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Chessboard.cs
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Chessboard.cs
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using System;
namespace zChess
{
public enum Colors { Black, White, nil }
public enum Pieces { King, Queen, Rook, Bishop, Knight, Pawn };
public enum Files { a, b, c, d, e, f, g, h };
public abstract class chessman
{
public readonly static string[] strFiles = new string[8] { "a", "b", "c", "d", "e", "f", "g", "h" };
protected static int Number = 0;
protected Chessboard board;
protected chessman[] teammates;
protected chessman[] rivals;
protected int pieceID = 0;
protected sbyte pieceIndex;
protected Colors Coalition;
protected Colors RivalColor;
protected Pieces Piece;
protected bool Alive = false;
protected sbyte[] position = new sbyte [2];
protected bool initialPos = true;
protected int firstStep = int.MaxValue;
protected sbyte R0; // = 0 for White ; = 7 for Black
protected byte capacity;
public virtual string Symbol { get; set; }
public sbyte[,] MovesArray { get; set; }
public byte MaxMoves
{
get { return capacity; }
}
public string Chessboard
{
get { return board.name; }
}
public int ID
{
get { return pieceID; }
}
public sbyte index
{
get { return pieceIndex; }
}
public Colors color
{
get { return Coalition; }
}
public Pieces piece
{
get { return Piece; }
}
public bool isAlive
{
get { return Alive; }
}
public sbyte iniRank
{
get { return R0; }
}
public sbyte[] posArr
{
get { return position; }
}
public string posStr
{
get
{
string file = strFiles[position[0]];
string rank = (position[1] + 1).ToString();
return (file + rank);
}
}
public bool InInitial
{
get { return initialPos; }
}
public int FirstStep
{
get { return firstStep; }
}
public void capture()
{
Alive = false;
}
public void revive()
{
Alive = true;
}
public virtual byte tryCastling(byte xside) // method will be overridden in the derived class King
{
return 0;
}
public abstract sbyte[,] DefineMoves(out byte Num, int currStep = -1, bool refined = false);
/*
* returns movesArr = new int[k,2] ; k is number of possible moves
* movesArr[k,0] is number of file
* movesArr[k,1] is number of rank
* movesArr[k,0] = -128 means that k-move is not defined or prohibited
*/
public sbyte Move(int currStep, sbyte ifile, sbyte jrank, ref sbyte[,] movesArr, bool free = false)
{
sbyte success = -128;
if (free)
{
position[0] = ifile;
position[1] = jrank;
success = -1;
if ( (ifile < 0) || (jrank < 0) || (ifile > 7) || (jrank > 7) ) Alive = false;
}
else
{
sbyte keyValue;
byte num;
if (movesArr == null)
{
if (MovesArray == null)
{
MovesArray = DefineMoves(out num, currStep); // true number of valid moves (out num) is not used here
}
num = (byte)MovesArray.GetLength(0);
movesArr = MovesArray;
}
else
{
num = (byte)movesArr.GetLength(0);
}
for (byte i = 0; i < num; i++)
{
keyValue = movesArr[i,0];
if ( keyValue >= 0 && keyValue == ifile && movesArr[i,1] == jrank )
{
position[0] = ifile;
position[1] = jrank;
success = (sbyte)i;
break;
}
}
} // end if (free)
if (success != -128)
{
if (initialPos)
{
firstStep = currStep;
initialPos = false;
}
else if (currStep == firstStep)
{
firstStep = int.MaxValue;
initialPos = true;
}
}
return success;
} // end of public bool Move(...)
public void AIMove(int currStep, sbyte ifile, sbyte jrank)
{
position[0] = ifile;
position[1] = jrank;
if (initialPos)
{
firstStep = currStep;
initialPos = false;
}
else if (currStep == firstStep)
{
firstStep = int.MaxValue;
initialPos = true;
}
return;
} // end of public bool AIMove(...)
