/// <summary>
/// Executes AI move
/// </summary>
/// <param name="currentBoard">The current board</param>
public void Execute(Board currentBoard)
{
if (algorithm != null)
{
Board next = algorithm.NextMove(currentBoard);
if(IsEqual(currentBoard, next))
throw new Exception();
Game.Instance.SetBoard(next);
}
}
private bool IsEqual(Board boardA, Board boardB)
{
for (int x = 0; x < 21; x++)
{
for (int y = 0; y < 20; y++)
{
if (boardA.BoardSituation[x, y] != boardB.BoardSituation[x, y])
return false;
}
}
return true;
}
/// <summary>
/// Does a random move
/// </summary>
/// <param name="currentBoard">Board to calculate random move</param>
/// <returns>Random move</returns>
public Board NextMove(Board currentBoard)
{
// Generate moves
List<Board> nextMoves = currentBoard.GenerateMoves(Game.Instance.GetTurn());
// create random and get random number
System.Random random = new System.Random();
int move = random.Next(0, nextMoves.Count);
// return move
if (nextMoves.Count > 0)
return nextMoves[move];
else
throw new Exception();
return currentBoard;
}
/// <summary>
/// Does the next move
/// </summary>
/// <param name="currentBoard">Board to calculate best move</param>
/// <returns>Best boardsituation</returns>
public Board NextMove(Board currentBoard)
{
Board evaluationBoard = new Board();
bool evaluationBoardSet = false;
int valuelast = Int32.MinValue;
List<Board> sameHighest = new List<Board>();
List<Board> moves = currentBoard.GenerateMoves(Game.Instance.GetTurn());
foreach (Board board in moves)
{
int value = 0;
if(board.IsTileMoved)
value = MiniMaxFunction(board, plieDepth, Game.Instance.GetTurn(), Game.Instance.GetTurn());
else
value = MiniMaxFunction(board, plieDepth, Game.Instance.GetTurn(), !Game.Instance.GetTurn());
if (value > valuelast || !evaluationBoardSet)
{
sameHighest = new List<Board>();
sameHighest.Add(board);
evaluationBoard = board;
valuelast = value;
evaluationBoardSet = true;
}
else if (value == valuelast)
{
sameHighest.Add(board);
}
}
if (sameHighest.Count > 1 && sameHighest.Contains(evaluationBoard))
{
System.Random random = new System.Random();
evaluationBoard = sameHighest[random.Next(0, sameHighest.Count - 1)];
while (evaluationBoard.IsTileMoved)
evaluationBoard = sameHighest[random.Next(0, sameHighest.Count - 1)];
}
if (IsEqual(evaluationBoard, currentBoard))
throw new Exception();
//Logger.AddLine("MiniMax: boards with same value: " + sameHighest.Count + " of " + moves.Count + " moves");
Logger.AddLine("Board -> Evaluation value: " + evaluationBoard.Evaluation(Game.Instance.GetTurn(), Game.Instance.GetTurn()));
return evaluationBoard;
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public object Clone()
{
Board b = new Board((BoardPosition[,])this.BoardSituation.Clone());
b.WhiteItems = this.WhiteItems;
b.IsTileMoved = this.IsTileMoved;
b.RedItems = this.RedItems;
b.MovedTilePosition = this.movedTilePosition;
return b;
}
/// <summary>
///
/// </summary>
/// <param name="turnPlayerA"></param>
/// <returns></returns>
public List<Board> ChangeBoardPosition(bool turnPlayerA)
{
List<Board> boards = new List<Board>();
BoardPosition colorHead = BoardPosition.WhiteHead;
BoardPosition colorTail = BoardPosition.WhiteTail;
if (turnPlayerA)
{
colorHead = BoardPosition.RedHead;
colorTail = BoardPosition.RedTail;
}
for (int x = 0; x < 21; x++)
{
