protected override void OnUnMove(int move)
{
if (!MovePackHelper.HasCapture(move))
{
board.ZKey ^= ZKeyForCastling[(int)board.CastlingStatus];
board.CastlingStatus ^= MovePackHelper.GetCastleMask(move);
board.ZKey ^= ZKeyForCastling[(int)board.CastlingStatus];
}
}