public static long[] GetKey(Board board)
{
long[] key = new long[] { 0, 0 };
long square = BitboardUtils.H1;
byte index = 0;
int color = 0;
while (square != 0)
{
color = (square & board.whites) != 0 ? 0 : 1;
key[color] ^= GetKeyPieceIndex(index, board.GetPieceAt(square));
square <<= 1;
index++;
}
if (board.GetWhiteKingsideCastling())
{
key[0] ^= whiteKingSideCastling;
}
if (board.GetWhiteQueensideCastling())
{
key[0] ^= whiteQueenSideCastling;
}
if (board.GetBlackKingsideCastling())
{
key[1] ^= blackKingSideCastling;
}
if (board.GetBlackQueensideCastling())
{
key[1] ^= blackQueenSideCastling;
}
// passant flags only when pawn can capture
long passant = board.GetPassantSquare();
if ((passant != 0) && (((!board.GetTurn() && (((passant << 9) | (passant << 7)) &
board.blacks & board.pawns) != 0)) || ((board.GetTurn() && ((((long)(((ulong)passant
) >> 9)) | ((long)(((ulong)passant) >> 7))) & board.whites & board.pawns) != 0))
))
{
color = board.GetTurn() ? 0 : 1;
// TODO test
key[1 - color] ^= passantColumn[BitboardUtils.GetColumn(passant)];
}
if (board.GetTurn())
{
key[0] ^= whiteMove;
}
return key;
}