public void SetState(bool alive, sbyte[] cell, bool initialPos, int firstStep) // method is needed to rewind journal
{
this.Alive = alive;
this.position = cell;
this.initialPos = initialPos;
this.firstStep = firstStep;
}
/*public chessman(Colors color = Colors.Black, Pieces piece = Pieces.Pawn, sbyte[] cell = null)
{
pieceID = ++Number;
Alive = true;
Coalition = color;
Piece = piece;
position = cell ?? new sbyte[2];
} // */
} // end of public abstract class chessman //////////////////////////////////////////////////////////////////////////////
public class King : chessman
{
private chessman KingsideRook = null;
private chessman QueensideRook = null;
private bool KingsideFeasible = true;
private bool QueensideFeasible = true;
public override string Symbol
{
get
{
return "K ";
}
}
public static readonly sbyte[][] IniPosition = new sbyte[2][]
{
new sbyte[2] { 4, 7 }, // Black
new sbyte[2] { 4, 0 } // White
};
public readonly int[,] shiftsArr;
public readonly int[,] shiftsHemicycle;
public readonly sbyte[,] KnightInvaders;
public bool SetCastleRooks(byte xside = 0)
{
bool check01 = (xside == 0 || xside == 1);
bool check02 = (xside == 0 || xside == 2);
if (check01) // kingside Rook
{
KingsideFeasible = true;
KingsideRook = teammates[3];
if (KingsideRook == null || KingsideRook.piece != Pieces.Rook) // then try to find it in cell R0,7
{
KingsideRook = board.Require(R0, 7);
if (KingsideRook == null || KingsideRook.color == RivalColor || KingsideRook.piece != Pieces.Rook ||
!KingsideRook.isAlive || !KingsideRook.InInitial)
{
KingsideFeasible = false;
KingsideRook = null;
}
}
else if (!KingsideRook.isAlive || !KingsideRook.InInitial) KingsideFeasible = false;
}
if (check02) // queenside Rook
{
QueensideFeasible = true;
QueensideRook = teammates[2];
if (QueensideRook == null || QueensideRook.piece != Pieces.Rook) // then try to find it in cell R0,0
{
QueensideRook = board.Require(R0, 0);
if (QueensideRook == null || QueensideRook.color == RivalColor || QueensideRook.piece != Pieces.Rook ||
!QueensideRook.isAlive || !QueensideRook.InInitial)
{
QueensideFeasible = false;
QueensideRook = null;
}
}
else if (!QueensideRook.isAlive || !QueensideRook.InInitial) QueensideFeasible = false;
}
return ( (KingsideFeasible && check01) || (QueensideFeasible && check02) );
}
public override sbyte[,] DefineMoves(out byte ind, int currStep = -1, bool refined = false)
{
sbyte[,] movesArr = new sbyte[8, 2];
int ifile = position[0];
int jrank = position[1];
int i1;
int j1;
bool Flag0 = true;
bool Flag4 = true;
chessman Holder;
ind = 0;
for (int i = 0; i < 8; i++) // Define movesArr in such a way that as a result of the move the King would not be in check
{
i1 = ifile + shiftsArr[i, 0];
if ( i1 >= 0 && i1 <= 7)
{
j1 = jrank + shiftsArr[i, 1];
if ( j1 >= 0 && j1 <= 7)
{
Holder = board.Require( i1, j1 );
if (Holder == null || !Holder.isAlive || Holder.color != Coalition)
{
Alive = false; // for correct result of the (board.Require(_i1, _j1, Coalition) == null)
if (board.Require(i1, j1, Coalition) == null) // verify that the cell is not under attack of any rival
{
movesArr[ind, 0] = (sbyte)i1;
movesArr[ind, 1] = (sbyte)j1;
ind++;
