public bool ProbeScore(ZobristHash hash, int alpha, int beta, int depth, ref int score)
{
int i = CalculateHashIndex(hash);
if (m_hashTable[i].Flag != AlphaBetaFlag.NoScore && hash.Equals(m_hashTable[i].Hash))
{
if (m_hashTable[i].Depth >= depth)
{
if (m_hashTable[i].Flag == AlphaBetaFlag.ExactScore)
{
score = m_hashTable[i].Score;
return true;
}
if (m_hashTable[i].Flag == AlphaBetaFlag.AlphaScore && m_hashTable[i].Score <= alpha)
{
score = alpha;
return true;
}
if (m_hashTable[i].Flag == AlphaBetaFlag.BetaScore && m_hashTable[i].Score >= beta)
{
score = beta;
return true;
}
}
}
return false;
}
/// <summary>
/// Adds a board to the history. If the board already exists the frequency is increased.
/// </summary>
/// <param name="board">Board to add.</param>
public void AddBoard(Board board)
{
int count;
ZobristHash hash = board.BoardHash(true);
m_gameHashHistory.TryGetValue(hash, out count);
m_gameHashHistory[hash] = count + 1;
}
public MoveIdentifier ProbePvMove(ZobristHash hash)
{
int i = CalculateHashIndex(hash);
if (m_hashTable[i].Flag != AlphaBetaFlag.NoScore && hash.Equals(m_hashTable[i].Hash))
return m_hashTable[i].PvMove;
else
return new MoveIdentifier(Square.None, Square.None, Piece.None);
}
/// <summary>
/// Compares this instance of a zobrist hash to a given object.
/// </summary>
/// <param name="obj">The object to compare this instance to.</param>
/// <returns>Returns true if the two instances are equal.</returns>
public override bool Equals(object obj)
{
ZobristHash hash = (ZobristHash)obj;
if (hash == null)
{
return(false);
}
else
{
return(m_key == hash.m_key && m_lock == hash.m_lock);
}
}
/// <summary>
/// Removes a board from the history. If the frequency for
/// the board is larger then one the frequency is decreased.
/// </summary>
/// <param name="board">Board to remove.</param>
public void RemoveBoard(Board board)
{
int count;
ZobristHash hash = board.BoardHash(true);
m_gameHashHistory.TryGetValue(hash, out count);
if (count > 1)
{
m_gameHashHistory[hash] = count - 1;
}
else
{
m_gameHashHistory.Remove(hash);
}
}
public Board(Board board)
{
m_squares = new Piece[board.m_squares.Length];
for (int i = 0; i < m_squares.Length; ++i)
{
m_squares[i] = board.m_squares[i];
}
m_state = board.m_state;
m_history = new HashHistory(board.m_history);
m_pieceFactory = FlyweightPieceFactory.Instance();
m_whiteLocationList = new PieceLocationManager(board.m_whiteLocationList);
m_blackLocationList = new PieceLocationManager(board.BlackPieceLocations);
m_whiteKingLocation = board.m_whiteKingLocation;
m_blackKingLocation = board.m_blackKingLocation;
m_boardHash = new ZobristHash(board.m_boardHash);
}
/// <summary>
/// Initializes a new instance of a Zobrist hash identical in value to the passed Zobrist hash.
/// </summary>
/// <param name="zobristHash">The ZobristHash to clone.</param>
public ZobristHash(ZobristHash zobristHash)
{
m_key = zobristHash.m_key;
m_lock = zobristHash.m_lock;
}
public void Load()
{
try
{
if (File.Exists(OPENING_BOOK_FILE))
{
FileStream fs = new FileStream(OPENING_BOOK_FILE, FileMode.Open);
BinaryReader br = new BinaryReader(fs);
while (br.BaseStream.Position < br.BaseStream.Length)
{
int keyVal = br.ReadInt32();
int lockVal = br.ReadInt32();
int queryVal = br.ReadInt32();
ZobristHash zobristHash = new ZobristHash(keyVal, lockVal);
m_positionTable[zobristHash] = queryVal;
}
br.Close();
fs.Close();
OutputWriter.Write(m_positionTable.Count.ToString() + " opening moves loaded");
}
}
catch (Exception e)
{
OutputWriter.Write("Exception thrown when loading book: " + e.ToString());
}
}
private static int CalculateHashIndex(ZobristHash hash)
{
return hash.GetHashCode() & (TABLE_SIZE - 1);
}
public void RecordHash(ZobristHash hash, AlphaBetaFlag flag, int depth, int score, Move pvMove)
{
if (!m_closed)
{
int i = CalculateHashIndex(hash);
m_hashTable[i].Hash.Key = hash.Key;
m_hashTable[i].Hash.Lock = hash.Lock;
m_hashTable[i].Flag = flag;
m_hashTable[i].Depth = depth;
m_hashTable[i].Score = score;
if (pvMove != null)
{
m_hashTable[i].PvMove.From = pvMove.From;
m_hashTable[i].PvMove.To = pvMove.To;
m_hashTable[i].PvMove.PromotionPiece = pvMove.PromoteTo;
}
else
{
m_hashTable[i].PvMove.From = Square.None;
m_hashTable[i].PvMove.To = Square.None;
m_hashTable[i].PvMove.PromotionPiece = Piece.None;
}
}
}
/// <summary>
/// Initializes a new instance of a Zobrist hash identical in value to the passed Zobrist hash.