for (int y = 0; y < 20; y++)
{
if (boardPositions[x, y] == colorHead || boardPositions[x, y] == colorTail)
{
for (int j = -1; j < 2; j++)
{
for (int i = -1; i < 2; i++)
{
if (!(i == 0 && j == 0) && (x + i >= 0 && x + i < 21) && (y + j >= 0 && y + j < 20))
{
// Moving a piece to a empty tile next to him
if (boardPositions[x + i, y + j] == BoardPosition.Tile)
{
if ((this.isTileMoved && (this.movedTilePosition.X == x + i && this.movedTilePosition.Y == y + j)) || !this.isTileMoved)
{
BoardPosition[,] newBoardPosition = (BoardPosition[,])boardPositions.Clone();
newBoardPosition[x, y] = BoardPosition.Tile;
newBoardPosition[x + i, y + j] = boardPositions[x, y];
Board newBoard = new Board(newBoardPosition);
newBoard.RedItems = this.RedItems;
newBoard.WhiteItems = this.WhiteItems;
newBoard.IsTileMoved = false;
boards.Add(newBoard);
}
}
// Moving a piece by jumping over a other piece next to him
else if (boardPositions[x + i, y + j] != BoardPosition.Empty)
{
if (x + i + i >= 0 && x + i + i < 21 && y + j + j >= 0 && y + j + j < 20)
{
if (boardPositions[x + i + i, y + j + j] == BoardPosition.Tile || (this.isTileMoved && boardPositions[x + i + i, y + j + j] == BoardPosition.Empty))
{
if ((this.isTileMoved && (this.movedTilePosition.X == x + i + i && this.movedTilePosition.Y == y + j + j)) || !this.isTileMoved)
{
BoardPosition[,] newBoardPosition =
(BoardPosition[,])boardPositions.Clone();
newBoardPosition[x, y] = BoardPosition.Tile;
if (boardPositions[x, y] == colorTail)
newBoardPosition[x + i + i, y + j + j] = colorHead;
else
newBoardPosition[x + i + i, y + j + j] = colorTail;
Board newBoard = new Board(newBoardPosition);
newBoard.RedItems = this.RedItems;
newBoard.WhiteItems = this.WhiteItems;
newBoard.IsTileMoved = false;
boards.Add(newBoard);
}
}
else if (boardPositions[x + i + i, y + j + j] == BoardPosition.Empty && !isTileMoved)
{
Point moveTileTo = new Point(x + i + i, y + j + j);
foreach (Point movablePoint in movablePoints)
{
if(boardPositions[movablePoint.X, movablePoint.Y] == BoardPosition.Tile)
{
BoardPosition[,] newBoardPosition = (BoardPosition[,])boardPositions.Clone();
newBoardPosition[movablePoint.X, movablePoint.Y] = BoardPosition.Empty;
newBoardPosition[moveTileTo.X, moveTileTo.Y] = BoardPosition.Tile;
bool canBeMovedThere = false;
if (newBoardPosition[moveTileTo.X + 1, moveTileTo.Y] != BoardPosition.Empty)
canBeMovedThere = true;
if (newBoardPosition[moveTileTo.X - 1, moveTileTo.Y] != BoardPosition.Empty)
canBeMovedThere = true;
if (newBoardPosition[moveTileTo.X, moveTileTo.Y + 1] != BoardPosition.Empty)
canBeMovedThere = true;
if (newBoardPosition[moveTileTo.X, moveTileTo.Y - 1] != BoardPosition.Empty)
canBeMovedThere = true;
if (canBeMovedThere)
{
Board newBoard = new Board(newBoardPosition);
newBoard.RedItems = this.RedItems;
newBoard.WhiteItems = this.WhiteItems;
newBoard.IsTileMoved = true;
newBoard.MovedTilePosition = moveTileTo;
boards.Add(newBoard);
}
}
}
}
}
}
else if (!isTileMoved && (boardPositions[x + i, y + j] == BoardPosition.Empty || boardPositions[x + i + i, y + j + j] == BoardPosition.Empty))
{
bool isMovableTile = false;
if ((i == -1 && j == -1) ||
(i == 1 && j == 1) ||
(i == -1 && j == 1) ||
(i == 1 && j == -1))
{
int currentI = x + i;
int currentJ = y + j;
if (currentJ - 1 >= 0)
if (boardPositions[currentI, currentJ - 1] != BoardPosition.Empty) isMovableTile = true;