if (i == 0 && Holder != null && Holder.isAlive) Flag0 = false;
else if (i == 4 && Holder != null && Holder.isAlive) Flag4 = false;
}
else if (i == 0) Flag0 = false; // cell is under attack
else if (i == 4) Flag4 = false; // cell is under attack
Alive = true;
}
else if (i == 0) Flag0 = false; // cell owner is teammate
else if (i == 4) Flag4 = false; // cell owner is teammate
}
}
} // end for
if (initialPos && (Flag0 || Flag4) &&
board.Require(4, R0, Coalition, shiftsHemicycle, KnightInvaders) == null) // define permissions for the Castling
{
if (Flag4 && KingsideFeasible && (KingsideRook != null || SetCastleRooks(1)) &&
KingsideRook.isAlive && KingsideRook.InInitial &&
board.Require(6, R0) == null && board.Require(5, R0) == null &&
board.Require(5, R0, Coalition, shiftsHemicycle, KnightInvaders) == null &&
board.Require(6, R0, Coalition, shiftsHemicycle, KnightInvaders) == null) // teammates[3] h-Rook - kingside castling
{
movesArr[ind, 0] = 6;
movesArr[ind, 1] = R0;
ind++;
}
if (Flag0 && QueensideFeasible && (QueensideRook != null || SetCastleRooks(2)) &&
QueensideRook.isAlive && QueensideRook.InInitial &&
board.Require(1, R0) == null && board.Require(2, R0) == null && board.Require(3, R0) == null &&
board.Require(3, R0, Coalition, shiftsHemicycle, KnightInvaders) == null &&
board.Require(2, R0, Coalition, shiftsHemicycle, KnightInvaders) == null) // teammates[2] a-Rook - queenside castling
{
movesArr[ind, 0] = 2;
movesArr[ind, 1] = R0;
ind++;
}
}
for (int i = ind; i < 8; i++) movesArr[i, 0] = -128; // fills the remaining elements with the values that are out of range
return movesArr;
} // end of public override sbyte[,] DefineMoves
public override byte tryCastling(byte xside = 0)
{
byte Num = 0;
if (initialPos && board.Require(4, R0, Coalition, shiftsHemicycle, KnightInvaders) == null)
{
if ((xside == 0 || xside == 1) &&
KingsideFeasible && (KingsideRook != null || SetCastleRooks(1)) &&
KingsideRook.isAlive && KingsideRook.InInitial &&
board.Require(6, R0) == null && board.Require(5, R0) == null &&
board.Require(5, R0, Coalition, shiftsHemicycle, KnightInvaders) == null &&
board.Require(6, R0, Coalition, shiftsHemicycle, KnightInvaders) == null) // teammates[3] h-Rook - kingside castling
{
Num = 1;
}
if ((xside == 0 || xside == 2) &&
QueensideFeasible && (QueensideRook != null || SetCastleRooks(2)) &&
QueensideRook.isAlive && QueensideRook.InInitial &&
board.Require(1, R0) == null && board.Require(2, R0) == null && board.Require(3, R0) == null &&
board.Require(3, R0, Coalition, shiftsHemicycle, KnightInvaders) == null &&
board.Require(2, R0, Coalition, shiftsHemicycle, KnightInvaders) == null) // teammates[2] a-Rook - queenside castling
{
Num += 2;
}
}
return Num; // 0: both are prohibited ; 1: kingside 0-0 ; 2: queenside 0-0-0 ; 3: both are allowed
}
public King(Chessboard Board, sbyte Ind, Colors color = Colors.Black, sbyte[] cell = null)
{
this.board = Board;
pieceID = ++Number;
pieceIndex = Ind;
Alive = true;
Coalition = color;
Piece = Pieces.King;
capacity = 8;
if (color == Colors.Black)
{
position = new sbyte[2] { 4, 7 };
R0 = 7;
teammates = Board.BlackPieces;
rivals = Board.WhitePieces;
RivalColor = Colors.White;
