/// <summary>
/// Checks if the white knight move is valid
/// </summary>
/// <param name="board"></param>
/// <param name="move"></param>
/// <returns></returns>
public static bool BlackKnight(ChessBoard board, ChessMove move)
{
//if not killing or empty space throw error
if (!KillOrEmpty(move.To.X, move.To.Y, board, ChessColor.Black))
return false;
//if not in a style of knight movement throw error
if (Math.Abs(move.To.X - move.From.X) == 2)
{
if (Math.Abs(move.To.Y - move.From.Y) != 1)
return false;
}
else if (Math.Abs(move.To.X - move.From.X) == 1)
{
if (Math.Abs(move.To.Y - move.From.Y) != 2)
return false;
}
else
{
return false;
}
//all good
return true;
}
/// <summary>
/// Constructor that creates a decision tree off of a chess board.
/// </summary>
/// <param name="board">The chess board that the decision tree starts from.</param>
public DecisionTree(ChessBoard board)
{
UvsChess.Framework.Profiler.AddToMainProfile((int)ProfilerMethodKey.DecisionTree_ctor_ChessBoard);
Children = new List<DecisionTree>();
Board = board;
BestChildMove = null;
}
/// <summary>
/// Takes a board and color, and returns a simplified state where friend pieces are represented
/// by positive integers and always start on the same side of the board (0,0). Foe pieces are
/// represented as negative values
/// </summary>
/// <param name="board">The board to convert</param>
/// <param name="color">The color of the player (friend)</param>
/// <returns>A simplified representation of the current board</returns>
public static int[,] GetSimpleState(ChessBoard board, ChessColor color)
{
int[,] state = new int[Columns, Rows];
for (int col = 0; col < Columns; col++)
{
for (int row = 0; row < Rows; row++)
{
int stateRow = row;
int stateCol = col;
if (color == ChessColor.White)
{
stateRow = Rows - row - 1;
stateCol = Columns - col - 1;
}
ChessPiece piece = board[col, row];
int multiplier = 1;
if (color == ChessColor.White && piece < ChessPiece.Empty
|| color == ChessColor.Black && piece > ChessPiece.Empty)
multiplier = -1;
state[stateCol, stateRow] = multiplier * GamePieceToStatePiece[piece];
}
}
return state;
}
public void GenerateMoves(ChessBoard board, ChessColor color)
{
Moves = new List<ChessMove>();
for (int y = 0; y < ChessBoard.NumberOfRows; y++)
{
for (int x = 0; x < ChessBoard.NumberOfColumns; x++)
{
if (color == ChessColor.White) // if player is white
{
if (board[x, y] > ChessPiece.Empty)
{
switch (board[x, y])
{
case ChessPiece.WhiteBishop:
BishopMoves(board, x, y, color);
break;
case ChessPiece.WhiteQueen:
QueenMoves(board, x, y, color);
break;
case ChessPiece.WhiteKing:
break;
case ChessPiece.WhiteKnight:
KnightMoves(board, x, y, color);
break;
case ChessPiece.WhitePawn:
PawnMoves(board, x, y, color);
break;
case ChessPiece.WhiteRook:
RookMoves(board, x, y, color);
break;
}
}
}
else if ( color == ChessColor.Black)
{
switch (board[x, y])
{
case ChessPiece.BlackBishop:
BishopMoves(board, x, y, color);
break;
case ChessPiece.BlackQueen:
QueenMoves(board, x, y, color);
break;
case ChessPiece.BlackKing:
break;
case ChessPiece.BlackKnight:
KnightMoves(board, x, y, color);
break;
case ChessPiece.BlackPawn:
PawnMoves(board, x, y, color);
break;
case ChessPiece.BlackRook:
RookMoves(board, x, y, color);
break;
}
}
}
}
}
private DecisionTree(DecisionTree parent, ChessBoard board, ChessMove move)
{
UvsChess.Framework.Profiler.AddToMainProfile((int)ProfilerMethodKey.DecisionTree_ctor_DecisionTree_ChessBoard_ChessMove);
Children = new List<DecisionTree>();
Parent = parent;
Board = board;
Move = move;
BestChildMove = null;
}
/// <summary>
/// this will define BoardAfterMove, TheMove, and HValue based on move
/// </summary>
/// <param name="board"></param>
/// <param name="move"></param>
/// <param name="colorofEnemy"></param>
public Hueristic(ChessBoard board, ChessMove move, ChessColor colorofEnemy)
{
BoardBeforeMove = board.Clone();
BoardAfterMove = board.Clone();
BoardAfterMove.MakeMove(move);
TheMove = move;
//HValue = CalculateHueristicBasic(board, colorofEnemy);
HValue = CalculateHueristicAdvanced(colorofEnemy);
}
/// <summary>
/// Checks if the move the black king wants to make is valid
/// </summary>
/// <param name="board">board state before move</param>
