public static void GeneratePawnMoves(Board board, MovesList movesList)
{
int piece = board.side + pawnBit;
int direction = board.side == white ? boardWidth : -boardWidth;
Func <int, bool> promotionZone;
Func <int, bool> pawnStartZone;
if (board.side == white)
{
promotionZone = (int Square) => Square > (int)H6;
pawnStartZone = (int square) => square < (int)A3;
}
else
{
pawnStartZone = (int Square) => Square > (int)H6;
promotionZone = (int square) => square < (int)A3;
}
for (int i = 0; i < board.pieces[piece].Count; i++)
{
int square = board.pieces[piece][i];
int toSquare = square + direction;
// promotions
if (promotionZone(square))
{
if (board[toSquare] == empty)
{
AddMove.PromotionMove(board, Move.Write(square, toSquare, 0, 0, false, false, false), movesList);
}
//captures
if ((board[toSquare + 1] & border) == enemy)
{
AddMove.PromotionMove(board, Move.Write(square, toSquare + 1, board[toSquare + 1], 0, false, false, false), movesList);
}
if ((board[toSquare - 1] & border) == enemy)
{
AddMove.PromotionMove(board, Move.Write(square, toSquare - 1, board[toSquare - 1], 0, false, false, false), movesList);
}
}
else
{
if (board[toSquare] == empty)
{
AddMove.QuietPawnMove(board, Move.Write(square, toSquare, 0, 0, false, false, false), movesList);
//pawnstart
if (pawnStartZone(square) && (board[toSquare + direction] == empty))
{
AddMove.QuietPawnMove(board, Move.Write(square, toSquare + direction, 0, 0, false, true, false), movesList);
}
}
//captures
if ((board[toSquare + 1] & border) == enemy)
{
AddMove.PawnCaptureMove(board, Move.Write(square, toSquare + 1, board[toSquare + 1], 0, false, false, false), movesList);
}
if ((board[toSquare - 1] & border) == enemy)
{
AddMove.PawnCaptureMove(board, Move.Write(square, toSquare - 1, board[toSquare - 1], 0, false, false, false), movesList);
}
//enpassant
if (toSquare + 1 == board.enpassantSquare)
{
AddMove.EnpassantMove(board, Move.Write(square, board.enpassantSquare, board[board.enpassantSquare], 0, true, false, false), movesList);
}
if (toSquare - 1 == board.enpassantSquare)
{
AddMove.EnpassantMove(board, Move.Write(square, board.enpassantSquare, board[board.enpassantSquare], 0, true, false, false), movesList);
}
}
}
}