shiftsArr = new int[8, 2] { {-1, 0}, {-1, -1}, {0, -1}, {1, -1}, {1, 0}, {1, 1}, {0, 1}, {-1, 1} };
shiftsHemicycle = new int[8, 2] { {85,85}, {-1, -1}, {0, -1}, {1, -1}, {85,85}, {85,85}, {85,85}, {85,85} }; // {85,85} to disable i-th direction
KnightInvaders = new sbyte[4, 2] { { -2, -1 }, { -1, -2 }, { 1, -2 }, { 2, -1 } };
}
else // color is Colors.White
{
position = new sbyte[2] { 4, 0 };
R0 = 0;
teammates = Board.WhitePieces;
rivals = Board.BlackPieces;
RivalColor = Colors.Black;
shiftsArr = new int[8, 2] { {-1, 0}, {-1, 1}, {0, 1}, {1, 1}, {1, 0}, {1, -1}, {0, -1}, {-1, -1} };
shiftsHemicycle = new int[8, 2] { {85,85}, {-1, 1}, {0, 1}, {1, 1}, {85,85}, {85,85}, {85,85}, {85,85} };
KnightInvaders = new sbyte[4, 2] { { -2, 1 }, { -1, 2 }, { 1, 2 }, { 2, 1 } };
}
if (cell == null)
{
initialPos = true;
firstStep = int.MaxValue;
}
else // King has made a move before game start
{
position = cell;
initialPos = false;
firstStep = int.MinValue;
}
}
} // end of public class King //////////////////////////////////////////////////////////////////////////////////////////////
public class Queen : chessman
{
public override string Symbol
{
get
{
return "Q ";
}
}
public readonly int[,] shiftsArr;
public override sbyte[,] DefineMoves(out byte Num, int currStep = -1, bool refined = false)
{
Num = 0;
sbyte[,] movesArr = new sbyte[27, 2];
int i1 = position[0];
int j1 = position[1];
int ifile = i1;
int jrank = j1;
int[,] RingCells = new int[8, 2] { { i1, j1}, { i1, j1 }, { i1, j1 }, { i1, j1 }, { i1, j1 }, { i1, j1 }, { i1, j1 }, { i1, j1 } };
bool active = false;
bool[] Bearings = new bool[8] { true, true, true, true, true, true, true, true };
chessman Owner;
for (int iter = 0; iter < 7; iter++) // Range expansion loop ----------------
{
for (int i = 0; i < 8; i++) // Bearing loop -----------------
{
if (Bearings[i])
{
RingCells[i, 0] += shiftsArr[i, 0];
ifile = RingCells[i, 0];
if (ifile >= 0 && ifile <=7)
{
RingCells[i, 1] += shiftsArr[i, 1];
jrank = RingCells[i, 1];
if (jrank >= 0 && jrank <= 7)
{
Owner = board.Require( ifile, jrank );
if (Owner == null || !Owner.isAlive)
{
active = true;
if ( !refined || board.VerifyMove(this, i1, j1, ifile, jrank) )
{
movesArr[Num, 0] = (sbyte)ifile;
movesArr[Num, 1] = (sbyte)jrank;
Num++;
}
}
else if (Owner.color == RivalColor)
{
if ( !refined || board.VerifyMove(this, i1, j1, ifile, jrank) )
{
movesArr[Num, 0] = (sbyte)ifile;
movesArr[Num, 1] = (sbyte)jrank;
Num++;
}
}
} // end if (jrank >= 0 && jrank <= 7)
} // end if (ifile >= 0 && ifile <=7)
} // end if (Bearings[i])
Bearings[i] = active;
active = false;
} // end of Bearing loop ------------------------------------
} // end of Range expansion loop -------------------------------------------
for (int ind = Num; ind < 27; ind++)
{
movesArr[ind, 0] = -128; // fills the remaining elements
}
return movesArr;
}
public Queen(Chessboard Board, sbyte Ind, Colors color = Colors.Black, sbyte[] cell = null)
{
this.board = Board;
pieceID = ++Number;
pieceIndex = Ind;
Alive = true;
Coalition = color;
Piece = Pieces.Queen;
capacity = 27;
if (color == Colors.Black)
{
position = new sbyte[2] { 3, 7 };
teammates = Board.BlackPieces;
rivals = Board.WhitePieces;
RivalColor = Colors.White;