/// <param name="move">move the piece wants to make</param>
/// <returns>true if valid move, false is invalid</returns>
public static bool BlackKing(ChessBoard board, ChessMove move)
{
// ensure new move is onto an enemy piece or empty space
if (!KillOrEmpty(move.To.X, move.To.Y, board, ChessColor.Black))
return false;
//validate the move is only one space away for a king
if (Math.Abs(move.To.X - move.From.X) > 1 || Math.Abs(move.To.Y - move.From.Y) > 1)
return false;
//if all checks pass then
return true;
}
/// <summary>
/// Checks if the move the white king wants to make is valid
/// </summary>
/// <param name="board">board state before move</param>
/// <param name="move">move the piece wants to make</param>
/// <returns>true if valid move, false is invalid</returns>
public static bool WhiteKing(ChessBoard board, ChessMove move)
{
//TODO NOT DONE, still need to finish this
//validate the move is still on the board as well as
// ensure new move is onto an enemy piece or empty space
if (!OnBoardAndKillOrEmpty(move.To.X, move.To.Y,board,ChessColor.White))
return false;
//validate it doesn't put self into check
//if all checks pass then
return true;
}
/// <summary>
/// Checks if black bishop move is valid
/// </summary>
/// <param name="board"></param>
/// <param name="move"></param>
/// <returns></returns>
public static bool BlackBishop(ChessBoard board, ChessMove move)
{
//if he tries to move diagonal throw an error
if (Math.Abs(move.From.X - move.To.X) != Math.Abs(move.From.Y - move.To.Y))
{
return false;
}
//if the path is not clear or they are not moving to kill then no good
if (!PathClear(move.From.X, move.From.Y, move.To.X, move.To.Y, board) || !KillOrEmpty(move.To.X, move.To.Y, board, ChessColor.Black))
return false;
//all good
return true;
}
/// <summary>
/// High Number = better board for your color
/// </summary>
/// <param name="board"></param>
/// <param name="colorOfEnemyTeam"></param>
/// <returns></returns>
int CalculateBoardHP(ChessBoard board, ChessColor colorOfMyTeam)
{
int score = 0;
for (int x = 0; x < 8; x++)
{
for (int y = 0; y < 8; y++)
{
if (colorOfMyTeam == ChessColor.Black && BoardAfterMove[x, y] < ChessPiece.Empty) //if black
score += StudentAI.Piece.CalculatePieceValue(BoardAfterMove[x, y]);
else if (colorOfMyTeam == ChessColor.White && BoardAfterMove[x, y] > ChessPiece.Empty) //if white
score += StudentAI.Piece.CalculatePieceValue(BoardAfterMove[x, y]);
}
}
return score;
}
/// <summary>
/// gets a list of available moves for a color
/// </summary>
public static List<ChessMove> getmovesofcolor(StudentAI ai, ChessColor color, ChessBoard board)
{
List<ChessMove> colormoves = new List<ChessMove>();
for (int y = 0; y < 8; y++)
{
for (int x = 0; x < 8; x++)
{
if (color == ChessColor.Black)
{
switch (board[x, y])
{
case ChessPiece.BlackPawn:
case ChessPiece.BlackKnight:
case ChessPiece.BlackBishop:
case ChessPiece.BlackQueen:
case ChessPiece.BlackRook:
case ChessPiece.BlackKing:
colormoves.AddRange(getmovesofpiece(ai, color, board, new ChessLocation(x, y)));
break;
default:
break;
}
}
if (color == ChessColor.White)
{
switch (board[x, y])
{
case ChessPiece.WhitePawn:
case ChessPiece.WhiteKnight:
case ChessPiece.WhiteBishop:
case ChessPiece.WhiteQueen:
case ChessPiece.WhiteRook:
case ChessPiece.WhiteKing:
colormoves.AddRange(getmovesofpiece(ai, color, board, new ChessLocation(x, y)));
break;
default:
break;
}
}
}
}
return colormoves;
}
//checks if the move is still located on the board & is moved onto empty or kill spot
private static bool OnBoardAndKillOrEmpty(int X, int Y,ChessBoard board,ChessColor color)
{
if (X > 8 || X < 0 || Y > 8 || Y < 0)
return false;
if(board[X,Y] == ChessPiece.Empty)
{
if(color==ChessColor.White)
{
switch (board[X,Y])
{
case ChessPiece.BlackPawn:
case ChessPiece.BlackKnight:
case ChessPiece.BlackBishop:
case ChessPiece.BlackQueen:
case ChessPiece.BlackRook:
case ChessPiece.BlackKing:
return true;
default:
return false;
}
}
else if(color==ChessColor.Black)
{
switch (board[X, Y])
{
case ChessPiece.WhiteBishop:
case ChessPiece.WhiteKing:
case ChessPiece.WhiteKnight:
case ChessPiece.WhitePawn:
case ChessPiece.WhiteQueen:
case ChessPiece.WhiteRook:
return true;
default:
return false;
}