/// </summary>
/// <param name="zobristHash">The ZobristHash to clone.</param>
public ZobristHash(ZobristHash zobristHash)
{
m_key = zobristHash.m_key;
m_lock = zobristHash.m_lock;
}
public void RecordHash(ZobristHash hash, QuiescentFlag flag, int score)
{
if (!m_closed)
{
int i = CalculateHashIndex(hash);
m_hashTable[i].Hash.Key = hash.Key;
m_hashTable[i].Hash.Lock = hash.Lock;
m_hashTable[i].Flag = flag;
m_hashTable[i].Score = score;
}
}
public Board(Board board)
{
m_squares = new Piece[board.m_squares.Length];
for (int i = 0; i < m_squares.Length; ++i)
m_squares[i] = board.m_squares[i];
m_state = board.m_state;
m_history = new HashHistory(board.m_history);
m_pieceFactory = FlyweightPieceFactory.Instance();
m_whiteLocationList = new PieceLocationManager(board.m_whiteLocationList);
m_blackLocationList = new PieceLocationManager(board.BlackPieceLocations);
m_whiteKingLocation = board.m_whiteKingLocation;
m_blackKingLocation = board.m_blackKingLocation;
m_boardHash = new ZobristHash(board.m_boardHash);
}
/// <summary>
/// Initializes a new instance of Board ready to be played on
/// and with pieces put on their initial locations.
/// </summary>
public Board()
{
//we make board twice as big as we use the 0x88 scheme for representing the board
m_squares = new Piece[NOF_SQUARS];
for (int i = 0; i < m_squares.Length; ++i)
m_squares[i] = Piece.None;
m_squares[(int)Square.A1] = Piece.WhiteRook;
m_squares[(int)Square.B1] = Piece.WhiteKnight;
m_squares[(int)Square.C1] = Piece.WhiteBishop;
m_squares[(int)Square.D1] = Piece.WhiteQueen;
m_squares[(int)Square.E1] = Piece.WhiteKing;
m_squares[(int)Square.F1] = Piece.WhiteBishop;
m_squares[(int)Square.G1] = Piece.WhiteKnight;
m_squares[(int)Square.H1] = Piece.WhiteRook;
m_squares[(int)Square.A2] = Piece.WhitePawn;
m_squares[(int)Square.B2] = Piece.WhitePawn;
m_squares[(int)Square.C2] = Piece.WhitePawn;
m_squares[(int)Square.D2] = Piece.WhitePawn;
m_squares[(int)Square.E2] = Piece.WhitePawn;
m_squares[(int)Square.F2] = Piece.WhitePawn;
m_squares[(int)Square.G2] = Piece.WhitePawn;
m_squares[(int)Square.H2] = Piece.WhitePawn;
m_squares[(int)Square.A7] = Piece.BlackPawn;
m_squares[(int)Square.B7] = Piece.BlackPawn;
m_squares[(int)Square.C7] = Piece.BlackPawn;
m_squares[(int)Square.D7] = Piece.BlackPawn;
m_squares[(int)Square.E7] = Piece.BlackPawn;
m_squares[(int)Square.F7] = Piece.BlackPawn;
m_squares[(int)Square.G7] = Piece.BlackPawn;
m_squares[(int)Square.H7] = Piece.BlackPawn;
m_squares[(int)Square.A8] = Piece.BlackRook;
m_squares[(int)Square.B8] = Piece.BlackKnight;
m_squares[(int)Square.C8] = Piece.BlackBishop;
m_squares[(int)Square.D8] = Piece.BlackQueen;
m_squares[(int)Square.E8] = Piece.BlackKing;
m_squares[(int)Square.F8] = Piece.BlackBishop;
m_squares[(int)Square.G8] = Piece.BlackKnight;
m_squares[(int)Square.H8] = Piece.BlackRook;
m_state.ColorToPlay = PieceColor.White;
m_state.WhiteCanCastleShort = true;
m_state.WhiteCanCastleLong = true;
m_state.BlackCanCastleShort = true;
m_state.BlackCanCastleLong = true;
m_state.EnPassantTarget = Square.None;
m_state.NonHitAndPawnMovesPlayed = 0;
m_history = new HashHistory();
m_pieceFactory = FlyweightPieceFactory.Instance();
m_whiteLocationList = new PieceLocationManager();
m_blackLocationList = new PieceLocationManager();
foreach (Square square in this)
{
if (GetPieceColor(square) == PieceColor.White)
m_whiteLocationList.PlacePiece(square);
if (GetPieceColor(square) == PieceColor.Black)
m_blackLocationList.PlacePiece(square);
}
m_whiteKingLocation = Square.E1;
m_blackKingLocation = Square.E8;
m_boardHash = new ZobristHash(this);
AddToHistory();
}
/// <summary>
/// Initializes a new instance of Board ready to be played on
/// and with pieces put on their initial locations.
