public ulong Hash(IPieceMap board, Colour colour)
{
var squares = (board.White | board.Black).ToList();
ulong hash = 0ul;
foreach (var square in squares)
{
var piece = PieceMapHelpers.GetPiece(board, square);
hash ^= this.squares[square.ToSquareIndex(), (int)Index(piece)];
}
if (colour == Colour.White)
{
hash ^= colours[0];
}
else
{
hash ^= colours[1];
}
return(hash);
}
public void MakeMove(uint move)
{
var colour = move.GetColour();
var fromSquare = move.GetFrom();
var fromSquareIndex = move.GetFromIndex();
var toSquare = move.GetTo();
var toSquareIndex = move.GetToIndex();
var moveType = move.GetMoveType();
var pieceType = move.GetPieceType();
var capturePieceType = move.GetCapturePieceType();
// Copy current state
var state = CurrentState.StateFlags;
var enPassantSquare = (SquareFlag)0;
if (moveType == MoveType.CastleKing)
{
if (colour == Colour.White)
{
MakeWhiteKingSideCastle();
}
else
{
MakeBlackKingSideCastle();
}
state = RemoveCastleAvailability(colour, state);
}
else if (moveType == MoveType.CastleQueen)
{
if (colour == Colour.White)
{
MakeWhiteQueenSideCastle();
}
else
{
MakeBlackQueenSideCastle();
}
state = RemoveCastleAvailability(colour, state);
}
else if (moveType == MoveType.EnPassant)
{
MovePiece(colour, pieceType, fromSquare, toSquare);
// Capturing behind the opponent pawn so shift as if we are opponent
var captureSquare = toSquare.PawnForward(colour.Opposite(), 1);
RemovePiece(colour.Opposite(), captureSquare);
}
else if (moveType == MoveType.PromotionQueen)
{
if (capturePieceType != PieceType.None)
{
RemovePiece(colour.Opposite(), toSquare);
}
MovePiece(colour, pieceType, fromSquare, toSquare);
PromotePiece(colour, PieceType.Queen, toSquare);
}
else if (moveType == MoveType.PromotionRook)
{
if (capturePieceType != PieceType.None)
{
RemovePiece(colour.Opposite(), toSquare);
}
MovePiece(colour, pieceType, fromSquare, toSquare);
PromotePiece(colour, PieceType.Rook, toSquare);
}
else if (moveType == MoveType.PromotionBishop)
{
if (capturePieceType != PieceType.None)
{
RemovePiece(colour.Opposite(), toSquare);
}
MovePiece(colour, pieceType, fromSquare, toSquare);
PromotePiece(colour, PieceType.Bishop, toSquare);
}
else if (moveType == MoveType.PromotionKnight)
{
if (capturePieceType != PieceType.None)
{
RemovePiece(colour.Opposite(), toSquare);
}
MovePiece(colour, pieceType, fromSquare, toSquare);
PromotePiece(colour, PieceType.Knight, toSquare);
}
else if (pieceType == PieceType.Pawn)
{
// We can only move forward two from start square
var toSquareTemp = fromSquare.PawnForward(colour, 2);
// So if the 'to' square is the same it might set en passant flag
if (toSquareTemp == toSquare)
{
var targetSquare = (SquareFlag)((ulong)toSquare >> Math.Abs((int)MoveDirection.West));
var targetPiece = PieceMapHelpers.GetPiece(this, targetSquare);
if (targetPiece.Colour == colour.Opposite() && targetPiece.Type == PieceType.Pawn)
{
enPassantSquare = fromSquare.PawnForward(colour, 1);
}
else
{
targetSquare = (SquareFlag)((ulong)toSquare << (int)MoveDirection.East);
targetPiece = PieceMapHelpers.GetPiece(this, targetSquare);
if (targetPiece.Colour == colour.Opposite() && targetPiece.Type == PieceType.Pawn)
{
enPassantSquare = fromSquare.PawnForward(colour, 1);
}
}
}
MovePiece(colour, pieceType, fromSquare, toSquare);
if (capturePieceType != PieceType.None)
{
RemovePiece(colour.Opposite(), toSquare);
}
}
else
{
MovePiece(colour, pieceType, fromSquare, toSquare);
if (pieceType == PieceType.Rook)
{
if (colour == Colour.White)
{
if (fromSquare == SquareFlagConstants.WhiteKingSideRookStartSquare)
{
state = RemoveCastleAvailability(colour, MoveType.CastleKing, state);
}
else if (fromSquare == SquareFlagConstants.WhiteQueenSideRookStartSquare)
{
state = RemoveCastleAvailability(colour, MoveType.CastleQueen, state);
}
}
else
{
if (fromSquare == SquareFlagConstants.BlackKingSideRookStartSquare)
{
state = RemoveCastleAvailability(colour, MoveType.CastleKing, state);
}
else if (fromSquare == SquareFlagConstants.BlackQueenSideRookStartSquare)
{
state = RemoveCastleAvailability(colour, MoveType.CastleQueen, state);
}
}
}
else if (pieceType == PieceType.King)
{
state = RemoveCastleAvailability(colour, state);
}
if (capturePieceType != PieceType.None)
{
RemovePiece(colour.Opposite(), toSquare);
if (capturePieceType == PieceType.Rook)
{
if (colour == Colour.White)
{
if (toSquare == SquareFlagConstants.BlackKingSideRookStartSquare)
{
state = RemoveCastleAvailability(Colour.Black, MoveType.CastleKing, state);
}
else if (toSquare == SquareFlagConstants.BlackQueenSideRookStartSquare)
{
state = RemoveCastleAvailability(Colour.Black, MoveType.CastleQueen, state);
}
}
else
{
if (toSquare == SquareFlagConstants.WhiteKingSideRookStartSquare)
{
state = RemoveCastleAvailability(Colour.White, MoveType.CastleKing, state);
}
else if (toSquare == SquareFlagConstants.WhiteQueenSideRookStartSquare)
{
state = RemoveCastleAvailability(Colour.White, MoveType.CastleQueen, state);
}
}
}
}
}
Key = keyGen.UpdateHash(Key, move);
var historyItem = new BoardStateInfo(Key, move, state, enPassantSquare);
history.Push(historyItem);
}