}
}
return true;
}
private void KnightMoves(ChessBoard board, int x, int y, ChessColor color)
{
ChessColor killColor = ChessColor.White;
if (color == ChessColor.White)
{
killColor = ChessColor.Black;
}
int x1 = x - 1;
int y1 = y - 2;
//up left direction
if ((x1 >= 0 && y1 >= 0 ))
{
if ((board[x1, y1] > ChessPiece.Empty && killColor == ChessColor.White) || (board[x1, y1] < ChessPiece.Empty && killColor == ChessColor.Black) || board[x1, y1] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x1, y1)));
}
}
// up right direction
x1 = x + 1;
if ((x1 < ChessBoard.NumberOfColumns && y1 >= 0 ) )
{
if ((board[x1, y1] > ChessPiece.Empty && killColor == ChessColor.White) || (board[x1, y1] < ChessPiece.Empty && killColor == ChessColor.Black) || board[x1, y1] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x1, y1)));
}
}
// right up direction
y1 = y - 1;
x1 = x + 2;
if (x1 < ChessBoard.NumberOfColumns && y1 >= 0)
{
if ((board[x1, y1] > ChessPiece.Empty && killColor == ChessColor.White) || (board[x1, y1] < ChessPiece.Empty && killColor == ChessColor.Black) || board[x1, y1] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x1, y1)));
}
}
// right down direction
y1 = y + 1;
if (x1 < ChessBoard.NumberOfRows && y1 < ChessBoard.NumberOfColumns)
{
if ((board[x1, y1] > ChessPiece.Empty && killColor == ChessColor.White) || (board[x1, y1] < ChessPiece.Empty && killColor == ChessColor.Black) || board[x1, y1] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x1, y1)));
}
}
// down left direction
x1 = x - 1;
y1 = y + 2;
if (x1 >= 0 && y1 < ChessBoard.NumberOfRows)
{
if ((board[x1, y1] > ChessPiece.Empty && killColor == ChessColor.White) || (board[x1, y1] < ChessPiece.Empty && killColor == ChessColor.Black) || board[x1, y1] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x1, y1)));
}
}
//down right direction
x1 = x + 1;
if (x1 < ChessBoard.NumberOfRows && y1 < ChessBoard.NumberOfColumns )
{
if ((board[x1, y1] > ChessPiece.Empty && killColor == ChessColor.White) || (board[x1, y1] < ChessPiece.Empty && killColor == ChessColor.Black) || board[x1, y1] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x1, y1)));
}
}
// left up direction
x1 = x - 2;
y1 = y - 1;
if (x1 >= 0 && y1 >= 0 )
{
if ((board[x1, y1] > ChessPiece.Empty && killColor == ChessColor.White) || (board[x1, y1] < ChessPiece.Empty && killColor == ChessColor.Black) || board[x1, y1] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x1, y1)));
}
}
// left down direction
y1 = y + 1;
if (x1 >= 0 && y1 < ChessBoard.NumberOfColumns )
{
if ((board[x1, y1] > ChessPiece.Empty && killColor == ChessColor.White) || (board[x1, y1] < ChessPiece.Empty && killColor == ChessColor.Black) || board[x1, y1] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x1, y1)));
}
}
}
/// <summary>
/// Checks if white rook move is valid
/// </summary>
/// <param name="board"></param>
/// <param name="move"></param>
/// <returns></returns>
public static bool WhiteRook(ChessBoard board, ChessMove move)
{
//if he tries to move diagonal throw an error
if(move.To.X!=move.From.X && move.To.Y!=move.From.Y)
{
return false;
}
//if the path is not clear or they are not moving to kill then no good
if (!PathClear(move.From.X, move.From.Y, move.To.X, move.To.Y, board) || !KillOrEmpty(move.To.X, move.To.Y, board, ChessColor.White))
return false;
//all good
return true;
}
private static bool checkEmpty(int X, int Y, ChessBoard board)
{
if (board[X, Y] == ChessPiece.Empty)
return true;
return false;
}
private static bool indanger(int x, int y, ChessBoard board, ChessColor color)
{
if (color == ChessColor.White)
{
if (board[x - 1, y - 1] == ChessPiece.BlackPawn || board[x + 1, y - 1] == ChessPiece.BlackPawn)
return true;
}
if (color == ChessColor.Black)
{
}
}
/// <summary>
/// Uses mini-max algorithm to determine the next move that should be taken
/// </summary>
/// <param name="board">The board to evaluate</param>
/// <param name="playerColor">The color of the player to determine moves for</param>
/// <param name="boardEvaluator">The heuristic to use in evaluating the board</param>
/// <returns>The best move based on the evaluation</returns>
public ChessMove MiniMaxMove(ChessBoard board, ChessColor playerColor, Func<int[,], ChessMove, int> boardEvaluator)
