJumpMoves(
+      [x, y],
+      V.steps[V.ROOK].concat(V.steps[V.BISHOP]),
+      "oneStep"
+    );
+  }
+
+  getAllValidMoves() {
+    return (
+      super.getAllValidMoves().concat(
+        super.filterValid(this.getReserveMoves()))
+    );
+  }
+
+  atLeastOneMove() {
+    if (super.atLeastOneMove()) return true;
+    // Search one reserve move
+    if (this.filterValid(this.getReserveMoves()).length > 0) return true;
+    return false;
+  }
+
+  updateCastleFlags(move, piece) {
+    // Only white can castle:
+    const firstRank = 7;
+    if (piece == V.KING && move.appear[0].c == 'w')
+      this.castleFlags['w'] = [8, 8];
+    else if (
+      move.start.x == firstRank &&
+      this.castleFlags['w'].includes(move.start.y)
+    ) {
+      const flagIdx = (move.start.y == this.castleFlags['w'][0] ? 0 : 1);
+      this.castleFlags['w'][flagIdx] = 8;
+    }
+    else if (
+      move.end.x == firstRank &&
+      this.castleFlags['w'].includes(move.end.y)
+    ) {
+      const flagIdx = (move.end.y == this.castleFlags['w'][0] ? 0 : 1);
+      this.castleFlags['w'][flagIdx] = 8;
+    }
+  }
+
+  getCurrentScore() {
+    const score = super.getCurrentScore();
+    if (score != "*") return score;
+    // Check pawns connection:
+    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) == 'b' &&
+          this.getPiece(i, j) == V.PAWN
+        ) {
+          // Exploration "rightward + downward" is enough
+          for (let step of [[1, 0], [0, 1], [1, 1], [-1, 1]]) {
+            let [ii, jj] = [i + step[0], j + step[1]];
+            let kounter = 1;
+            while (
+              V.OnBoard(ii, jj) &&
+              this.board[ii][jj] != V.EMPTY &&
+              this.getColor(ii, jj) == 'b' &&
+              this.getPiece(ii, jj) != V.KING
+            ) {
+              kounter++;
+              ii += step[0];
+              jj += step[1];
+            }
+            if (kounter == 4) return "0-1";
+          }
+        }
+      }
+    }
+    return "*";
+  }
+
+  evalPosition() {
+    let evaluation = 0;
+    // Count white material + check pawns alignments
+    let maxAlign = 0;
+    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) {
+          const piece = this.getPiece(i, j);
+          if (piece != V.KING) {
+            const color = this.getColor(i, j);
+            if (color == 'w') evaluation += V.VALUES[piece];
+            else {
+              // Exploration "rightward + downward" is enough
+              for (let step of [[1, 0], [0, 1], [1, 1], [-1, 1]]) {
+                let [ii, jj] = [i + step[0], j + step[1]];
+                let kounter = 1;
+                while (
+                  V.OnBoard(ii, jj) &&
+                  this.board[ii][jj] != V.EMPTY &&
+                  this.getColor(ii, jj) == 'b' &&
+                  this.getPiece(ii, jj) != V.KING
+                ) {
+                  kounter++;
+                  ii += step[0];
+                  jj += step[1];
+                }
+                if (kounter > maxAlign) maxAlign = kounter;
+              }
+            }
+          }
+        }
+      }
+    }
+    // -1 for two aligned pawns, -3 for 3 aligned pawns.
+    if ([1, 2].includes(maxAlign)) maxAlign--;
+    return evaluation - maxAlign;
+  }
+
+  getNotation(move) {
+    if (move.vanish.length == 0) return "@" + V.CoordsToSquare(move.end);
+    return super.getNotation(move);
+  }
+
+};
+