shiftsArr = new int[8, 2] { { -1, 0 }, { -1, -1 }, { 0, -1 }, { 1, -1 }, { 1, 0 }, { 1, 1 }, { 0, 1 }, { -1, 1 } };
}
else // color is Colors.White
{
position = new sbyte[2] { 3, 0 };
teammates = Board.WhitePieces;
rivals = Board.BlackPieces;
RivalColor = Colors.Black;
shiftsArr = new int[8, 2] { { -1, 0 }, { -1, 1 }, { 0, 1 }, { 1, 1 }, { 1, 0 }, { 1, -1 }, { 0, -1 }, { -1, -1 } };
}
if (cell == null)
{
initialPos = true;
firstStep = int.MaxValue;
}
else // Queen has made a move before game start
{
position = cell;
initialPos = false;
firstStep = int.MinValue;
}
}
} // end of public class Queen ////////////////////////////////////////////////////////////////////////////////////////////
public class Rook : chessman
{
public override string Symbol
{
get
{
return "R ";
}
}
public static readonly sbyte[][,] IniPosition = new sbyte[2][,]
{
new sbyte[2, 2] { { 0, 7 }, { 7, 7 } }, // Black
new sbyte[2, 2] { { 0, 0 }, { 7, 0 } } // White
};
public readonly int[,] shiftsArr;
public override sbyte[,] DefineMoves(out byte Num, int currStep = -1, bool refined = false)
{
Num = 0;
sbyte[,] movesArr = new sbyte[14, 2];
int i1 = position[0];
int j1 = position[1];
int ifile = i1;
int jrank = j1;
int[,] RingCells = new int[4, 2] { { ifile, jrank }, { ifile, jrank }, { ifile, jrank }, { ifile, jrank } };
bool active = false;
bool[] Bearings = new bool[4] { true, true, true, true };
chessman Owner;
for (int iter = 0; iter < 7; iter++) // Range expansion loop ----------------
{
for (int i = 0; i < 4; i++) // Bearing loop -----------------
{
if (Bearings[i])
{
RingCells[i, 0] += shiftsArr[i, 0];
ifile = RingCells[i, 0];
if (ifile >= 0 && ifile <= 7)
{
RingCells[i, 1] += shiftsArr[i, 1];
jrank = RingCells[i, 1];
if (jrank >= 0 && jrank <= 7)
{
Owner = board.Require( ifile, jrank );
if (Owner == null || !Owner.isAlive)
{
active = true;
if ( !refined || board.VerifyMove(this, i1, j1, ifile, jrank) )
{
movesArr[Num, 0] = (sbyte)ifile;
movesArr[Num, 1] = (sbyte)jrank;
Num++;
}
}
else if (Owner.color == RivalColor)
{
if ( !refined || board.VerifyMove(this, i1, j1, ifile, jrank) )
{
movesArr[Num, 0] = (sbyte)ifile;
movesArr[Num, 1] = (sbyte)jrank;
Num++;
}
}
} // end if (jrank >= 0 && jrank <= 7)
} // end if (ifile >= 0 && ifile <=7)
} // end if (Bearings[i])
Bearings[i] = active;
active = false;
} // end of Bearing loop ------------------------------------
} // end of Range expansion loop -------------------------------------------
for (int ind = Num; ind < 14; ind++)
{
movesArr[ind, 0] = -128; // fills the remaining elements
}
return movesArr;
}
public Rook(Chessboard Board, sbyte Ind, Colors color = Colors.Black, sbyte[] cell = null)
{
this.board = Board;
pieceID = ++Number;
pieceIndex = Ind;
Alive = true;
Coalition = color;
Piece = Pieces.Rook;
capacity = 14;
if (color == Colors.Black)
{
if (Ind == 2) position = new sbyte[2] { 0, 7 };
else position = new sbyte[2] { 7, 7 };
teammates = Board.BlackPieces;
rivals = Board.WhitePieces;
RivalColor = Colors.White;
shiftsArr = new int[4, 2] { { -1, 0 }, { 0, -1 }, { 1, 0 }, { 0, 1 } };
}
else // color is Colors.White
{
if (Ind == 2) position = new sbyte[2] { 0, 0 };
else position = new sbyte[2] { 7, 0 };