{
this.boardEvaluator = boardEvaluator;
ChessMove selectedMove = null;
List<ChessMove> bestMoves = null;
int depth = initialDepth;
int[,] state = SimpleState.GetSimpleState(board, playerColor);
List<ChessMove> allPossibleMoves = moveGenerator.GetAllMoves(state, true, boardEvaluator);
while (!timesUp() && allPossibleMoves.Count > 0)
{
if (bestMoves != null)
selectedMove = bestMoves[selectedMoveIndex % bestMoves.Count];
// Reverse Sort the moves so our best moves are at the beginning of the list to improve Alpha Beta Pruning
allPossibleMoves.Sort((x, y) => y.ValueOfMove.CompareTo(x.ValueOfMove));
bestMoves = new List<ChessMove>();
bestMoves.Add(allPossibleMoves[0]);
int i = 0;
int alpha = int.MinValue;
int beta = int.MaxValue;
for (i = 0; i < allPossibleMoves.Count && !timesUp(); i++)
{
ChessMove move = allPossibleMoves[i];
move.ValueOfMove = MinValue(moveGenerator.GetStateAfterMove(state, move), move, depth - 1, alpha, beta);
// Keep an ordered list of best moves -- this produces better results than simply sorting the final list since
// It keeps the relative order the same as the original heuristic pass
int pos = 0;
while (pos < bestMoves.Count && bestMoves[pos].ValueOfMove >= move.ValueOfMove)
pos++;
bestMoves.Insert(pos, move);
alpha = Math.Max(alpha, move.ValueOfMove);
}
#if DEBUG
log(string.Format("(Depth: {5}) Processed {0} move(s) out of {1}. Move: {2} (index: {3}, value: {4})", i, allPossibleMoves.Count, SimpleState.GetGameMove(bestMoves[0], playerColor).ToString(), selectedMoveIndex, bestMoves[0].ValueOfMove, depth));
#endif
depth++;
}
// In order to avoid moving back and forth endlessly, if we duplicate a recent move, then select the next best move instead of the best
if (previousMoves.Contains(selectedMove))
selectedMoveIndex++;
else
selectedMoveIndex = 0;
previousMoves.Enqueue(selectedMove.Clone());
while (previousMoves.Count > 10)
previousMoves.Dequeue();
// We shouldn't hit this, but if we haven't made it through one full search path then default to whatever the current best move is from the current incomplete search attempt
if (selectedMove == null && bestMoves != null && bestMoves.Count > 0)
selectedMove = bestMoves[0];
// If we didn't find any moves, then return stalemate
ChessMove gameMove = SimpleState.GetGameMove(selectedMove, playerColor) ?? new ChessMove(null, null) { Flag = ChessFlag.Stalemate };
log(string.Format("Chosen Move: {0} - Value: {1}", gameMove, gameMove.ValueOfMove));
log("Max Depth: " + (depth - 1));
return gameMove;
}
/// <summary>
/// Adds a child decision to the decision tree.
/// </summary>
/// <param name="board">The board the decision was made from</param>
/// <param name="move">The move decided.</param>
public void AddChild(ChessBoard board, ChessMove move)
{
UvsChess.Framework.Profiler.AddToMainProfile((int)ProfilerMethodKey.DecisionTree_AddChild_ChessBoard_ChessMove);
this.Children.Add(new DecisionTree(this, board, move));
}
//check if move is enemy
private static bool IsEnemy(int x, int y, ChessBoard board, ChessColor color)
{
if (color == ChessColor.White)
{
switch (board[x, y])
{
case ChessPiece.BlackPawn:
case ChessPiece.BlackKnight:
case ChessPiece.BlackBishop:
case ChessPiece.BlackQueen:
case ChessPiece.BlackRook:
case ChessPiece.BlackKing:
return true;
default:
return false;
}
}
if (color == ChessColor.Black)
{
switch (board[x, y])
{
case ChessPiece.WhiteBishop:
case ChessPiece.WhiteKing:
case ChessPiece.WhiteKnight:
case ChessPiece.WhitePawn:
case ChessPiece.WhiteQueen:
case ChessPiece.WhiteRook:
return true;
default:
return false;
}
}
throw new Exception("No Color defined");
}
public Hueristic getMinimax(StudentAI AI, ChessBoard board, ChessColor color, int depth, ChessColor maxColor, int alpha = -999999, int beta = 999999)
{
//TODO update to return heuristic instead of move and update get next move to return move of heuristic.
if (depth > maxdepth)
{
return new Hueristic(board,new ChessMove(null, null),color);
}
List<ChessMove> allmoves = new List<ChessMove>();
allmoves.AddRange(PieceMoves.getmovesofcolor(AI, color, board));
List<Hueristic> HueristicMoves = new List<Hueristic>();
//DecisionTree descisions = new DecisionTree(board);
//descisions.
