return (Object.keys(this.ALICE_PIECES).includes(b[1]) ? "Alice/" : "") + b;
}
- initVariables(fen)
+ static get PIECES()
{
- super.initVariables(fen);
- const fenParts = fen.split(" ");
- const position = fenParts[0].split("/");
+ return ChessRules.PIECES.concat(Object.keys(V.ALICE_PIECES));
+ }
+
+ setOtherVariables(fen)
+ {
+ super.setOtherVariables(fen);
+ const rows = V.ParseFen(fen).position.split("/");
if (this.kingPos["w"][0] < 0 || this.kingPos["b"][0] < 0)
{
- // INIT_COL_XXX won't be used, so no need to set them for Alice kings
- for (let i=0; i<position.length; i++)
+ // INIT_COL_XXX won't be required if Alice kings are found (means 'king moved')
+ for (let i=0; i<rows.length; i++)
{
let k = 0; //column index on board
- for (let j=0; j<position[i].length; j++)
+ for (let j=0; j<rows[i].length; j++)
{
- switch (position[i].charAt(j))
+ switch (rows[i].charAt(j))
{
case 'l':
this.kingPos['b'] = [i,k];
this.kingPos['w'] = [i,k];
break;
default:
- let num = parseInt(position[i].charAt(j));
+ const num = parseInt(rows[i].charAt(j));
if (!isNaN(num))
k += (num-1);
}
}
}
+ // Return the (standard) color+piece notation at a square for a board
+ getSquareOccupation(i, j, mirrorSide)
+ {
+ const piece = this.getPiece(i,j);
+ if (mirrorSide==1 && Object.keys(V.ALICE_CODES).includes(piece))
+ return this.board[i][j];
+ else if (mirrorSide==2 && Object.keys(V.ALICE_PIECES).includes(piece))
+ return this.getColor(i,j) + V.ALICE_PIECES[piece];
+ return "";
+ }
+
// Build board of the given (mirror)side
getSideBoard(mirrorSide)
{
- const V = VariantRules;
// Build corresponding board from complete board
- const [sizeX,sizeY] = V.size;
- let sideBoard = doubleArray(sizeX, sizeY, "");
- for (let i=0; i<sizeX; i++)
+ let sideBoard = doubleArray(V.size.x, V.size.y, "");
+ for (let i=0; i<V.size.x; i++)
{
- for (let j=0; j<sizeY; j++)
- {
- const piece = this.getPiece(i,j);
- if (mirrorSide==1 && Object.keys(V.ALICE_CODES).includes(piece))
- sideBoard[i][j] = this.board[i][j];
- else if (mirrorSide==2 && Object.keys(V.ALICE_PIECES).includes(piece))
- sideBoard[i][j] = this.getColor(i,j) + V.ALICE_PIECES[piece];
- }
+ for (let j=0; j<V.size.y; j++)
+ sideBoard[i][j] = this.getSquareOccupation(i, j, mirrorSide);
}
return sideBoard;
}
// NOTE: castle & enPassant https://www.chessvariants.com/other.dir/alice.html
getPotentialMovesFrom([x,y], sideBoard)
{
- const pieces = Object.keys(VariantRules.ALICE_CODES);
- const codes = Object.keys(VariantRules.ALICE_PIECES);
+ const pieces = Object.keys(V.ALICE_CODES);
+ const codes = Object.keys(V.ALICE_PIECES);
const mirrorSide = (pieces.includes(this.getPiece(x,y)) ? 1 : 2);
+ const color = this.getColor(x,y);
// Search valid moves on sideBoard
let saveBoard = this.board;
this.board = sideBoard || this.getSideBoard(mirrorSide);
- let moves = super.getPotentialMovesFrom([x,y]);
+ let moves = super.getPotentialMovesFrom([x,y])
+ .filter(m => {
+ // Filter out king moves which result in under-check position on
+ // current board (before mirror traversing)
+ let aprioriValid = true;
+ if (m.appear[0].p == V.KING)
+ {
+ this.play(m);
+ if (this.underCheck(color))
+ aprioriValid = false;
+ this.undo(m);
+ }
+ return aprioriValid;
+ });
this.board = saveBoard;
// Finally filter impossible moves
let res = moves.filter(m => {
if (m.appear.length == 2) //castle
{
- // If appear[i] not in vanish array, then must be empty square on other board
- m.appear.forEach(psq => {
- if (this.board[psq.x][psq.y] != VariantRules.EMPTY &&
- ![m.vanish[0].y,m.vanish[1].y].includes(psq.y))
- {
