SharpChess/SharpChess.Model/Move.cs at master · TheAppDevelopers/SharpChess · GitHub

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// --------------------------------------------------------------------------------------------------------------------

// <copyright file="Move.cs" company="SharpChess.com">

// SharpChess.com

// </copyright>

// <summary>

// Represents a chess move.

// </summary>

// --------------------------------------------------------------------------------------------------------------------

#region License

// SharpChess

// This program is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

// This program is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License

// along with this program. If not, see <http://www.gnu.org/licenses/>.

#endregion

namespace SharpChess.Model

{

#region Using

using System;

using System.Text;

#endregion

/// <summary>

/// Represents a chess move.

/// </summary>

public class Move : IComparable

{

#region Constructors and Destructors

/// <summary>

/// Initializes a new instance of the <see cref="Move"/> class.

/// </summary>

/// <param name="turnNo">

/// The turn no.

/// </param>

/// <param name="lastMoveTurnNo">

/// The last move turn no.

/// </param>

/// <param name="moveName">

/// The move name.

/// </param>

/// <param name="piece">

/// The piece moving.

/// </param>

/// <param name="from">

/// The square the peice is moving from.

/// </param>

/// <param name="to">

/// The square the peice is moving to.

/// </param>

/// <param name="pieceCaptured">

/// The piece being captured.

/// </param>

/// <param name="pieceCapturedOrdinal">

/// Ordinal position of the piece being captured.

/// </param>

/// <param name="score">

/// The positional score.

/// </param>

public Move(int turnNo, int lastMoveTurnNo, MoveNames moveName, Piece piece, Square from, Square to, Piece pieceCaptured, int pieceCapturedOrdinal, int score)

{

this.EnemyStatus = Player.PlayerStatusNames.Normal;

this.TurnNo = turnNo;

this.LastMoveTurnNo = lastMoveTurnNo;

this.Name = moveName;

this.Piece = piece;

this.From = from;

this.To = to;

this.PieceCaptured = pieceCaptured;

this.PieceCapturedOrdinal = pieceCapturedOrdinal;

this.Score = score;

if (moveName != MoveNames.NullMove && pieceCaptured == null && piece != null && piece.Name != Piece.PieceNames.Pawn)

{

this.FiftyMoveDrawCounter = Game.MoveHistory.Count > 0 ? Game.MoveHistory.Last.FiftyMoveDrawCounter + 1 : (Game.FiftyMoveDrawBase / 2) + 1;

}

#endregion

#region Enums

/// <summary>

/// Move type names.

/// </summary>

public enum MoveNames

{

/// <summary>

/// Standard move.

/// </summary>

Standard,

/// <summary>

/// Castling queen side.

/// </summary>

CastleQueenSide,

/// <summary>

/// Castling king side.

/// </summary>

CastleKingSide,

/// <summary>

/// Pawn promotion to queen.

/// </summary>

PawnPromotionQueen,

/// <summary>

/// Pawn promotion to rook.

/// </summary>

PawnPromotionRook,

/// <summary>

/// Pawn promotion to knight.

/// </summary>

PawnPromotionKnight,

/// <summary>

/// Pawn promotion to bishop.

/// </summary>

PawnPromotionBishop,

/// <summary>

/// En passent move.

/// </summary>

EnPassent,

/// <summary>

/// A null move.

/// </summary>

NullMove

}

#endregion

#region Public Properties

/// <summary>

/// Gets or sets Alpha.

/// </summary>

public int Alpha { get; set; }

/// <summary>

/// Gets or sets Beta.

/// </summary>

public int Beta { get; set; }

/// <summary>

/// Gets text for the move useful in debugging.

/// </summary>

public string DebugText

{

get

{

return (this.Piece != null ? this.Piece.Player.Colour.ToString() + " "

+ this.Piece.Name.ToString() : string.Empty) + " "

+ this.From.Name

+ (this.PieceCaptured == null ? "-" : "x") + this.To.Name + " "

+ (this.PieceCaptured == null ? string.Empty : this.PieceCaptured.Name.ToString()) + " " // + this.Name

+ " A: " + this.Alpha

+ " B: " + this.Beta

+ " Score: " + this.Score

+ " " + this.DebugComment; // + " h: " + this.m_HashEntries.ToString() + " c:" + this.m_HashCaptures.ToString();

}

/// <summary>

/// Gets or sets a comment string containing useful debug info.