ChessColor oppositeColor = color == ChessColor.Black ? ChessColor.White : ChessColor.Black;
//set check/checkmate flag and calculate hueristic on each move
foreach (var move in allmoves)
{
var tempBoard = board.Clone();
tempBoard.MakeMove(move);
if (StudentAI.IsKingInCheck(tempBoard, oppositeColor))
{
move.Flag = ChessFlag.Check;
//check for checkmate
if (PieceMoves.getmovesofcolor(AI, oppositeColor, tempBoard).Count == 0)
{
move.Flag = ChessFlag.Checkmate;
return new Hueristic(board,move,color);
}
}
HueristicMoves.Add(new Hueristic(board, move, color));
if (color == maxColor && move.Flag == ChessFlag.Check)
HueristicMoves[HueristicMoves.Count - 1].HValue += 2;
if (color == maxColor && move.Flag == ChessFlag.Checkmate)
{
HueristicMoves[HueristicMoves.Count - 1].HValue = 10000;
return HueristicMoves[HueristicMoves.Count -1];
}
}
HueristicMoves.Sort((x, y) => y.HValue.CompareTo(x.HValue));
if (AI.IsMyTurnOver() && HueristicMoves.Count > 0)
return HueristicMoves[0];
//if (depth == maxdepth && HueristicMoves.Count>0)
// return HueristicMoves[0];
List<Hueristic> updatedhueristic = new List<Hueristic>();
//minimax and alpha beta pruning
bool defined = false;
var temp = new List<Hueristic>();
do
{
//TODO, store previous move and if we ran out of time use that one since we don't know if optimal on the next one
temp = new List<Hueristic>();
foreach (var hmove in HueristicMoves)
{
var tempBoard = board.Clone();
if (hmove.TheMove != null)
{
tempBoard.MakeMove(hmove.TheMove);
if (depth != maxdepth)
{
var oppositemove = getMinimax(AI, tempBoard, oppositeColor, depth + 1, maxColor, alpha, beta);
//get best move of the other color
if (oppositemove.TheMove.To != null && oppositemove.TheMove.From != null)
{
hmove.HValue -= oppositemove.HValue;
// update our moves score based on return of projected other move
}
}
temp.Add(hmove); // add new scored hueristic to new list
if (AI.IsMyTurnOver())
break;
//a=max(a,hueristic)
if (maxColor == color)
{
alpha = alpha > hmove.HValue ? alpha : hmove.HValue;
if (beta <= alpha)
break;
}
else
{
beta = beta < hmove.HValue ? beta : hmove.HValue;
if (beta <= alpha)
break;
}
}
}
if (!AI.IsMyTurnOver())
{
if (depth == 0)
{
maxdepth += 1;
defined = true;
updatedhueristic = temp;
}
}
} while (!AI.IsMyTurnOver() && depth == 0);
if (!defined)
updatedhueristic = temp;
updatedhueristic.Sort((x, y) => y.HValue.CompareTo(x.HValue)); // sort the new list
if (color == maxColor)
{
if (updatedhueristic.Count == 0)
{
var game_over = new ChessMove(null, null);
game_over.Flag = ChessFlag.Stalemate;
var game_overhueristic = new Hueristic(board, game_over, color);
return game_overhueristic;
}
int tiecount = -1;
foreach (var x in updatedhueristic)
if (x.HValue == updatedhueristic[0].HValue)
tiecount++;
if (tiecount > 0)
return updatedhueristic[rand.Next(0, tiecount)];
}
if (updatedhueristic.Count == 0)
return new Hueristic(board,new ChessMove(null, null),color);
return updatedhueristic[0]; //return the best value from the new list
}
/// <summary>
/// Returns true if its just our king, their king, and we have a single rook or queen
/// </summary>
/// <param name="board">The board to evaluate</param>
/// <param name="myColor">The player's color</param>
/// <returns>True if we're in an end-game state otherwise false</returns>
public bool IsEndgame(ChessBoard board, ChessColor myColor)
{
int numberOfPieces = 0;
for (int column = 0; column < ChessBoard.NumberOfColumns; column++)
{
for (int row = 0; row < ChessBoard.NumberOfRows; row++)
{
ChessPiece piece = board[column, row];
if (piece != ChessPiece.Empty && piece != ChessPiece.WhiteQueen && piece != ChessPiece.WhiteRook &&
piece != ChessPiece.BlackQueen && piece != ChessPiece.BlackRook &&
piece != ChessPiece.WhiteKing && piece != ChessPiece.BlackKing)
return false;
if (piece != ChessPiece.Empty)
numberOfPieces++;
}
}
if (numberOfPieces == 3)
return true;
else
return false;
}
private void RookMoves(ChessBoard board, int x, int y, ChessColor color)
{
ChessColor killColor = ChessColor.White;
if (color == ChessColor.White)
{
killColor = ChessColor.Black;
}
for (int i = y + 1; i < ChessBoard.NumberOfRows; i++) // direction down
{
if (board[x, i] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, i)));
}
else
{
if ((board[x, i] > ChessPiece.Empty && killColor == ChessColor.White) || (board[x, i] < ChessPiece.Empty && killColor == ChessColor.Black))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, i)));
}
break;
}
}
for (int i = y - 1; i >= 0; i--) // direction up
{
if (board[x, i] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, i)));
}
else
{
if ((board[x, i] > ChessPiece.Empty && killColor == ChessColor.White) || (board[x, i] < ChessPiece.Empty && killColor == ChessColor.Black))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, i)));
}
break;
}
}
for (int j = x - 1; j > 0; j--) // direction left
{
if (board[j, y] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(j, y)));
}
else
{
if ((board[j, y] > ChessPiece.Empty && killColor == ChessColor.White) || (board[j, y] < ChessPiece.Empty && killColor == ChessColor.Black))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(j, y)));
}
break;
}
}