teammates = Board.WhitePieces;
rivals = Board.BlackPieces;
RivalColor = Colors.Black;
shiftsArr = new int[4, 2] { { -1, 0 }, { 0, 1 }, { 1, 0 }, { 0, -1 } };
}
if (cell == null)
{
initialPos = true;
firstStep = int.MaxValue;
}
else // Rook has made a move before game start
{
position = cell;
initialPos = false;
firstStep = int.MinValue;
}
}
} // end of public class Rook //////////////////////////////////////////////////////////////////////////////////////////////
public class Bishop : chessman
{
public override string Symbol
{
get
{
return "B ";
}
}
public readonly int[,] shiftsArr;
public override sbyte[,] DefineMoves(out byte Num, int currStep = -1, bool refined = false)
{
Num = 0;
sbyte[,] movesArr = new sbyte[13, 2];
int i1 = position[0];
int j1 = position[1];
int ifile = i1;
int jrank = j1;
int[,] RingCells = new int[4, 2] { { ifile, jrank }, { ifile, jrank }, { ifile, jrank }, { ifile, jrank } };
bool active = false;
bool[] Bearings = new bool[4] { true, true, true, true };
chessman Owner;
for (int iter = 0; iter < 7; iter++) // Range expansion loop ----------------
{
for (int i = 0; i < 4; i++) // Bearing loop -----------------
{
if (Bearings[i])
{
RingCells[i, 0] += shiftsArr[i, 0];
ifile = RingCells[i, 0];
if (ifile >= 0 && ifile <= 7)
{
RingCells[i, 1] += shiftsArr[i, 1];
jrank = RingCells[i, 1];
if (jrank >= 0 && jrank <= 7)
{
Owner = board.Require( ifile, jrank );
if (Owner == null || !Owner.isAlive)
{
active = true;
if ( !refined || board.VerifyMove(this, i1, j1, ifile, jrank) )
{
movesArr[Num, 0] = (sbyte)ifile;
movesArr[Num, 1] = (sbyte)jrank;
Num++;
}
}
else if (Owner.color == RivalColor)
{
if ( !refined || board.VerifyMove(this, i1, j1, ifile, jrank) )
{
movesArr[Num, 0] = (sbyte)ifile;
movesArr[Num, 1] = (sbyte)jrank;
Num++;
}
}
} // end if (jrank >= 0 && jrank <= 7)
} // end if (ifile >= 0 && ifile <=7)
} // end if (Bearings[i])
Bearings[i] = active;
active = false;
} // end of Bearing loop ------------------------------------
} // end of Range expansion loop -------------------------------------------
for (int ind = Num; ind < 13; ind++)
{
movesArr[ind, 0] = -128; // fills the remaining elements
}
return movesArr;
}
public Bishop(Chessboard Board, sbyte Ind, Colors color = Colors.Black, sbyte[] cell = null)
{
this.board = Board;
pieceID = ++Number;
pieceIndex = Ind;
Alive = true;
Coalition = color;
Piece = Pieces.Bishop;
capacity = 13;
if (color == Colors.Black)
{
if (Ind == 4) position = new sbyte[2] { 2, 7 };
else position = new sbyte[2] { 5, 7 };
teammates = Board.BlackPieces;
rivals = Board.WhitePieces;
RivalColor = Colors.White;
shiftsArr = new int[4, 2] { { -1, -1 }, { 1, -1 }, { 1, 1 }, { -1, 1 } };
}
else // color is Colors.White
{
if (Ind == 4) position = new sbyte[2] { 2, 0 };
else position = new sbyte[2] { 5, 0 };
teammates = Board.WhitePieces;
rivals = Board.BlackPieces;
RivalColor = Colors.Black;
shiftsArr = new int[4, 2] { { -1, 1 }, { 1, 1 }, { 1, -1 }, { -1, -1 } };
}
if (cell == null)
{
initialPos = true;
firstStep = int.MaxValue;
}
else // Rook has made a move before game start
{
position = cell;
initialPos = false;
firstStep = int.MinValue;
}
}
