private static void GenerateQuietMoves(this IPosition pos, MoveList moves, Emgf flags)
{
var currentSide = pos.State.SideToMove;
var up = currentSide == PlayerExtensions.White ? EDirection.North : EDirection.South;
var notOccupied = ~pos.Pieces();
var pushed = (pos.Pieces(EPieceType.Pawn, currentSide) & ~currentSide.Rank7()).Shift(up) & notOccupied;
pos.AddPawnMoves(moves, pushed, currentSide.PawnPushDistance(), EMoveType.Quiet, flags);
pushed &= currentSide.Rank3();
pos.AddPawnMoves(moves, pushed.Shift(up) & notOccupied, currentSide.PawnDoublePushDistance(), EMoveType.Doublepush, flags);
pos.AddMoves(moves, notOccupied, flags);
if (pos.InCheck)
{
return;
}
for (var castleType = ECastleling.Short; castleType < ECastleling.CastleNb; castleType++)
{
if (pos.CanCastle(castleType))
{
pos.AddCastleMove(moves, pos.GetKingCastleFrom(currentSide, castleType), castleType.GetKingCastleTo(currentSide), flags);
}
}
}
private static void GenerateCapturesAndPromotions(this IPosition pos, MoveList moves, Emgf flags)
{
var currentSide = pos.State.SideToMove;
var them = ~currentSide;
var occupiedByThem = pos.OccupiedBySide[them.Side];
var(northEast, northWest) = currentSide.GetPawnAttackDirections();
var pawns = pos.Pieces(EPieceType.Pawn, currentSide);
pos.AddPawnMoves(moves, currentSide.PawnPush(pawns & currentSide.Rank7()) & ~pos.Pieces(), currentSide.PawnPushDistance(), EMoveType.Quiet, flags);
pos.AddPawnMoves(moves, pawns.Shift(northEast) & occupiedByThem, currentSide.PawnWestAttackDistance(), EMoveType.Capture, flags);
pos.AddPawnMoves(moves, pawns.Shift(northWest) & occupiedByThem, currentSide.PawnEastAttackDistance(), EMoveType.Capture, flags);
if (pos.State.EnPassantSquare != ESquare.none)
{
pos.AddPawnMoves(moves, pawns.Shift(northEast) & pos.State.EnPassantSquare, currentSide.PawnWestAttackDistance(), EMoveType.Epcapture, flags);
pos.AddPawnMoves(moves, pawns.Shift(northWest) & pos.State.EnPassantSquare, currentSide.PawnEastAttackDistance(), EMoveType.Epcapture, flags);
}
pos.AddMoves(moves, occupiedByThem, flags);
}