for (int j = x + 1; j < ChessBoard.NumberOfColumns; j++) // direction right
{
if (board[j, y] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(j,y)));
}
else
{
if ((board[j, y] > ChessPiece.Empty && killColor == ChessColor.White) || (board[j, y] < ChessPiece.Empty && killColor == ChessColor.Black))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(j, y)));
}
break;
}
}
}
private void BishopMoves(ChessBoard board, int x, int y, ChessColor color)
{
ChessColor killColor = ChessColor.White;
if (color == ChessColor.White)
{
killColor = ChessColor.Black;
}
int i = x - 1;
int j = y - 1;
while (i > 0 && j > 0) // up left direction
{
if (board[i, j] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(i, j)));
}
else
{
if ((board[i, j] > ChessPiece.Empty && killColor == ChessColor.White) || (board[i, j] < ChessPiece.Empty && killColor == ChessColor.Black) )
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, j)));
}
break;
}
i--;
j--;
}
while (i > 0 && j < ChessBoard.NumberOfColumns) // up right direction
{
if (board[i, j] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(i, j)));
}
else
{
if ((board[i, j] > ChessPiece.Empty && killColor == ChessColor.White) || (board[i, j] < ChessPiece.Empty && killColor == ChessColor.Black))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, j)));
}
break;
}
i++;
j--;
}
while (i < ChessBoard.NumberOfRows && j > 0) // down left direction
{
if (board[i, j] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(i, j)));
}
else
{
if ((board[i, j] > ChessPiece.Empty && killColor == ChessColor.White) || (board[i, j] < ChessPiece.Empty && killColor == ChessColor.Black))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, j)));
}
break;
}
i--;
j++;
}
while (i < ChessBoard.NumberOfRows && j < ChessBoard.NumberOfColumns) // down right direction
{
if (board[i, j] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(i, j)));
}
else
{
if ((board[i, j] > ChessPiece.Empty && killColor == ChessColor.White) || (board[i, j] < ChessPiece.Empty && killColor == ChessColor.Black))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, j)));
}
break;
}
i++;
j++;
}
}
private void QueenMoves(ChessBoard board, int x, int y, ChessColor color)
{
RookMoves(board, x, y, color);
BishopMoves(board, x, y, color);
}
//checks if the move is still located on the board & is moved onto empty or kill spot
private static bool KillOrEmpty(int x, int y,ChessBoard board,ChessColor color)
{
if(board[x,y] != ChessPiece.Empty)
{
if(color==ChessColor.White)
{
switch (board[x,y])
{
case ChessPiece.BlackPawn:
case ChessPiece.BlackKnight:
case ChessPiece.BlackBishop:
case ChessPiece.BlackQueen:
case ChessPiece.BlackRook:
case ChessPiece.BlackKing:
return true;
default:
return false;
}
}
if(color==ChessColor.Black)
{
switch (board[x, y])
{
case ChessPiece.WhiteBishop:
case ChessPiece.WhiteKing:
case ChessPiece.WhiteKnight:
case ChessPiece.WhitePawn:
case ChessPiece.WhiteQueen:
case ChessPiece.WhiteRook:
return true;
default:
return false;
}
}
}
return true;
}
//easy enough to just use inline check for this instead of calling a function
/*private static bool CheckEmpty(int x, int y, ChessBoard board)
{
if (board[x, y] == ChessPiece.Empty)
return true;
return false;
}*/
//this will not check last position for enemy or blank
private static bool PathClear(int fromX, int fromY, int toX, int toY, ChessBoard board)
{
//if horizontal
if(fromY==toY)
{
if (toX - fromX > 0)
fromX++;
else
fromX--;
while (fromX != toX)
{
if (board[fromX, fromY] != ChessPiece.Empty)
return false;
if (toX - fromX > 0)
fromX++;
else
fromX--;
}
}
//if vertical
else if(fromX==toX)
{
if (toY - fromY > 0)
fromY++;
else
fromY--;
while (fromY != toY)
{
if (board[fromX, fromY] != ChessPiece.Empty)
return false;
if (toY - fromY > 0)
fromY++;
else
fromY--;
}
}
//if diagonal
else if(Math.Abs(fromX-toX)==Math.Abs(fromY-toY))
{
if (toY - fromY > 0)
fromY++;
else
fromY--;
if (toX - fromX > 0)
fromX++;
else
fromX--;
while (fromY != toY)
{
if (board[fromX, fromY] != ChessPiece.Empty)
return false;
if (toY - fromY > 0)
fromY++;
else
fromY--;
if (toX - fromX > 0)
fromX++;
else
fromX--;
}
}
else //if none of the above
{
return false;
}
return true;
}
/// <summary>
/// Checks if the move the white pawn wants to make is valid
/// </summary>
/// <param name="board">board state before move</param>
/// <param name="move">move the piece wants to make</param>
/// <returns>true if valid move, false is invalid</returns>
public static bool BlackPawn(ChessBoard board, ChessMove move)
{
//if pawn tries to move backwords
if (move.To.Y <= move.From.Y) //white pawns Y goes up or less than
return false;
//validate move is still on board & is empty or kill
if (move.From.Y == 1 && move.To.Y == 3) //trying to move two places from start
{
//make sure they're moving to the same column
if (move.To.X != move.From.X)
return false;
//if both spaces are not empty
if (board[move.To.X, move.To.Y] != ChessPiece.Empty || board[move.To.X, move.To.Y - 1] != ChessPiece.Empty)
return false;
}
//if just moving forward by one
else if (move.To.Y - move.From.Y == 1)
{
//if going for kill diagnoally
if (Math.Abs(move.From.X - move.To.X) == 1)
{
if (!IsEnemy(move.To.X, move.To.Y, board, ChessColor.Black))
