const parsedFen = V.ParseFen(fen);
this.setFlags(parsedFen.flags);
if (parsedFen.enpassant == "-")
- this.epSquares = [ [undefined,undefined] ];
+ this.epSquares = [ [undefined] ];
else
{
let res = [];
const squares = parsedFen.enpassant.split(",");
for (let sq of squares)
res.push(V.SquareToCoords(sq));
- if (res.length == 1)
- res.push(undefined); //always 2 slots in epSquares[i]
this.epSquares = [ res ];
}
this.scanKingsRooks(fen);
move.color = this.turn;
}
move.flags = JSON.stringify(this.aggregateFlags());
- let lastEpsq = this.epSquares[this.epSquares.length-1];
- const epSq = this.getEpSquare(move);
- if (lastEpsq.length == 1)
- lastEpsq.push(epSq);
- else
- {
- // New turn
- let newEpsqs = [epSq];
- if (this.startAtFirstMove && this.moves.length == 0)
- newEpsqs.push(undefined); //at first move, to force length==2 (TODO)
- this.epSquares.push(newEpsqs);
- }
V.PlayOnBoard(this.board, move);
+ const epSq = this.getEpSquare(move);
if (this.startAtFirstMove && this.moves.length == 0)
+ {
this.turn = "b";
+ this.epSquares.push([epSq]);
+ }
// Does this move give check on subturn 1? If yes, skip subturn 2
else if (this.subTurn==1 && this.underCheck(this.getOppCol(this.turn)))
{
- this.epSquares[this.epSquares.length-1].push(undefined);
this.turn = this.getOppCol(this.turn);
+ this.epSquares.push([epSq]);
move.checkOnSubturn1 = true;
}
else
{
if (this.subTurn == 2)
+ {
this.turn = this.getOppCol(this.turn);
+ let lastEpsq = this.epSquares[this.epSquares.length-1];
+ lastEpsq.push(epSq);
+ }
+ else
+ this.epSquares.push([epSq]);
this.subTurn = 3 - this.subTurn;
}
this.moves.push(move);
undo(move)
{
this.disaggregateFlags(JSON.parse(move.flags));
- let lastEpsq = this.epSquares[this.epSquares.length-1];
- if (lastEpsq.length == 2)
- {
- if (!!move.checkOnSubturn1 ||
- (this.startAtFirstMove && this.moves.length == 1))
- {
- this.epSquares.pop(); //remove real + artificial e.p. squares
- }
- else
- lastEpsq.pop();
- }
- else
- this.epSquares.pop();
V.UndoOnBoard(this.board, move);
if (this.startAtFirstMove && this.moves.length == 1)
+ {
this.turn = "w";
+ this.epSquares.pop();
+ }
else if (move.checkOnSubturn1)
{
this.turn = this.getOppCol(this.turn);
this.subTurn = 1;
+ this.epSquares.pop();
}
else
{
if (this.subTurn == 1)
+ {
this.turn = this.getOppCol(this.turn);
+ let lastEpsq = this.epSquares[this.epSquares.length-1];
+ lastEpsq.pop();
+ }
+ else
+ this.epSquares.pop();
this.subTurn = 3 - this.subTurn;
}
this.moves.pop();
const maxeval = V.INFINITY;
const color = this.turn;
const oppCol = this.getOppCol(this.turn);
-//if (this.moves.length == 25)
-// debugger;
-console.log("turn before " + this.turn + " " + this.subTurn);
+
// Search best (half) move for opponent turn
const getBestMoveEval = () => {
+ const turnBefore = this.turn + this.subTurn;
let moves = this.getAllValidMoves();
if (moves.length == 0)
{
for (let m of moves)
{
this.play(m);
- this.turn = color; //very artificial...
+ // Now turn is oppCol,2 if m doesn't give check
+ // Otherwise it's color,1. In both cases the next test makes sense
if (!this.atLeastOneMove())
{
const score = this.checkGameEnd();
else
{
// Found a mate
- this.turn = oppCol;
this.undo(m);
return maxeval * (score == "1-0" ? 1 : -1);
}
}
const evalPos = this.evalPosition();
res = (oppCol == "w" ? Math.max(res, evalPos) : Math.min(res, evalPos));
- this.turn = oppCol;
this.undo(m);
}
return res;
};
let moves11 = this.getAllValidMoves();
-console.log("turn after " + this.turn + " " + this.subTurn);
-
-if (this.moves.length == 25)
- debugger;
-
-
let doubleMoves = [];
// Rank moves using a min-max at depth 2
for (let i=0; i<moves11.length; i++)
moves:[moves11[i],moves12[j]],
eval:getBestMoveEval()});
this.undo(moves12[j]);
- console.log("------ after undo of " + this.getNotation(moves12[j]) + " " + this.turn + " " + this.subTurn);
}
}
this.undo(moves11[i]);
-
- console.log("after undo of " + this.getNotation(moves11[i]) + " " + this.turn + " " + this.subTurn);
-
- }
-console.log("turn interm " + this.turn + " " + this.subTurn);
-
- for (let i=0; i<doubleMoves.length; i++)
- {
- if (doubleMoves[i].moves.length == 2)
- {
- if (this.moves.length == 1
- && this.getNotation(doubleMoves[i].moves[0])=="a5"
- && this.getNotation(doubleMoves[i].moves[1])=="h6")
- {
- return doubleMoves[i].moves;
- }
- if (this.moves.length == 5
- && this.getNotation(doubleMoves[i].moves[0])=="c6"
- && this.getNotation(doubleMoves[i].moves[1])=="Kc7")
- {
- return doubleMoves[i].moves;
- }
- if (this.moves.length == 9
- && this.getNotation(doubleMoves[i].moves[0])=="d6"
- && this.getNotation(doubleMoves[i].moves[1])=="dxe5")
- {
- return doubleMoves[i].moves;
- }
- if (this.moves.length == 13
- && this.getNotation(doubleMoves[i].moves[0])=="fxe6"
- && this.getNotation(doubleMoves[i].moves[1])=="Rxf1")
- {
- return doubleMoves[i].moves;
- }
- if (this.moves.length == 17
- && this.getNotation(doubleMoves[i].moves[0])=="Nb6"
- && this.getNotation(doubleMoves[i].moves[1])=="Bg6")
- {
- return doubleMoves[i].moves;
- }
- if (this.moves.length == 21
- && this.getNotation(doubleMoves[i].moves[0])=="Bxe4"
- && this.getNotation(doubleMoves[i].moves[1])=="Nxd3") //Bxd3
- {
- return doubleMoves[i].moves;
- }
- if (this.moves.length == 25
- && this.getNotation(doubleMoves[i].moves[0])=="Na4"
- && this.getNotation(doubleMoves[i].moves[1])=="xb6") //Nxb6
- {
- debugger;
- return doubleMoves[i].moves;
- }
- }
}
-console.log("turn intermBIS " + this.turn + " " + this.subTurn);
doubleMoves.sort( (a,b) => {
return (color=="w" ? 1 : -1) * (b.eval - a.eval); });
{
candidates.push(i);
}
-console.log("turn END " + this.turn + " " + this.subTurn);
const selected = doubleMoves[_.sample(candidates, 1)].moves;
if (selected.length == 1)
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