+ // appear[i] must be an empty square on the other board
+ for (let psq of m.appear)
+ {
+ if (this.getSquareOccupation(psq.x,psq.y,3-mirrorSide) != V.EMPTY)
return false;
- }
- });
+ }
}
- else if (this.board[m.end.x][m.end.y] != VariantRules.EMPTY)
+ else if (this.board[m.end.x][m.end.y] != V.EMPTY)
{
// Attempt to capture
const piece = this.getPiece(m.end.x,m.end.y);
if (mirrorSide==1)
{
m.appear.forEach(psq => { //forEach: castling taken into account
- psq.p = VariantRules.ALICE_CODES[psq.p]; //goto board2
+ psq.p = V.ALICE_CODES[psq.p]; //goto board2
});
}
else //move on board2: mark vanishing pieces as Alice
{
m.vanish.forEach(psq => {
- psq.p = VariantRules.ALICE_CODES[psq.p];
+ psq.p = V.ALICE_CODES[psq.p];
});
}
// Fix en-passant captures
- if (m.vanish[0].p == VariantRules.PAWN
- && m.vanish.length == 2 && this.board[m.end.x][m.end.y] == VariantRules.EMPTY)
+ if (m.vanish[0].p == V.PAWN && m.vanish.length == 2
+ && this.board[m.end.x][m.end.y] == V.EMPTY)
{
m.vanish[1].c = this.getOppCol(this.getColor(x,y));
// In the special case of en-passant, if
// - board2 takes board1 : vanish[1] --> normal
let van = m.vanish[1];
if (mirrorSide==1 && codes.includes(this.getPiece(van.x,van.y)))
- van.p = VariantRules.ALICE_CODES[van.p];
+ van.p = V.ALICE_CODES[van.p];
else if (mirrorSide==2 && pieces.includes(this.getPiece(van.x,van.y)))
- van.p = VariantRules.ALICE_PIECES[van.p];
+ van.p = V.ALICE_PIECES[van.p];
}
return true;
});
if (moves.length == 0)
return [];
let sideBoard = [this.getSideBoard(1), this.getSideBoard(2)];
- return moves.filter(m => { return !this.underCheck(m, sideBoard); });
+ const color = this.turn;
+ return moves.filter(m => {
+ this.playSide(m, sideBoard); //no need to track flags
+ const res = !this.underCheck(color, sideBoard);
+ this.undoSide(m, sideBoard);
+ return res;
+ });
}
getAllValidMoves()
const color = this.turn;
const oppCol = this.getOppCol(color);
var potentialMoves = [];
- let [sizeX,sizeY] = VariantRules.size;
let sideBoard = [this.getSideBoard(1), this.getSideBoard(2)];
- for (var i=0; i<sizeX; i++)
+ for (var i=0; i<V.size.x; i++)
{
- for (var j=0; j<sizeY; j++)
+ for (var j=0; j<V.size.y; j++)
{
- if (this.board[i][j] != VariantRules.EMPTY && this.getColor(i,j) == color)
+ if (this.board[i][j] != V.EMPTY && this.getColor(i,j) == color)
{
const mirrorSide =
- (Object.keys(VariantRules.ALICE_CODES).includes(this.getPiece(i,j)) ? 1 : 2);
+ Object.keys(V.ALICE_CODES).includes(this.getPiece(i,j))
+ ? 1
+ : 2;
Array.prototype.push.apply(potentialMoves,
this.getPotentialMovesFrom([i,j], sideBoard[mirrorSide-1]));
}
// Play on sideboards [TODO: only one sideBoard required]
playSide(move, sideBoard)
{
- const pieces = Object.keys(VariantRules.ALICE_CODES);
+ const pieces = Object.keys(V.ALICE_CODES);
move.vanish.forEach(psq => {
const mirrorSide = (pieces.includes(psq.p) ? 1 : 2);
- sideBoard[mirrorSide-1][psq.x][psq.y] = VariantRules.EMPTY;
+ sideBoard[mirrorSide-1][psq.x][psq.y] = V.EMPTY;
});
move.appear.forEach(psq => {
const mirrorSide = (pieces.includes(psq.p) ? 1 : 2);
- const piece = (mirrorSide == 1 ? psq.p : VariantRules.ALICE_PIECES[psq.p]);
+ const piece = (mirrorSide == 1 ? psq.p : V.ALICE_PIECES[psq.p]);
sideBoard[mirrorSide-1][psq.x][psq.y] = psq.c + piece;
- if (piece == VariantRules.KING)
+ if (piece == V.KING)
this.kingPos[psq.c] = [psq.x,psq.y];
});
}
// Undo on sideboards
undoSide(move, sideBoard)
{
- const pieces = Object.keys(VariantRules.ALICE_CODES);
+ const pieces = Object.keys(V.ALICE_CODES);
move.appear.forEach(psq => {
const mirrorSide = (pieces.includes(psq.p) ? 1 : 2);