if (currentJ + 1 < 20)
if (boardPositions[currentI, currentJ + 1] != BoardPosition.Empty) isMovableTile = true;
if (currentI + 1 < 21)
if (boardPositions[currentI + 1, currentJ] != BoardPosition.Empty) isMovableTile = true;
if (currentI - 1 >= 0)
if (boardPositions[currentI - 1, currentJ] != BoardPosition.Empty) isMovableTile = true;
}
else
isMovableTile = true;
if (isMovableTile)
{
Point moveTileTo = new Point(x + i, y + j);
if (boardPositions[x + i, y + j] != BoardPosition.Empty)
{
moveTileTo.X += i;
moveTileTo.Y += j;
}
foreach (Point movablePoint in movablePoints)
{
if(boardPositions[movablePoint.X, movablePoint.Y] == BoardPosition.Tile)
{
BoardPosition[,] newBoardPosition = (BoardPosition[,])boardPositions.Clone();
newBoardPosition[movablePoint.X, movablePoint.Y] = BoardPosition.Empty;
newBoardPosition[moveTileTo.X, moveTileTo.Y] = BoardPosition.Tile;
bool canBeMovedThere = false;
if (newBoardPosition[moveTileTo.X + 1, moveTileTo.Y] != BoardPosition.Empty)
canBeMovedThere = true;
if (newBoardPosition[moveTileTo.X - 1, moveTileTo.Y] != BoardPosition.Empty)
canBeMovedThere = true;
if (newBoardPosition[moveTileTo.X, moveTileTo.Y + 1] != BoardPosition.Empty)
canBeMovedThere = true;
if (moveTileTo.Y - 1 >= 0) {
if (newBoardPosition[moveTileTo.X, moveTileTo.Y - 1] != BoardPosition.Empty)
canBeMovedThere = true;
}
if (canBeMovedThere)
{
Board newBoard = new Board(newBoardPosition);
newBoard.RedItems = this.RedItems;
newBoard.WhiteItems = this.WhiteItems;
newBoard.IsTileMoved = true;
newBoard.MovedTilePosition = moveTileTo;
boards.Add(newBoard);
}
}
}
}
}
}
}
}
}
}
}
if (boards.Count == 0)
throw new Exception();
return boards;
}
public bool IsCalculatedBefore(Board board, int depth, bool isPlayerAMax, bool turnPlayerA)
{
Int64 hashKey = CreateHashKey(board, depth, isPlayerAMax, turnPlayerA);
int position = (int)Math.Abs((hashKey % tableSize));
HashObject hashObject = tableContent[position];
if (hashObject == null)
return false;
if (hashObject.depth >= depth && hashObject.hashKey == hashKey && hashObject.isPlayerAMax == isPlayerAMax && hashObject.turnPlayerA == turnPlayerA)
return true;
return false;
}
public int GetCalculatedValue(Board board, int depth, bool isPlayerAMax, bool turnPlayerA)
{
Int64 hashKey = CreateHashKey(board, depth, isPlayerAMax, turnPlayerA);
int position = (int)Math.Abs((hashKey % tableSize));
HashObject hashObject = tableContent[position];
if (hashObject == null)
throw new Exception("Board has not been calculated before and inserted into the transposition table");
if (hashObject.depth >= depth && hashObject.hashKey == hashKey && hashObject.isPlayerAMax == isPlayerAMax && hashObject.turnPlayerA == turnPlayerA)
return hashObject.value;
else
throw new Exception("Board has not been calculated before and inserted into the transposition table");
}
/// <summary>
/// starts a new game
/// </summary>
/// <param name="playerA">playersettings of player A</param>
/// <param name="playerB">playersettings of player B</param>
/// <param name="startBoard">a board to start with</param>
/// <param name="startPlayer">player that turns first</param>
public void StartGame(PlayerSettings playerA, PlayerSettings playerB, Board startBoard, int startPlayer)
{
Game.Instance.StartGame(playerA, playerB, startBoard, startPlayer);
}
/// <summary>
