public void ExecuteMove(Move move)
{
move.Execute(Board);
PastMoves.Push(move);
CheckPawnPromotion();
ChangeTurns();
}
// read a board state and select a suitable move to return
public string SelectMove(string fen)
{
var Board = new Board(fen); // load the board
// store the enemy's last move
if (LastBoard != null)
{
var LastMove = BoardDiff(LastBoard, Board);
if (LastMove == null)
{
throw new Exception("could not determine last move using a board diff");
}
if (PastMoves.Count == 8)
{
PastMoves.Dequeue();
}
PastMoves.Enqueue(LastMove);
}
// assign engine's past moves to the board and search for the best move
Board.PastMoves = PastMoves;
MoveGen.MoveBoardPair Mbp = Searcher.Search(Board, Depth, QuiescentDepth, Alpha, Beta, MoveTimeLimit);
LastBoard = Mbp.Board;
return(Mbp.Move.ToString());
}
private void CheckPawnCaptures(Move move, List <Move> movesToRemove, List <Move> movesToAdd)
{
// Check For Capture
if (move.Destination.X != move.Origin.X)
{
// No Past Moves Means It Can't Be En Passant Or Capture
if (PastMoves.Count == 0)
{
movesToRemove.Add(move);
Board.GetPieceAt(move.Origin).ValidMoves.Remove(move);
}
// Check For En Passant
else if (Board.GetPieceAt(move.Destination) == null)
{
Move lastMove = PastMoves.Peek();
// Last Piece Moved Isn't A Pawn Or It Had Been Previously Moved
if (lastMove.Moved.Type != PieceType.Pawn || lastMove.Moved.HasMoved)
{
movesToRemove.Add(move);
Board.GetPieceAt(move.Origin).ValidMoves.Remove(move);
}
// Last Piece Moved Isn't In Correct Position For En Passant
else if (lastMove.Destination.X != move.Destination.X ||
lastMove.Destination.Y != move.Origin.Y)
{
movesToRemove.Add(move);
Board.GetPieceAt(move.Origin).ValidMoves.Remove(move);
}
// Move Is En Passant
else
{
movesToRemove.Add(move);
Board.GetPieceAt(move.Origin).ValidMoves.Remove(move);
Move enpassant = new EnPassantMove(move.Moved, move.Origin, move.Destination,
Board.GetPieceAt(new Position(move.Destination.X, move.Origin.Y)));
movesToAdd.Add(enpassant);
Board.GetPieceAt(enpassant.Origin).ValidMoves.Add(enpassant);
}
}
// Can't Attack Own Piece
else if (Board.GetPieceAt(move.Destination).Color == move.Moved.Color)
{
movesToRemove.Add(move);
Board.GetPieceAt(move.Origin).ValidMoves.Remove(move);
}
}
}
