Exemplo n.º 1
0
 // get the type of piece at a given board address
 private static PieceMoveType PieceTypeAtAddress(PiecePositions.Player player, BoardAddress address)
 {
     if ((address.Position & player.Pawns) != 0)
     {
         return(PieceMoveType.Pawn);
     }
     else if ((address.Position & player.Knights) != 0)
     {
         return(PieceMoveType.Knight);
     }
     else if ((address.Position & player.Bishops) != 0)
     {
         return(PieceMoveType.Bishop);
     }
     else if ((address.Position & player.Rooks) != 0)
     {
         return(PieceMoveType.Rook);
     }
     else if ((address.Position & player.Queens) != 0)
     {
         return(PieceMoveType.Queen);
     }
     else if ((address.Position & player.King) != 0)
     {
         return(PieceMoveType.King);
     }
     else
     {
         Debug.WriteLine("no piece found at specified position"); return(PieceMoveType.Undefined);
     }
 }
Exemplo n.º 2
0
            // the material value for a given player
            private int MaterialValue(PiecePositions.Player player)
            {
                int Result = 0;

                foreach (ulong pawn in Utilities.BitSplit(player.Pawns))
                {
                    Result += PawnValue;
                }
                foreach (ulong knight in Utilities.BitSplit(player.Knights))
                {
                    Result += KnightValue;
                }
                foreach (ulong bishop in Utilities.BitSplit(player.Knights))
                {
                    Result += BishopValue;
                }
                foreach (ulong rook in Utilities.BitSplit(player.Knights))
                {
                    Result += RookValue;
                }
                foreach (ulong queen in Utilities.BitSplit(player.Knights))
                {
                    Result += QueenValue;
                }
                return(Result);
            }
Exemplo n.º 3
0
        // apply a move to a given board
        internal static Board ApplyMove(Board board, Move move)
        {
            var Result = new Board();

            Result.ActiveColorWhite = board.ActiveColorWhite;

            /// update piece positions ///
            Result.Pieces      = new PiecePositions(board.Pieces);
            Result.Pieces.All &= ~(move.From.Position | move.To.Position);
            PiecePositions.Player ActiveP = Result.ActivePlayer;
            switch (move.MoveType)
            {
            case PieceMoveType.Pawn:
                ActiveP.Pawns |= move.To.Position;
                break;

            case PieceMoveType.Knight:
            case PieceMoveType.PawnKnight:
                ActiveP.Knights |= move.To.Position;
                break;

            case PieceMoveType.Bishop:
            case PieceMoveType.PawnBishop:
                ActiveP.Bishops |= move.To.Position;
                break;

            case PieceMoveType.Rook:
            case PieceMoveType.PawnRook:
                ActiveP.Rooks |= move.To.Position;
                break;

            case PieceMoveType.Queen:
            case PieceMoveType.PawnQueen:
                ActiveP.Queens |= move.To.Position;
                break;

            case PieceMoveType.King:
                ActiveP.King |= move.To.Position;
                break;

            case PieceMoveType.KingQueenside:
                ActiveP.King |= move.To.Position;
                if (board.ActiveColorWhite)
                {
                    ActiveP.Rooks &= ~Masks.WhiteQueenSideRookInitPos;
                    ActiveP.Rooks |= Masks.WhiteQueenSideRookPostCastlePos;
                }
                else
                {
                    ActiveP.Rooks &= ~Masks.BlackQueenSideRookInitPos;
                    ActiveP.Rooks |= Masks.BlackQueenSideRookPostCastlePos;
                }
                break;

            case PieceMoveType.KingKingside:
                ActiveP.King |= move.To.Position;
                if (board.ActiveColorWhite)
                {
                    ActiveP.Rooks &= ~Masks.WhiteKingSideRookInitPos;
                    ActiveP.Rooks |= Masks.WhiteQueenSideRookPostCastlePos;
                }
                else
                {
                    ActiveP.Rooks &= ~Masks.BlackKingSideRookInitPos;
                    ActiveP.Rooks |= Masks.BlackKingSideRookPostCastlePos;
                }
                break;

            default:
                throw new ArgumentException("invalid move type");
            }

            /// update the draw counter ///
            bool PawnMoved      = move.MoveType < PieceMoveType.Knight;
            bool CaptureOccured = (move.To.Position & (board.InactivePlayer.All | board.EnPassantTarget)) != 0;

            if (PawnMoved || CaptureOccured)
            {
                Result.HalfMoveClock = 0;                              // reset
            }
            else
            {
                Result.HalfMoveClock = (byte)(board.HalfMoveClock + 1);  // increment
            }
            /// check for en passant target ///
            if (PawnMoved && (move.From.Position & Masks.Ranks27) != 0)
            {
                if (board.ActiveColorWhite && ((move.From.Position << 16) & move.To.Position) != 0)
                {
                    Result.EnPassantTarget = move.From.Position << 8;
                }
                else if (!board.ActiveColorWhite && ((move.From.Position >> 16) & move.To.Position) != 0)
                {
                    Result.EnPassantTarget = move.From.Position >> 8;
                }
            }

