public static int getFirstLegalMove(string moves, ulong WP, ulong WN, ulong WB, ulong WR, ulong WQ, ulong WK, ulong BP, ulong BN, ulong BB, ulong BR, ulong BQ, ulong BK, ulong EP, bool CWK, bool CWQ, bool CBK, bool CBQ, bool WhiteToMove)
{
for (int i = 0; i < moves.Length; i += 4)
{
ulong WPt = Moves.makeMove(WP, moves.Substring(i, 4), 'P'), WNt = Moves.makeMove(WN, moves.Substring(i, 4), 'N'),
WBt = Moves.makeMove(WB, moves.Substring(i, 4), 'B'), WRt = Moves.makeMove(WR, moves.Substring(i, 4), 'R'),
WQt = Moves.makeMove(WQ, moves.Substring(i, 4), 'Q'), WKt = Moves.makeMove(WK, moves.Substring(i, 4), 'K'),
BPt = Moves.makeMove(BP, moves.Substring(i, 4), 'p'), BNt = Moves.makeMove(BN, moves.Substring(i, 4), 'n'),
BBt = Moves.makeMove(BB, moves.Substring(i, 4), 'b'), BRt = Moves.makeMove(BR, moves.Substring(i, 4), 'r'),
BQt = Moves.makeMove(BQ, moves.Substring(i, 4), 'q'), BKt = Moves.makeMove(BK, moves.Substring(i, 4), 'k');
WRt = Moves.makeMoveCastle(WRt, WK | BK, moves.Substring(i, 4), 'R');
BRt = Moves.makeMoveCastle(BRt, WK | BK, moves.Substring(i, 4), 'r');
if (((WKt & Moves.unSafeForWhite(WPt, WNt, WBt, WRt, WQt, WKt, BPt, BNt, BBt, BRt, BQt, BKt)) == 0 && WhiteToMove) ||
((BKt & Moves.unSafeForBlack(WPt, WNt, WBt, WRt, WQt, WKt, BPt, BNt, BBt, BRt, BQt, BKt)) == 0 && !WhiteToMove))
{
return(i);
}
}
return(-1);
}
public static void perft(ulong WP, ulong WN, ulong WB, ulong WR, ulong WQ, ulong WK, ulong BP, ulong BN, ulong BB, ulong BR, ulong BQ, ulong BK, ulong EP, bool CWK, bool CWQ, bool CBK, bool CBQ, bool WhiteToMove, int depth)
{
if (depth < perftMaxDepth)
{
string moves;
if (WhiteToMove)
{
moves = Moves.possibleMovesW(WP, WN, WB, WR, WQ, WK, BP, BN, BB, BR, BQ, BK, EP, CWK, CWQ, CBK, CBQ);
}
else
{
moves = Moves.possibleMovesB(WP, WN, WB, WR, WQ, WK, BP, BN, BB, BR, BQ, BK, EP, CWK, CWQ, CBK, CBQ);
}
for (int i = 0; i < moves.Length; i += 4)
{
ulong WPt = Moves.makeMove(WP, moves.Substring(i, 4), 'P'), WNt = Moves.makeMove(WN, moves.Substring(i, 4), 'N'),
WBt = Moves.makeMove(WB, moves.Substring(i, 4), 'B'), WRt = Moves.makeMove(WR, moves.Substring(i, 4), 'R'),
WQt = Moves.makeMove(WQ, moves.Substring(i, 4), 'Q'), WKt = Moves.makeMove(WK, moves.Substring(i, 4), 'K'),
BPt = Moves.makeMove(BP, moves.Substring(i, 4), 'p'), BNt = Moves.makeMove(BN, moves.Substring(i, 4), 'n'),
BBt = Moves.makeMove(BB, moves.Substring(i, 4), 'b'), BRt = Moves.makeMove(BR, moves.Substring(i, 4), 'r'),
BQt = Moves.makeMove(BQ, moves.Substring(i, 4), 'q'), BKt = Moves.makeMove(BK, moves.Substring(i, 4), 'k'),
EPt = Moves.makeMoveEP(WP | BP, moves.Substring(i, 4));
WRt = Moves.makeMoveCastle(WRt, WK | BK, moves.Substring(i, 4), 'R');
BRt = Moves.makeMoveCastle(BRt, WK | BK, moves.Substring(i, 4), 'r');
bool CWKt = CWK, CWQt = CWQ, CBKt = CBK, CBQt = CBQ;
if (char.IsDigit(moves[i + 3]))
{//'regular' move
int start = (int)(char.GetNumericValue(moves[i]) * 8) + (int)(char.GetNumericValue(moves[i + 1]));
/*if (((1ul<<start)&(WP|BP))!=0) {
* if (Math.abs(moves[i)-moves[i+2))==2) {
* EPt=Moves.FileMasks8[moves[i+1)-'0'];
* }
* }
* else */
if (((1ul << start) & WK) != 0)
{
CWKt = false; CWQt = false;
}
else if (((1ul << start) & BK) != 0)
{
CBKt = false; CBQt = false;
}
else if (((1ul << start) & WR & (1ul << 63)) != 0)
{
CWKt = false;
}
else if (((1ul << start) & WR & (1ul << 56)) != 0)
{
CWQt = false;
}
else if (((1ul << start) & BR & (1ul << 7)) != 0)
{
CBKt = false;
}
else if (((1ul << start) & BR & 1ul) != 0)
{
CBQt = false;
}
}
if (((WKt & Moves.unSafeForWhite(WPt, WNt, WBt, WRt, WQt, WKt, BPt, BNt, BBt, BRt, BQt, BKt)) == 0 && WhiteToMove) ||
((BKt & Moves.unSafeForBlack(WPt, WNt, WBt, WRt, WQt, WKt, BPt, BNt, BBt, BRt, BQt, BKt)) == 0 && !WhiteToMove))
{
if (depth + 1 == perftMaxDepth)
{
perftMoveCounter++;
}
perft(WPt, WNt, WBt, WRt, WQt, WKt, BPt, BNt, BBt, BRt, BQt, BKt, EPt, CWKt, CWQt, CBKt, CBQt, !WhiteToMove, depth + 1);
}
}
}
}