return false;
}
//if just moving forward
else if (move.From.X == move.To.X)
{
if (board[move.To.X, move.To.Y] != ChessPiece.Empty)
return false;
}
//otherwise false if moving too far horizontally
else
{
return false;
}
}
else
{
return false;
}
//all checks pass
return true;
}
private void KingMoves(ChessBoard board, int x, int y, ChessColor color)
{
if (color == ChessColor.White)
{
//king moves up
if (x > 0 && (board[x - 1, y] == ChessPiece.Empty || board[x - 1, y] < ChessPiece.Empty))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x - 1, y)));
}
// king moves up and left
if (y > 0 && x > 0 && (board[x - 1, y - 1] == ChessPiece.Empty || board[x - 1, y - 1] < ChessPiece.Empty))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x - 1, y - 1)));
}
// king moves up and right
if (y < ChessBoard.NumberOfColumns && x > 0 && (board[x - 1, y + 1] == ChessPiece.Empty || board[x - 1, y + 1] < ChessPiece.Empty))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x - 1, y + 1)));
}
//king right moves
if (y < ChessBoard.NumberOfColumns && (board[x, y + 1] == ChessPiece.Empty || board[x, y + 1] == ChessPiece.Empty))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, y + 1)));
}
//king moves left
if (y > 0 && (board[x, y - 1] < ChessPiece.Empty || board[x, y - 1] < ChessPiece.Empty))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, y - 1)));
}
//king moves down and left
if (y > 0 && x < ChessBoard.NumberOfRows && board[x + 1, y - 1] < ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x + 1, y - 1)));
}
//king moves down
if (x < ChessBoard.NumberOfRows && (board[x + 1, y] == ChessPiece.Empty || board[x + 1, y] < ChessPiece.Empty))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x + 1, y)));
}
//king moves down and right
if (y < ChessBoard.NumberOfColumns && x < ChessBoard.NumberOfRows && (board[x + 1, y + 1] == ChessPiece.Empty || board[x + 1, y + 1] < ChessPiece.Empty))
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x + 1, y + 1)));
}
}
else
{
if (board[x + 1, y] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x + 1, y)));
}
if (y > 0 && board[x + 1, y - 1] > ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x + 1, y - 1)));
}
if (y < ChessBoard.NumberOfColumns && board[x + 1, y + 1] < ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x + 1, y + 1)));
}
if (x == 2 && board[x + 1, y] == ChessPiece.Empty && board[x + 2, y] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x - 2, y)));
}
}
}
/// <summary>
/// gets move for a specfic piece
/// </summary>
public static List<ChessMove> getmovesofpiece(StudentAI ai,ChessColor color, ChessBoard board,ChessLocation location)
{
List<ChessMove> piecemoves = new List<ChessMove>();
ChessMove move = new ChessMove(location,location);
switch (board[location])
{
case ChessPiece.BlackPawn:
ChessMove bdiag1 = new ChessMove(location,new ChessLocation((location.X)-1,(location.Y)+1));
ChessMove bdown = new ChessMove(location,new ChessLocation((location.X),(location.Y)+1));
ChessMove bdown2 = new ChessMove(location, new ChessLocation((location.X), (location.Y) + 2));
ChessMove bdiag2 = new ChessMove(location,new ChessLocation((location.X)+1,(location.Y)+1));
if (ai.IsValidMove(board, bdiag1, color))
piecemoves.Add(bdiag1);
if (ai.IsValidMove(board, bdown, color))
piecemoves.Add(bdown);
if (ai.IsValidMove(board, bdiag2, color))
piecemoves.Add(bdiag2);
if (ai.IsValidMove(board, bdown2, color))
piecemoves.Add(bdown2);
break;
case ChessPiece.WhitePawn:
ChessMove wdiag1 = new ChessMove(location,new ChessLocation((location.X)-1,(location.Y)-1));
ChessMove wup = new ChessMove(location,new ChessLocation((location.X),(location.Y)-1));
ChessMove wup2 = new ChessMove(location, new ChessLocation((location.X), (location.Y) - 2));
ChessMove wdiag2 = new ChessMove(location,new ChessLocation((location.X)+1,(location.Y)-1));
if (ai.IsValidMove(board, wdiag1, color))
piecemoves.Add(wdiag1);
if (ai.IsValidMove(board, wup, color))
piecemoves.Add(wup);
if (ai.IsValidMove(board, wdiag2, color))
piecemoves.Add(wdiag2);
if (ai.IsValidMove(board, wup2, color))
piecemoves.Add(wup2);
break;
case ChessPiece.BlackKing:
for (int i = -1; i < 2; i++)
{
for (int j = -1; j < 2; j++)
{
move = new ChessMove(location, new ChessLocation(location.X + i, location.Y + j));
if(ai.IsValidMove(board,move,color))
piecemoves.Add(move);
}
}
break;
case ChessPiece.WhiteKing:
for (int i = -1; i < 2; i++)
{
for (int j = -1; j < 2; j++)
{
move = new ChessMove(location, new ChessLocation(location.X + i, location.Y + j));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
}
}
break;
case ChessPiece.BlackKnight:
move = new ChessMove(location, new ChessLocation(location.X + 2, location.Y + 1));
if(ai.IsValidMove(board,move,color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + 2, location.Y + -1));
if(ai.IsValidMove(board,move,color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + 1, location.Y + 2));
if(ai.IsValidMove(board,move,color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + 1, location.Y + -2));
if(ai.IsValidMove(board,move,color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + -2, location.Y + 1));