            /// update castling availability ///
            // copy the availablity of the inactive player and store the past availablity for the active player
            Result.CastlingAvailability = new Board.Castling();
            Board.Castling.Move PastActiveCastlingStatus, NewActiveCastlingStatus;
            if (board.ActiveColorWhite)
            {
                Result.CastlingAvailability.Black = board.CastlingAvailability.Black;
                PastActiveCastlingStatus          = board.CastlingAvailability.White;
            }
            else
            {
                Result.CastlingAvailability.White = board.CastlingAvailability.White;
                PastActiveCastlingStatus          = board.CastlingAvailability.Black;
            }

            // was castling already disallowed or did the king just move?
            if (PastActiveCastlingStatus == Board.Castling.Move.Disallowed || (move.MoveType >= PieceMoveType.King))   // yes
            {
                NewActiveCastlingStatus = Board.Castling.Move.Disallowed;
            }
            else     // no
            {
                switch (PastActiveCastlingStatus)
                {
                case Board.Castling.Move.KingSide:
                    if (KingSideRookMoved(board))
                    {
                        NewActiveCastlingStatus = Board.Castling.Move.Disallowed;
                    }
                    else
                    {
                        NewActiveCastlingStatus = Board.Castling.Move.KingSide;
                    }
                    break;

                case Board.Castling.Move.QueenSide:
                    if (QueenSideRookMoved(board))
                    {
                        NewActiveCastlingStatus = Board.Castling.Move.Disallowed;
                    }
                    else
                    {
                        NewActiveCastlingStatus = Board.Castling.Move.QueenSide;
                    }
                    break;

                case Board.Castling.Move.BothSides:
                    if (QueenSideRookMoved(board))
                    {
                        NewActiveCastlingStatus = Board.Castling.Move.KingSide;
                    }
                    else if (KingSideRookMoved(board))
                    {
                        NewActiveCastlingStatus = Board.Castling.Move.KingSide;
                    }
                    else
                    {
                        NewActiveCastlingStatus = Board.Castling.Move.BothSides;
                    }
                    break;

                default:
                    throw new Exception(string.Format("invalid castling status \"{0}\"", PastActiveCastlingStatus));
                }

                if (board.ActiveColorWhite)
                {
                    Result.CastlingAvailability.White = NewActiveCastlingStatus;
                }
                else
                {
                    Result.CastlingAvailability.Black = NewActiveCastlingStatus;
                }
            }

            /// update full move counter ///
            if (!board.ActiveColorWhite)
            {
                Result.FullMoveNumber++;                          // on black player's move
            }
            /// switch the active player ///
            Result.ActiveColorWhite = !board.ActiveColorWhite;

            /// update past move tracker ///
            Result.PastMoves = new Queue <Move>(board.PastMoves); // copy references to the past moves
            if (Result.PastMoves.Count == 8)
            {
                Result.PastMoves.Dequeue(); // limit at 8 moves
            }
            Result.PastMoves.Enqueue(move); // add the current move

            return(Result);
        }
Exemplo n.º 4
0
        // create a move from a diff of two boards
        private static Move BoardDiff(Board before, Board after)
        {
            // cache player handles
            PiecePositions.Player ActivePlayerBefore  = before.ActivePlayer;
            PiecePositions.Player InactivePlayerAfter = after.InactivePlayer;

            var Result = new Move();

            /// get the starting positions of the moving pieces ///
            ulong MultiPositions = ActivePlayerBefore.All & ~InactivePlayerAfter.All;

            if (MultiPositions == 0)
            {
                Debug.WriteLine("none of the active player's pieces moved"); return(null);
            }
            bool  TwoPieceFlag      = false;
            ulong RookStartPosition = 0;
            ulong RookEndPosition   = 0;

            ulong[]       Positions = new List <ulong>(Utilities.BitSplit(MultiPositions)).ToArray();
            PieceMoveType FromPiece, ToPiece;

            if (Positions.Length > 2)   // more than two moved pieces
            {
                Debug.WriteLine("more than two pieces moved");
                return(null);
            }
            else if (Positions.Length == 2)     // double piece move (castle)
            {
                TwoPieceFlag = true;

                FromPiece = PieceTypeAtAddress(ActivePlayerBefore, new BoardAddress(Positions[0]));
                if (FromPiece != PieceMoveType.King)
                {
                    if (FromPiece != PieceMoveType.Rook)
                    {
                        Debug.WriteLine("two pieces moved, but a rook was not one of them");
                        return(null);
                    }

                    FromPiece = PieceTypeAtAddress(ActivePlayerBefore, new BoardAddress(Positions[1]));
                    if (FromPiece != PieceMoveType.King)
                    {
                        Debug.WriteLine("two pieces moved, but the king was not one of them"); return(null);
                    }

                    Result.From       = new BoardAddress(Positions[1]);
                    RookStartPosition = Positions[0];
                }
                else
                {
                    if (PieceTypeAtAddress(ActivePlayerBefore, new BoardAddress(Positions[1])) != PieceMoveType.Rook)
                    {
                        Debug.WriteLine("two pieces moved, but a rook was not one of them");
                        return(null);
                    }