/// </summary>
public Board()
{
//we make board twice as big as we use the 0x88 scheme for representing the board
m_squares = new Piece[NOF_SQUARS];
for (int i = 0; i < m_squares.Length; ++i)
{
m_squares[i] = Piece.None;
}
m_squares[(int)Square.A1] = Piece.WhiteRook;
m_squares[(int)Square.B1] = Piece.WhiteKnight;
m_squares[(int)Square.C1] = Piece.WhiteBishop;
m_squares[(int)Square.D1] = Piece.WhiteQueen;
m_squares[(int)Square.E1] = Piece.WhiteKing;
m_squares[(int)Square.F1] = Piece.WhiteBishop;
m_squares[(int)Square.G1] = Piece.WhiteKnight;
m_squares[(int)Square.H1] = Piece.WhiteRook;
m_squares[(int)Square.A2] = Piece.WhitePawn;
m_squares[(int)Square.B2] = Piece.WhitePawn;
m_squares[(int)Square.C2] = Piece.WhitePawn;
m_squares[(int)Square.D2] = Piece.WhitePawn;
m_squares[(int)Square.E2] = Piece.WhitePawn;
m_squares[(int)Square.F2] = Piece.WhitePawn;
m_squares[(int)Square.G2] = Piece.WhitePawn;
m_squares[(int)Square.H2] = Piece.WhitePawn;
m_squares[(int)Square.A7] = Piece.BlackPawn;
m_squares[(int)Square.B7] = Piece.BlackPawn;
m_squares[(int)Square.C7] = Piece.BlackPawn;
m_squares[(int)Square.D7] = Piece.BlackPawn;
m_squares[(int)Square.E7] = Piece.BlackPawn;
m_squares[(int)Square.F7] = Piece.BlackPawn;
m_squares[(int)Square.G7] = Piece.BlackPawn;
m_squares[(int)Square.H7] = Piece.BlackPawn;
m_squares[(int)Square.A8] = Piece.BlackRook;
m_squares[(int)Square.B8] = Piece.BlackKnight;
m_squares[(int)Square.C8] = Piece.BlackBishop;
m_squares[(int)Square.D8] = Piece.BlackQueen;
m_squares[(int)Square.E8] = Piece.BlackKing;
m_squares[(int)Square.F8] = Piece.BlackBishop;
m_squares[(int)Square.G8] = Piece.BlackKnight;
m_squares[(int)Square.H8] = Piece.BlackRook;
m_state.ColorToPlay = PieceColor.White;
m_state.WhiteCanCastleShort = true;
m_state.WhiteCanCastleLong = true;
m_state.BlackCanCastleShort = true;
m_state.BlackCanCastleLong = true;
m_state.EnPassantTarget = Square.None;
m_state.NonHitAndPawnMovesPlayed = 0;
m_history = new HashHistory();
m_pieceFactory = FlyweightPieceFactory.Instance();
m_whiteLocationList = new PieceLocationManager();
m_blackLocationList = new PieceLocationManager();
foreach (Square square in this)
{
if (GetPieceColor(square) == PieceColor.White)
{
m_whiteLocationList.PlacePiece(square);
}
if (GetPieceColor(square) == PieceColor.Black)
{
m_blackLocationList.PlacePiece(square);
}
}
m_whiteKingLocation = Square.E1;
m_blackKingLocation = Square.E8;
m_boardHash = new ZobristHash(this);
AddToHistory();
}