} // end of public class Bishop //////////////////////////////////////////////////////////////////////////////////////////////
public class Knight : chessman
{
public override string Symbol
{
get
{
return "N ";
}
}
public readonly sbyte[,] shiftsArr;
public override sbyte[,] DefineMoves(out byte Num, int currStep = -1, bool refined = false)
{
Num = 0;
sbyte[,] movesArr = new sbyte[8, 2];
sbyte ifile = position[0];
sbyte jrank = position[1];
sbyte ihop = 0;
sbyte jhop = 0;
chessman Owner;
for (int i = 0; i < 8; i++)
{
ihop = ifile;
ihop += shiftsArr[i, 0];
if (ihop >= 0 && ihop <= 7)
{
jhop = jrank;
jhop += shiftsArr[i, 1];
if (jhop >= 0 && jhop <= 7)
{
Owner = board.Require(ihop, jhop);
if (Owner == null || !Owner.isAlive || Owner.color == RivalColor)
{
if ( !refined || board.VerifyMove(this, ifile, jrank, ihop, jhop) )
{
movesArr[Num, 0] = ihop;
movesArr[Num, 1] = jhop;
Num++;
}
}
} // end if (jhop >= 0 && jhop <= 7)
} // end if (ihop >= 0 && ihop <= 7)
}
for (int ind = Num; ind < 8; ind++)
{
movesArr[ind, 0] = -128; // fills the remaining elements
}
return movesArr;
}
public Knight(Chessboard Board, sbyte Ind, Colors color = Colors.Black, sbyte[] cell = null)
{
this.board = Board;
pieceID = ++Number;
pieceIndex = Ind;
Alive = true;
Coalition = color;
Piece = Pieces.Knight;
capacity = 8;
if (color == Colors.Black)
{
if (Ind == 6) position = new sbyte[2] { 1, 7 };
else position = new sbyte[2] { 6, 7 };
teammates = Board.BlackPieces;
rivals = Board.WhitePieces;
RivalColor = Colors.White;
shiftsArr = new sbyte[8, 2] { { -2, -1 }, { -1, -2 }, { 1, -2 }, { 2, -1 }, { 2, 1 }, { 1, 2 }, { -1, 2 }, { -2, 1 } };
}
else // color is Colors.White
{
if (Ind == 6) position = new sbyte[2] { 1, 0 };
else position = new sbyte[2] { 6, 0 };
teammates = Board.WhitePieces;
rivals = Board.BlackPieces;
RivalColor = Colors.Black;
shiftsArr = new sbyte[8, 2] { { -2, 1 }, { -1, 2 }, { 1, 2 }, { 2, 1 }, { 2, -1 }, { 1, -2 }, { -1, -2 }, { -2, -1 } };
}
if (cell == null)
{
initialPos = true;
firstStep = int.MaxValue;
}
else // Rook has made a move before game start
{
position = cell;
initialPos = false;
firstStep = int.MinValue;
}
}
} // end of public class Knight //////////////////////////////////////////////////////////////////////////////////////////////
public class Pawn : chessman
{
public override string Symbol
{
get
{
return "p ";
}
}
public static readonly sbyte[] IniPosition = new sbyte[2] { 6, 1 }; // { BlackLine, WhiteLine }
public readonly sbyte[,] shiftsArr;
public readonly sbyte PassantRank;
public override sbyte[,] DefineMoves(out byte Num, int currStep = -1, bool refined = false)
{
Num = 0;
sbyte[,] movesArr = new sbyte[4, 2];
if (currStep < 0) currStep = board.Scoresheet.StepNumber;
sbyte ifile = position[0];
sbyte jrank = position[1];
sbyte i1;
sbyte j1 = jrank;
sbyte jshift = shiftsArr[0, 1];
chessman Owner = null;
for (byte i = 0; i < 2; i++) // free forward move
{
if ( i == 0 || (initialPos && (Owner == null || !Owner.isAlive)) )
{
j1 += jshift;
if (j1 >= 0 && j1 <= 7)
{
Owner = board.Require(ifile, j1);
if (Owner == null || !Owner.isAlive)
{
if ( !refined || board.VerifyMove(this, ifile, jrank, ifile, j1) )
{
movesArr[Num, 0] = ifile;
movesArr[Num, 1] = j1;
Num++;
}
}
}
}