/// </summary>

public string DebugComment { get; set; }

/// <summary>

/// Gets a texual description of the move.

/// </summary>

public string Description

{

get

{

StringBuilder strbMove = new StringBuilder();

switch (this.Name)

{

case MoveNames.CastleKingSide:

strbMove.Append("O-O");

break;

case MoveNames.CastleQueenSide:

strbMove.Append("O-O-O");

break;

default:

if ((this.Piece.Name != Piece.PieceNames.Pawn) && !this.Piece.HasBeenPromoted)

{

strbMove.Append(this.Piece.Abbreviation);

}

strbMove.Append(this.From.Name);

if (this.PieceCaptured != null)

{

strbMove.Append("x");

if (this.PieceCaptured.Name != Piece.PieceNames.Pawn)

{

strbMove.Append(this.PieceCaptured.Abbreviation);

}

else

{

strbMove.Append("-");

}

strbMove.Append(this.To.Name);

break;

}

if (this.Piece.HasBeenPromoted)

{

strbMove.Append(":");

strbMove.Append(this.Piece.Abbreviation);

}

switch (this.EnemyStatus)

{

case Player.PlayerStatusNames.InCheckMate:

strbMove.Append((this.Piece.Player.Colour == Player.PlayerColourNames.White) ? "# 1-0" : "# 0-1");

break;

case Player.PlayerStatusNames.InStalemate:

strbMove.Append(" 1/2-1/2");

break;

case Player.PlayerStatusNames.InCheck:

strbMove.Append("+");

break;

}

if (this.IsThreeMoveRepetition || this.IsFiftyMoveDraw)

{

strbMove.Append(" 1/2-1/2");

}

return strbMove.ToString();

}

/// <summary>

/// Gets or sets status of the enemy e.g. In check, stalemate, checkmate etc.

/// </summary>

public Player.PlayerStatusNames EnemyStatus { get; set; }

/// <summary>

/// Gets a counter indicating closeness to a fifty-move-draw condition.

/// </summary>

public int FiftyMoveDrawCounter { get; private set; }

/// <summary>

/// Gets the move From square.

/// </summary>

public Square From { get; private set; }

/// <summary>

/// Gets or sets the board position HashCodeA.

/// </summary>

public ulong HashCodeA { get; set; }

/// <summary>

/// Gets or sets the board position HashCodeB.

/// </summary>

public ulong HashCodeB { get; set; }

/// <summary>

/// Gets or sets a value indicating whether the enemy is in check.

/// </summary>

public bool IsEnemyInCheck { get; set; }

/// <summary>

/// Gets a value indicating whether a fifty-move-draw condition has been reached.

/// </summary>

public bool IsFiftyMoveDraw

{

get

{

return this.FiftyMoveDrawCounter >= 100;

}

/// <summary>

/// Gets or sets a value indicating whether the player-to-play is in check.

/// </summary>

public bool IsInCheck { get; set; }

/// <summary>

/// Gets or sets a value indicating whether three-move-repetition applied to this move.

/// </summary>

public bool IsThreeMoveRepetition { get; set; }

/// <summary>

/// Gets last move turn-number.

/// </summary>

public int LastMoveTurnNo { get; private set; }

/// <summary>

/// Gets the move number.

/// </summary>

public int MoveNo

{

get

{

return (this.TurnNo / 2) + 1;

}

/// <summary>

/// Gets or sets Moves.

/// </summary>

public Moves Moves { get; set; }

/// <summary>

/// Gets the move name.

/// </summary>

public MoveNames Name { get; private set; }

/// <summary>

/// Gets the Piece being moved.

/// </summary>

public Piece Piece { get; private set; }

/// <summary>

/// Gets or sets the score relating to this move. Ususally used for assigning a move-ordering weighting.

/// </summary>

public int Score { get; set; }

/// <summary>

/// Gets or sets TimeStamp.