- sideBoard[mirrorSide-1][psq.x][psq.y] = VariantRules.EMPTY;
+ sideBoard[mirrorSide-1][psq.x][psq.y] = V.EMPTY;
});
move.vanish.forEach(psq => {
const mirrorSide = (pieces.includes(psq.p) ? 1 : 2);
- const piece = (mirrorSide == 1 ? psq.p : VariantRules.ALICE_PIECES[psq.p]);
+ const piece = (mirrorSide == 1 ? psq.p : V.ALICE_PIECES[psq.p]);
sideBoard[mirrorSide-1][psq.x][psq.y] = psq.c + piece;
- if (piece == VariantRules.KING)
+ if (piece == V.KING)
this.kingPos[psq.c] = [psq.x,psq.y];
});
}
- underCheck(move, sideBoard) //sideBoard arg always provided
+ underCheck(color, sideBoard) //sideBoard arg always provided
{
- const color = this.turn;
- this.playSide(move, sideBoard); //no need to track flags
const kp = this.kingPos[color];
- const mirrorSide = sideBoard[0][kp[0]][kp[1]] != VariantRules.EMPTY ? 1 : 2;
+ const mirrorSide = (sideBoard[0][kp[0]][kp[1]] != V.EMPTY ? 1 : 2);
let saveBoard = this.board;
this.board = sideBoard[mirrorSide-1];
let res = this.isAttacked(kp, [this.getOppCol(color)]);
this.board = saveBoard;
- this.undoSide(move, sideBoard);
return res;
}
- getCheckSquares(move)
+ getCheckSquares(color)
{
- this.play(move);
- const color = this.turn; //opponent
- const pieces = Object.keys(VariantRules.ALICE_CODES);
+ const pieces = Object.keys(V.ALICE_CODES);
const kp = this.kingPos[color];
const mirrorSide = (pieces.includes(this.getPiece(kp[0],kp[1])) ? 1 : 2);
let sideBoard = this.getSideBoard(mirrorSide);
? [ JSON.parse(JSON.stringify(this.kingPos[color])) ]
: [ ];
this.board = saveBoard;
- this.undo(move);
return res;
}
updateVariables(move)
{
super.updateVariables(move); //standard king
- const piece = this.getPiece(move.start.x,move.start.y);
- const c = this.getColor(move.start.x,move.start.y);
+ const piece = move.vanish[0].p;
+ const c = move.vanish[0].c;
// "l" = Alice king
if (piece == "l")
{
unupdateVariables(move)
{
super.unupdateVariables(move);
- const c = this.getColor(move.start.x,move.start.y);
- if (this.getPiece(move.start.x,move.start.y) == "l")
+ const c = move.vanish[0].c;
+ if (move.vanish[0].p == "l")
this.kingPos[c] = [move.start.x, move.start.y];
}
checkGameEnd()
{
- const pieces = Object.keys(VariantRules.ALICE_CODES);
+ const pieces = Object.keys(V.ALICE_CODES);
const color = this.turn;
const kp = this.kingPos[color];
const mirrorSide = (pieces.includes(this.getPiece(kp[0],kp[1])) ? 1 : 2);
return res;
}
- static get VALUES() {
- return {
- 'p': 1,
- 's': 1,
- 'r': 5,
- 'u': 5,
- 'n': 3,
- 'o': 3,
- 'b': 3,
- 'c': 3,
- 'q': 9,
- 't': 9,
- 'k': 1000,
- 'l': 1000
- };
+ static get VALUES()
+ {
+ return Object.assign(
+ ChessRules.VALUES,
+ {
+ 's': 1,
+ 'u': 5,
+ 'o': 3,
+ 'c': 3,
+ 't': 9,
+ 'l': 1000,
+ }
+ );
}
getNotation(move)
{
- if (move.appear.length == 2 && move.appear[0].p == VariantRules.KING)
+ if (move.appear.length == 2 && move.appear[0].p == V.KING)
{
if (move.end.y < move.start.y)
return "0-0-0";
return "0-0";
}
- const finalSquare =
- String.fromCharCode(97 + move.end.y) + (VariantRules.size[0]-move.end.x);
+ const finalSquare = V.CoordsToSquare(move.end);
const piece = this.getPiece(move.start.x, move.start.y);
const captureMark = (move.vanish.length > move.appear.length ? "x" : "");
let pawnMark = "";
if (["p","s"].includes(piece) && captureMark.length == 1)
- pawnMark = String.fromCharCode(97 + move.start.y); //start column
+ pawnMark = V.CoordToColumn(move.start.y); //start column
// Piece or pawn movement
let notation = piece.toUpperCase() + pawnMark + captureMark + finalSquare;
return notation;
}
}
+
+const VariantRules = AliceRules;
projects / vchess.git / blobdiff