/// place pace to a point and switches the turn
/// </summary>
/// <param name="point">point for piece</param>
public void PlacePiece(Point point)
{
Board b = (Board)board.Clone();
b.BoardSituation[point.X, point.Y] = (turnPlayerA ? BoardPosition.RedTail : BoardPosition.WhiteTail);
if (turnPlayerA)
b.RedItems++;
else
b.WhiteItems++;
bool isInList = false;
b.CalculateMovableTiles();
List<Board> possibleMoves = board.GenerateMoves(turnPlayerA);
foreach (Board pm in possibleMoves)
{
if(pm.CompareTo(b)==0)
isInList = true;
}
if (isInList)
{
board = b;
Logger.AddLine(GetCurrentPlayerNumber() + "-> Placed piece on: " + point.X + ", " + point.Y);
Logger.AddLine("Board -> Evaluationvalue: " + board.Evaluation(turnPlayerA, turnPlayerA));
ChangePlayer();
}
else
{
Logger.AddLine(GetCurrentPlayerNumber() + "-> Placing piece on: " + point.X + ", " + point.Y + " is not a valid move");
}
}
/// <summary>
/// move tile to a new point
/// </summary>
/// <param name="a">from point</param>
/// <param name="b">to point</param>
public void MoveTile(Point a, Point b)
{
Board cloneBoard = (Board)board.Clone();
cloneBoard.BoardSituation[b.X, b.Y] = BoardPosition.Tile;
cloneBoard.BoardSituation[a.X, a.Y] = BoardPosition.Empty;
cloneBoard.IsTileMoved = true;
cloneBoard.MovedTilePosition = new Point(b.X, b.Y);
cloneBoard.CalculateMovableTiles();
List<Board> possibleMoves = board.GenerateMoves(turnPlayerA);
bool isInList = false;
foreach (Board pm in possibleMoves)
{
if (pm.CompareTo(cloneBoard) == 0)
isInList = true;
}
if (isInList)
{
Logger.AddLine(GetCurrentPlayerNumber() + "-> Moved tile from: " + a.X + ", " + a.Y + " to " + b.X + ", " + b.Y);
board = cloneBoard;
}
else
{
Logger.AddLine(GetCurrentPlayerNumber() + "-> It's not possible to move tile from: " + a.X + ", " + a.Y + " to " + b.X + ", " + b.Y);
}
}
/// <summary>
/// move piece to a new point and switches the turn
/// </summary>
/// <param name="a">from point</param>
/// <param name="b">to point</param>
public void MovePiece(Point a, Point b)
{
Board cloneBoard = (Board)board.Clone();
BoardPosition old = cloneBoard.BoardSituation[a.X, a.Y];
cloneBoard.IsTileMoved = false;
if(Math.Abs(a.X - b.X)==2 || Math.Abs(a.Y - b.Y) == 2)
{
switch (old)
{
case BoardPosition.RedTail:
old = BoardPosition.RedHead;
break;
case BoardPosition.RedHead:
old = BoardPosition.RedTail;
break;
case BoardPosition.WhiteTail:
old = BoardPosition.WhiteHead;
break;
case BoardPosition.WhiteHead:
old = BoardPosition.WhiteTail;
break;
}
}
cloneBoard.BoardSituation[b.X, b.Y] = old;
cloneBoard.BoardSituation[a.X, a.Y] = BoardPosition.Tile;
cloneBoard.CalculateMovableTiles();
List<Board> possibleMoves = board.GenerateMoves(turnPlayerA);
bool isInList = false;
foreach (Board pm in possibleMoves)
{
if (pm.CompareTo(cloneBoard) == 0)
isInList = true;
}
if(isInList)
{
Logger.AddLine(GetCurrentPlayerNumber() + "-> Moved piece from: " + a.X + ", " + a.Y + " to " + b.X + ", " + b.Y);
board = cloneBoard;
ChangePlayer();
}
else
{
Logger.AddLine(GetCurrentPlayerNumber() + " -> It's not possible to move piece from: " + a.X + ", " + a.Y + " to " + b.X + ", " + b.Y);
}
}
private int MiniMaxFunction(Board node, int depth, bool isPlayerAMax, bool turnPlayerA)
{
if (depth <= 0 || node.IsWon())
{
return node.Evaluation(isPlayerAMax, turnPlayerA);
}
if (this.transtable)
{