/// </summary>

public TimeSpan TimeStamp { get; set; }

/// <summary>

/// Gets the move To square.

/// </summary>

public Square To { get; private set; }

/// <summary>

/// Gets the turn number.

/// </summary>

public int TurnNo { get; private set; }

/// <summary>

/// Gets the piece being captured.

/// </summary>

public Piece PieceCaptured { get; private set; }

/// <summary>

/// Gets the ordinal of the piece being captured.

/// </summary>

public int PieceCapturedOrdinal { get; private set; }

#endregion

#region Public Methods

/// <summary>

/// Gets move name from text.

/// </summary>

/// <param name="moveName">

/// The move name text.

/// </param>

/// <returns>

/// The Move Name.

/// </returns>

public static MoveNames MoveNameFromString(string moveName)

{

if (moveName == MoveNames.Standard.ToString())

{

return MoveNames.Standard;

}

if (moveName == MoveNames.CastleKingSide.ToString())

{

return MoveNames.CastleKingSide;

}

if (moveName == MoveNames.CastleQueenSide.ToString())

{

return MoveNames.CastleQueenSide;

}

if (moveName == MoveNames.EnPassent.ToString())

{

return MoveNames.EnPassent;

}

if (moveName == "PawnPromotion")

{

return MoveNames.PawnPromotionQueen;

}

if (moveName == MoveNames.PawnPromotionQueen.ToString())

{

return MoveNames.PawnPromotionQueen;

}

if (moveName == MoveNames.PawnPromotionRook.ToString())

{

return MoveNames.PawnPromotionRook;

}

if (moveName == MoveNames.PawnPromotionBishop.ToString())

{

return MoveNames.PawnPromotionBishop;

}

if (moveName == MoveNames.PawnPromotionKnight.ToString())

{

return MoveNames.PawnPromotionKnight;

}

return 0;

}

/// <summary>

/// Determine where two moves are identical moves.

/// </summary>

/// <param name="moveA">

/// Move A.

/// </param>

/// <param name="moveB">

/// Move B.

/// </param>

/// <returns>

/// True if moves match.

/// </returns>

public static bool MovesMatch(Move moveA, Move moveB)

{

return moveA != null

&& moveB != null

&& moveA.Piece == moveB.Piece

&& moveA.From == moveB.From

&& moveA.To == moveB.To

&& moveA.Name == moveB.Name

&& (

(moveA.PieceCaptured == null && moveB.PieceCaptured == null)

|| (moveA.PieceCaptured != null && moveB.PieceCaptured != null && moveA.PieceCaptured == moveB.PieceCaptured));

}

/// <summary>

/// Undo the specified move.

/// </summary>

/// <param name="move">

/// Move to undo.

/// </param>

public static void Undo(Move move)

{

Board.HashCodeA ^= move.To.Piece.HashCodeA; // un_XOR the piece from where it was previously moved to

Board.HashCodeB ^= move.To.Piece.HashCodeB; // un_XOR the piece from where it was previously moved to

if (move.Piece.Name == Piece.PieceNames.Pawn)

{

Board.PawnHashCodeA ^= move.To.Piece.HashCodeA;

Board.PawnHashCodeB ^= move.To.Piece.HashCodeB;

}

move.Piece.Square = move.From; // Set piece board location

move.From.Piece = move.Piece; // Set piece on board

move.Piece.LastMoveTurnNo = move.LastMoveTurnNo;

move.Piece.NoOfMoves--;

if (move.Name != MoveNames.EnPassent)

{

move.To.Piece = move.PieceCaptured; // Return piece taken

}

else

{

move.To.Piece = null; // Blank square where this pawn was

Board.GetSquare(move.To.Ordinal - move.Piece.Player.PawnForwardOffset).Piece = move.PieceCaptured; // Return En Passent pawn taken

}

if (move.PieceCaptured != null)

{

move.PieceCaptured.Uncapture(move.PieceCapturedOrdinal);

Board.HashCodeA ^= move.PieceCaptured.HashCodeA; // XOR back into play the piece that was taken

