private void AddMove(ICollection <Move> moves, Piece piece, Square from, Square to, Piece promoted, EMoveType type = EMoveType.Quiet)
{
Move move;
if (type.HasFlagFast(EMoveType.Capture))
{
move = new Move(piece, Position.GetPiece(to), from, to, type, promoted);
}
else if (type.HasFlagFast(EMoveType.Epcapture))
{
move = new Move(piece, EPieceType.Pawn.MakePiece(~SideToMove), from, to, type, promoted);
}
else
{
move = new Move(piece, from, to, type, promoted);
}
// check if move is actual a legal move if the flag is enabled
if (Flags.HasFlagFast(Emgf.Legalmoves) && !IsLegal(move, piece, from, type))
{
return;
}
moves.Add(move);
}
private static void AddMove(this IPosition pos, MoveList moves, Piece piece, Square from, Square to, Piece promoted, Emgf flags, EMoveType type = EMoveType.Quiet)
{
Move move;
if (type.HasFlagFast(EMoveType.Capture))
{
move = new Move(piece, pos.GetPiece(to), from, to, type, promoted);
}
else if (type.HasFlagFast(EMoveType.Epcapture))
{
move = new Move(piece, EPieceType.Pawn.MakePiece(~pos.State.SideToMove), from, to, type, promoted);
}
else
{
move = new Move(piece, from, to, type, promoted);
}
// check if move is actual a legal move if the flag is enabled
if (flags.HasFlagFast(Emgf.Legalmoves) && !pos.IsLegal(move, piece, from, type))
{
return;
}
moves.Add(move);
}
/// <summary>
/// Determine if a move is legal or not, by performing the move and checking if the king is under attack afterwards.
/// </summary>
/// <param name="move">The move to check</param>
/// <param name="piece">The moving piece</param>
/// <param name="from">The from square</param>
/// <param name="type">The move type</param>
/// <returns>true if legal, otherwise false</returns>
public bool IsLegal(Move move, Piece piece, Square from, EMoveType type)
{
if (!InCheck && piece.Type() != EPieceType.King && (Pinned & from).Empty() && !type.HasFlagFast(EMoveType.Epcapture))
{
return(true);
}
Position.IsProbing = true;
Position.MakeMove(move);
var opponentAttacking = Position.IsAttacked(Position.KingSquares[SideToMove.Side], ~SideToMove);
Position.TakeMove(move);
Position.IsProbing = false;
return(!opponentAttacking);
}
