private static Colour GetPieceColour(IPieceMap board, SquareFlag square)
{
if (board.White.HasFlag(square))
{
return(Colour.White);
}
if (board.Black.HasFlag(square))
{
return(Colour.Black);
}
return(Colour.None);
}
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 static Piece GetPiece(IPieceMap board, SquareFlag square)
{
var colour = GetPieceColour(board, square);
if (colour == Colour.None)
{
return(new Piece(colour, PieceType.None));
}
if (colour == Colour.White)
{
if (board.WhitePawns.HasFlag(square))
{
return(new Piece(colour, PieceType.Pawn));
}
if (board.WhiteRooks.HasFlag(square))
{
return(new Piece(colour, PieceType.Rook));
}
if (board.WhiteKnights.HasFlag(square))
{
return(new Piece(colour, PieceType.Knight));
}
if (board.WhiteBishops.HasFlag(square))
{
return(new Piece(colour, PieceType.Bishop));
}
if (board.WhiteQueens.HasFlag(square))
{
return(new Piece(colour, PieceType.Queen));
}
if (board.WhiteKing.HasFlag(square))
{
return(new Piece(colour, PieceType.King));
}
}
else
{
if (board.BlackPawns.HasFlag(square))
{
return(new Piece(colour, PieceType.Pawn));
}
if (board.BlackRooks.HasFlag(square))
{
return(new Piece(colour, PieceType.Rook));
}
if (board.BlackKnights.HasFlag(square))
{
return(new Piece(colour, PieceType.Knight));
}
if (board.BlackBishops.HasFlag(square))
{
return(new Piece(colour, PieceType.Bishop));
}
if (board.BlackQueens.HasFlag(square))
{
return(new Piece(colour, PieceType.Queen));
}
if (board.BlackKing.HasFlag(square))
{
return(new Piece(colour, PieceType.King));
}
}
throw new Exception($"Failed to find piece for {square}");
}