                    Result.From       = new BoardAddress(Positions[0]);
                    RookStartPosition = Positions[1];
                }
            }
            else     // single piece moved
            {
                Result.From = new BoardAddress(Positions[0]);
                FromPiece   = PieceTypeAtAddress(ActivePlayerBefore, new BoardAddress(Positions[0]));
            }

            /// get the ending position of the moving piece ///
            MultiPositions = InactivePlayerAfter.All & ~ActivePlayerBefore.All;
            Positions      = new List <ulong>(Utilities.BitSplit(MultiPositions)).ToArray();
            if (MultiPositions == 0)
            {
                Debug.WriteLine("the active player lost a piece on thier turn"); return(null);
            }

            if (Positions.Length > 2)   // more than two pieces moved
            {
                Debug.WriteLine("a piece was added to the board");
                return(null);
            }
            else if (Positions.Length == 2)     // double piece move (castle)
            {
                if (!TwoPieceFlag)
                {
                    Debug.WriteLine("a piece was added to the board"); return(null);
                }

                ToPiece = PieceTypeAtAddress(InactivePlayerAfter, new BoardAddress(Positions[0]));
                if (ToPiece != PieceMoveType.King)
                {
                    if (ToPiece != PieceMoveType.Rook)
                    {
                        Debug.WriteLine("two pieces moved, but a rook was not one of them"); return(null);
                    }
                    ToPiece = PieceTypeAtAddress(InactivePlayerAfter, new BoardAddress(Positions[1]));
                    if (ToPiece != PieceMoveType.King)
                    {
                        Debug.WriteLine("two pieces moved, but the king was not one of them"); return(null);
                    }

                    Result.To       = new BoardAddress(Positions[1]);
                    RookEndPosition = Positions[0];
                }
                else
                {
                    if (PieceTypeAtAddress(InactivePlayerAfter, new BoardAddress(Positions[1])) != PieceMoveType.Rook)
                    {
                        Debug.WriteLine("two pieces moved, but a rook was not one of them");
                        return(null);
                    }

                    Result.To       = new BoardAddress(Positions[0]);
                    RookEndPosition = Positions[1];
                }
            }
            else     // single piece moved
            {
                if (TwoPieceFlag)
                {
                    Debug.WriteLine("the active player lost a piece on thier turn"); return(null);
                }
                Result.To = new BoardAddress(Positions[0]);
                ToPiece   = PieceTypeAtAddress(InactivePlayerAfter, new BoardAddress(Positions[0]));
            }

            Result.MoveType = MoveTypeFromPieceTypes(FromPiece, ToPiece);
            if (TwoPieceFlag)                              // update king move to a castling move
            {
                if (Result.MoveType != PieceMoveType.King) // sanity check
                {
                    Debug.WriteLine("the move indicates a castle, but the king didn't move");
                    return(null);
                }

                if (before.ActiveColorWhite)                                               // white player's move
                {
                    if ((RookStartPosition ^ Masks.WhiteKingSideRookInitPos) == 0)         // king side castle
                    {
                        if ((RookEndPosition ^ Masks.WhiteKingSideRookPostCastlePos) != 0) // does the rook's end position agree?
                        {
                            Debug.WriteLine("the move indicates a kingside castle, but the rook didn't move to its proper position");
                            return(null);
                        }

                        Result.MoveType = PieceMoveType.KingKingside;
                    }
                    else if ((RookStartPosition ^ Masks.WhiteQueenSideRookInitPos) == 0)     // queenside castle
                    {
                        if ((RookEndPosition ^ Masks.WhiteQueenSideRookPostCastlePos) != 0)  // does the rook's end position agree?
                        {
                            Debug.WriteLine("the move indicates a queenside castle, but the rook didn't move to its proper position");
                            return(null);
                        }

                        Result.MoveType = PieceMoveType.KingQueenside;
                    }
                    else     // invalid
                    {
                        Debug.WriteLine("the move indicates a castle, but the rook was not in its proper position");
                        return(null);
                    }
                }
                else                                                                       // black player's move
                {
                    if ((RookStartPosition ^ Masks.BlackKingSideRookInitPos) == 0)         // king side castle
                    {
                        if ((RookEndPosition ^ Masks.BlackKingSideRookPostCastlePos) != 0) // does the rook's end position agree?
                        {
                            Debug.WriteLine("the move indicates a kingside castle, but the rook didn't move to its proper position");
                            return(null);
                        }

                        Result.MoveType = PieceMoveType.KingKingside;
                    }
                    else if ((RookStartPosition ^ Masks.BlackQueenSideRookInitPos) == 0)     // queenside castle
                    {
                        if ((RookEndPosition ^ Masks.BlackQueenSideRookPostCastlePos) != 0)  // does the rook's end position agree?
                        {
                            Debug.WriteLine("the move indicates a queenside castle, but the rook didn't move to its proper position");
                            return(null);
                        }

                        Result.MoveType = PieceMoveType.KingQueenside;
                    }
                    else     // invalid
                    {
                        Debug.WriteLine("the move indicates a castle, but the rook was not in its proper position");
                        return(null);
                    }
                }
            }

            return(Result);
        }