if(ai.IsValidMove(board,move,color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + -2, location.Y + -1));
if(ai.IsValidMove(board,move,color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + -1, location.Y + 2));
if(ai.IsValidMove(board,move,color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + -1, location.Y + -2));
if(ai.IsValidMove(board,move,color))
piecemoves.Add(move);
break;
case ChessPiece.WhiteKnight:
move = new ChessMove(location, new ChessLocation(location.X + 2, location.Y + 1));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + 2, location.Y + -1));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + 1, location.Y + 2));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + 1, location.Y + -2));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + -2, location.Y + 1));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + -2, location.Y + -1));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + -1, location.Y + 2));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
move = new ChessMove(location, new ChessLocation(location.X + -1, location.Y + -2));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
break;
case ChessPiece.BlackBishop:
case ChessPiece.WhiteBishop:
bool flag = true;
int x = 1;
while(flag)
{
move = new ChessMove(location, new ChessLocation(location.X + x, location.Y + x));
if(ai.IsValidMove(board,move,color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while (flag)
{
move = new ChessMove(location, new ChessLocation(location.X + x, location.Y - x));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while (flag)
{
move = new ChessMove(location, new ChessLocation(location.X - x, location.Y - x));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while (flag)
{
move = new ChessMove(location, new ChessLocation(location.X - x, location.Y + x));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
break;
case ChessPiece.BlackRook:
case ChessPiece.WhiteRook:
flag = true;
x = 1;
while(flag)
{
move = new ChessMove(location, new ChessLocation(location.X + x, location.Y));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while(flag)
{
move = new ChessMove(location, new ChessLocation(location.X - x, location.Y));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while(flag)
{
move = new ChessMove(location, new ChessLocation(location.X, location.Y+x));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while(flag)
{
move = new ChessMove(location, new ChessLocation(location.X, location.Y-x));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
break;
case ChessPiece.BlackQueen:
case ChessPiece.WhiteQueen:
flag = true;
x = 1;
while (flag)
{
move = new ChessMove(location, new ChessLocation(location.X + x, location.Y + x));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while (flag)
{
move = new ChessMove(location, new ChessLocation(location.X + x, location.Y - x));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while (flag)
{
move = new ChessMove(location, new ChessLocation(location.X - x, location.Y - x));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while (flag)
{
move = new ChessMove(location, new ChessLocation(location.X - x, location.Y + x));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while (flag)
{
move = new ChessMove(location, new ChessLocation(location.X + x, location.Y));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while (flag)
{
move = new ChessMove(location, new ChessLocation(location.X - x, location.Y));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while (flag)
{
move = new ChessMove(location, new ChessLocation(location.X, location.Y + x));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
x = 1;
flag = true;
while (flag)
{
move = new ChessMove(location, new ChessLocation(location.X, location.Y - x));
if (ai.IsValidMove(board, move, color))
piecemoves.Add(move);
else
flag = false;
x++;
}
break;
default:
return piecemoves;
}
return piecemoves;
}
private void PawnMoves(ChessBoard board, int x, int y, ChessColor color)
{
if (color == ChessColor.White)
{
if (y - 1 > 0 && board[x , y - 1] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x , y - 1)));
}
if (y - 1 > 0 && x - 1 > 0 && board[x - 1, y - 1] < ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x - 1, y - 1)));
}
if (y - 1 < ChessBoard.NumberOfColumns && x + 1 < ChessBoard.NumberOfRows && board[x + 1, y - 1] < ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x + 1, y - 1)));
}
if (y == 6 && board[x, y - 1] == ChessPiece.Empty && board[x , y - 2] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, y - 2)));
}
}
else
{
if (y + 1 < ChessBoard.NumberOfRows && board[x , y + 1] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, y + 1)));
}
if (y + 1 < ChessBoard.NumberOfRows && x + 1 < ChessBoard.NumberOfColumns && board[x + 1, y + 1] > ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x + 1, y + 1)));
}
if (y < ChessBoard.NumberOfColumns && x + 1 < ChessBoard.NumberOfRows && board[x + 1, y + 1] < ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x + 1, y + 1)));
}
if (y == 2 && board[x , y + 1] == ChessPiece.Empty && board[x , y + 2] == ChessPiece.Empty)
{
Moves.Add(new ChessMove(new ChessLocation(x, y), new ChessLocation(x, y + 2)));
}
}
}