Board.HashCodeB ^= move.PieceCaptured.HashCodeB; // XOR back into play the piece that was taken

if (move.PieceCaptured.Name == Piece.PieceNames.Pawn)

{

Board.PawnHashCodeA ^= move.PieceCaptured.HashCodeA;

Board.PawnHashCodeB ^= move.PieceCaptured.HashCodeB;

}

Piece pieceRook;

switch (move.Name)

{

case MoveNames.CastleKingSide:

pieceRook = move.Piece.Player.Colour == Player.PlayerColourNames.White ? Board.GetPiece(5, 0) : Board.GetPiece(5, 7);

Board.HashCodeA ^= pieceRook.HashCodeA;

Board.HashCodeB ^= pieceRook.HashCodeB;

pieceRook.Square = Board.GetSquare(7, move.Piece.Square.Rank);

pieceRook.LastMoveTurnNo = move.LastMoveTurnNo;

pieceRook.NoOfMoves--;

Board.GetSquare(7, move.Piece.Square.Rank).Piece = pieceRook;

Board.GetSquare(5, move.Piece.Square.Rank).Piece = null;

move.Piece.Player.HasCastled = false;

Board.HashCodeA ^= pieceRook.HashCodeA;

Board.HashCodeB ^= pieceRook.HashCodeB;

break;

case MoveNames.CastleQueenSide:

pieceRook = move.Piece.Player.Colour == Player.PlayerColourNames.White ? Board.GetPiece(3, 0) : Board.GetPiece(3, 7);

Board.HashCodeA ^= pieceRook.HashCodeA;

Board.HashCodeB ^= pieceRook.HashCodeB;

pieceRook.Square = Board.GetSquare(0, move.Piece.Square.Rank);

pieceRook.LastMoveTurnNo = move.LastMoveTurnNo;

pieceRook.NoOfMoves--;

Board.GetSquare(0, move.Piece.Square.Rank).Piece = pieceRook;

Board.GetSquare(3, move.Piece.Square.Rank).Piece = null;

move.Piece.Player.HasCastled = false;

Board.HashCodeA ^= pieceRook.HashCodeA;

Board.HashCodeB ^= pieceRook.HashCodeB;

break;

case MoveNames.PawnPromotionQueen:

case MoveNames.PawnPromotionRook:

case MoveNames.PawnPromotionBishop:

case MoveNames.PawnPromotionKnight:

move.Piece.Demote();

break;

}

Board.HashCodeA ^= move.From.Piece.HashCodeA; // XOR the piece back into the square it moved back to

Board.HashCodeB ^= move.From.Piece.HashCodeB; // XOR the piece back into the square it moved back to

if (move.From.Piece.Name == Piece.PieceNames.Pawn)

{

Board.PawnHashCodeA ^= move.From.Piece.HashCodeA;

Board.PawnHashCodeB ^= move.From.Piece.HashCodeB;

}

if (move.IsThreeMoveRepetition)

{

Board.HashCodeA ^= 31;

Board.HashCodeB ^= 29;

}

Game.TurnNo--;

Game.MoveHistory.RemoveLast();

}

/// <summary>

/// Compare the score of this move, and the specified move.

/// </summary>

/// <param name="move">

/// Nove to compare.

/// </param>

/// <returns>

/// 1 if specified move score is less, -1 if more, otherwise 0

/// </returns>

public int CompareTo(object move)

{

if (this.Score < ((Move)move).Score)

{

return 1;

}

if (this.Score > ((Move)move).Score)

{

return -1;

}

return 0;

}

/// <summary>

/// Is the move a promotion of pawn

/// </summary>

/// <returns>

/// true if promotion otherwise false

/// </returns>

/// <remarks>

/// Keep the order of the enumeration <see cref="MoveNames"/>.PawnPromotionQueen before PawnPromotionBishop

/// </remarks>

public bool IsPromotion()

{

return (this.Name >= MoveNames.PawnPromotionQueen) && (this.Name <= MoveNames.PawnPromotionBishop);

}

#endregion

}

SharpChess/SharpChess.Model/Move.cs at master · TheAppDevelopers/SharpChess · GitHub

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