if(table.IsCalculatedBefore(node, depth, isPlayerAMax, turnPlayerA))
return table.GetCalculatedValue(node, depth, isPlayerAMax, turnPlayerA);
}
int alpha = Int32.MinValue;
List<Board> possibleMoves = node.GenerateMoves(turnPlayerA);
turnPlayerA = !turnPlayerA;
if (possibleMoves.Count == 0)
throw new Exception();
foreach (Board board in possibleMoves)
{
if (turnPlayerA == isPlayerAMax)
{
if(board.IsTileMoved)
alpha = Math.Max(alpha, MiniMaxFunction(board, depth - 1, isPlayerAMax, !turnPlayerA));
else
alpha = Math.Max(alpha, MiniMaxFunction(board, depth - 1, isPlayerAMax, turnPlayerA));
}
else
{
if(board.IsTileMoved)
alpha = Math.Max(alpha, -MiniMaxFunction(board, depth - 1, isPlayerAMax, !turnPlayerA));
else
alpha = Math.Max(alpha, -MiniMaxFunction(board, depth - 1, isPlayerAMax, turnPlayerA));
}
}
if(this.transtable)
{
table.InsertCalculatedValue(node, depth, isPlayerAMax, !turnPlayerA, alpha);
}
return alpha;
}
/// <summary>
/// Evaluates the board
/// </summary>
/// <param name="board">Provided board</param>
/// <param name="isRed">Is player red's turn</param>
/// <returns></returns>
public static int Evaluate(Board board, bool isPlayerAMax, bool turnPlayerA)
{
// evaluation value
int lEvaluationValue = 0;
// starttime
DateTime lStartTime = DateTime.Now;
// if won, we don't have to do things
if (board.IsWon())
if (isPlayerAMax == turnPlayerA)
lEvaluationValue = -140;
else
lEvaluationValue = 140;
else
{
// check if tile moved, if so, return evaluation value of next board of tile moved
if (board.IsTileMoved)
{
List<Board> nextMoves = board.GenerateMoves(turnPlayerA);
if (nextMoves.Count > 0)
{
return nextMoves[0].Evaluation(isPlayerAMax, !turnPlayerA);
}
}
else
{
// tiles not moves, so we can continue here
List<PieceSituation> goodSituations = FindSituations(board.BoardSituation, turnPlayerA);
List<PieceSituation> badSituations = FindSituations(board.BoardSituation, !turnPlayerA);
if (goodSituations.Count > 0)
{
IOrderedEnumerable<PieceSituation> orderedGood = from e in goodSituations orderby e select e;
if (orderedGood.First() == PieceSituation.ThreeHeads)
lEvaluationValue = 100;
else if (orderedGood.First() == PieceSituation.ThreeHeadsWithSpace)
lEvaluationValue = 60;
else if (orderedGood.First() == PieceSituation.ThreeHeadsBlocked)
lEvaluationValue = 20;
}
else if (badSituations.Count > 0)
{
IOrderedEnumerable<PieceSituation> orderedBad = from e in badSituations orderby e select e;
if (orderedBad.First() == PieceSituation.ThreeHeads)
lEvaluationValue = -100;
else if (orderedBad.First() == PieceSituation.ThreeHeadsWithSpace)
lEvaluationValue = -60;
else if (orderedBad.First() == PieceSituation.ThreeHeadsBlocked)
lEvaluationValue = -20;
}
}
}
// add amount of head times 5 to eval value
int addToEval = 0;
if (turnPlayerA)
addToEval += 5 * board.RedHeads;
else
addToEval += 5 * board.WhiteHeads;
return (lEvaluationValue + addToEval);
}
/// <summary>
///
/// </summary>
/// <param name="board"></param>
public void IsMoveValid(Board board)
{
// IMPLEMENTATION NEEDED
}
/// <summary>
///
/// </summary>
/// <param name="toChange"></param>
/// <returns></returns>
private List<Board> NewBoardPosition(BoardPosition toChange)
{
List<Board> boards = new List<Board>();
for (int x = 0; x < 21; x++)
{
for (int y = 0; y < 20; y++)
{
if (boardPositions[x, y] == BoardPosition.Tile)
{
