private static ChessBoard PerformBlackPawnCapture(ChessBoard board, string notation, ChessBoard tempboard)
{
char pawnfile = notation[0];
char enemyfile = notation[1];
sbyte enemyrank = (sbyte)Char.GetNumericValue(notation[2]);
sbyte pawnrank = (sbyte)(enemyrank + 1);
if (board[pawnfile, pawnrank] != -1)
{
throw new ArgumentException("wrong notation");
}
tempboard[pawnfile, pawnrank] = 0;
if (DefaultInfo.WhiteEnPassantEndangered && enemyfile == DefaultInfo.EnPassantPossibleCapture.file && enemyrank == DefaultInfo.EnPassantPossibleCapture.rank)
{
tempboard[enemyfile, enemyrank + 1] = 0;
}
if (notation.Length == 3)
{
tempboard[enemyfile, enemyrank] = (sbyte)DefaultPieces.BlackPawn;
}
else
{
tempboard[enemyfile, enemyrank] = GetSbyteFromBlackPieceLetter(notation[3]);
}
if (BlackPawn.GetPossiblePositions(board, pawnfile, pawnrank).Contains(tempboard))
{
return(tempboard);
}
else
{
throw new ArgumentException("Wrong move");
}
}
private static ChessBoard PerformBlackPawnMove(ChessBoard board, string notation, ChessBoard tempboard)
{
//simple move (not 5 rank) and promotion
if (notation[1] != '5')
{
sbyte pawnrank = (sbyte)(Char.GetNumericValue(notation[1]) + 1);
char pawnfile = notation[0];
if (board[pawnfile, pawnrank] != (sbyte)DefaultPieces.BlackPawn)
{
throw new ArgumentException("wrong move");
}
tempboard[pawnfile, pawnrank] = 0;
if (notation.Length == 2)
{
tempboard[pawnfile, pawnrank - 1] = (sbyte)DefaultPieces.BlackPawn;
}
else
{
tempboard[pawnfile, pawnrank - 1] = GetSbyteFromBlackPieceLetter(notation[2]);
}
if (BlackPawn.GetPossiblePositions(board, pawnfile, pawnrank).Contains(tempboard))
{
return(tempboard);
}
else
{
throw new ArgumentException("Wrong move");
}
}
//simple move (5 rank)
else
{
char pawnfile = notation[0];
sbyte pawnrank;
if (board[pawnfile, (sbyte)(Char.GetNumericValue(notation[1]) + 1)] == (sbyte)DefaultPieces.BlackPawn)
{
pawnrank = (sbyte)(Char.GetNumericValue(notation[1]) + 1);
}
else if (board[pawnfile, (sbyte)(Char.GetNumericValue(notation[1]) + 2)] == (sbyte)DefaultPieces.BlackPawn && board[pawnfile, (sbyte)(Char.GetNumericValue(notation[1]) + 1)] == 0)
{
pawnrank = (sbyte)(Char.GetNumericValue(notation[1]) + 2);
}
else
{
throw new ArgumentException("Wrong move");
}
tempboard[pawnfile, pawnrank] = 0;
tempboard[pawnfile, (sbyte)Char.GetNumericValue(notation[1])] = (sbyte)DefaultPieces.BlackPawn;
if (BlackPawn.GetPossiblePositions(board, pawnfile, pawnrank).Contains(tempboard))
{
//en passant
if (pawnrank == (sbyte)(Char.GetNumericValue(notation[1]) + 2))
{
DefaultInfo.EnPassantPossibleCapture = new Square(notation[0], (sbyte)(Char.GetNumericValue(notation[1]) + 1));
DefaultInfo.BlackEnPassantEndangered = true;
}
return(tempboard);
}
else
{
throw new ArgumentException("Wrong move");
}
}
}