BoardPosition[,] newBoardPosition = (BoardPosition[,])boardPositions.Clone();
newBoardPosition[x, y] = toChange;
Board newBoard = new Board(newBoardPosition);
if (toChange == BoardPosition.RedTail)
{
newBoard.RedItems = this.RedItems + 1;
newBoard.WhiteItems = this.WhiteItems;
}
else
{
newBoard.RedItems = this.RedItems;
newBoard.WhiteItems = this.WhiteItems + 1;
}
newBoard.IsTileMoved = false;
boards.Add(newBoard);
}
}
}
return boards;
}
/// <summary>
/// sets the board
/// </summary>
/// <param name="board">the new board</param>
public void SetBoard(Board board)
{
if (IsEqual(this.board, board))
throw new Exception();
this.board = board;
}
/// <summary>
/// Evaluates the board
/// </summary>
/// <param name="board">Provided board</param>
/// <param name="isRed">Is player red's turn</param>
/// <returns></returns>
public static int Evaluate(Board board, bool isRed)
{
// evaluation value
int lEvaluationValue = 0;
// starttime
DateTime lStartTime = DateTime.Now;
// if won, we don't have to do things
if (board.IsWon())
lEvaluationValue = 1000000;
else
{
if (board.IsTileMoved)
{
List<Board> nextMoves = board.GenerateMoves(isRed);
if (nextMoves.Count == 1)
{
return nextMoves[0].Evaluation(isRed, isRed);
}
}
// temp values
int lEmptySpots = 0;
int lOwnHead = 0;
// temp value for storing the to be checked head position
BoardPosition lHead = BoardPosition.RedHead;
if (!isRed)
lHead = BoardPosition.WhiteHead;
// loop trough board
for (int x = 0; x < 21; x++)
{
for (int y = 0; y < 20; y++)
{
//if (boardPositions[x, y] == lHead)
// lOwnHead++;
#region "Check if piece belongs to current player"
bool lCheck = false;
if (board.BoardSituation[x, y] != BoardPosition.Empty && board.BoardSituation[x, y] != BoardPosition.Tile)
{
if (isRed)
{
if (board.BoardSituation[x, y] == BoardPosition.RedHead || board.BoardSituation[x, y] == BoardPosition.RedTail)
lCheck = true;
}
else if (!isRed)
{
if (board.BoardSituation[x, y] == BoardPosition.WhiteHead || board.BoardSituation[x, y] == BoardPosition.WhiteTail)
lCheck = true;
}
}
#endregion
if (lCheck)
{
#region "Left Column"
// x - -
// x - -
// x - -
if (x > 0)
{
// x - -
// - - -
// - - -
if (y > 0)
{
if (board.BoardSituation[x - 1, y - 1] == BoardPosition.Tile)
lEmptySpots++;
else if (board.BoardSituation[x - 1, y - 1] == lHead)
lOwnHead++;
}
// - - -
// x - -
// - - -
if (board.BoardSituation[x - 1, y] == BoardPosition.Tile)
lEmptySpots++;
else if (board.BoardSituation[x - 1, y] == lHead)
lOwnHead++;
// - - -
// - - -
// x - -
if (y < (20 - 1))
{
if (board.BoardSituation[x - 1, y + 1] == BoardPosition.Tile)
lEmptySpots++;
else if (board.BoardSituation[x - 1, y + 1] == lHead)
lOwnHead++;
}
}
#endregion
#region "Middle column"
// - x -
// - x -
// - x -
// - x -
// - - -
// - - -
if (y > 0)
{
if (board.BoardSituation[x, y - 1] == BoardPosition.Tile)
lEmptySpots++;
else if (board.BoardSituation[x, y - 1] == lHead)
lOwnHead++;
}
// - - -
// - x -
// - - -
// needs no check, is this position
// - - -
// - - -
// - x -
if (y < (20 - 1))
{
if (board.BoardSituation[x, y + 1] == BoardPosition.Tile)
lEmptySpots++;
else if (board.BoardSituation[x, y + 1] == lHead)
lOwnHead++;
}
#endregion
#region "Right column"
// - - x
// - - x
// - - x
if (x < (21 - 1))
{
// - - x
// - - -
// - - -
if (y > 0)
{
if (board.BoardSituation[x + 1, y - 1] == BoardPosition.Tile)
lEmptySpots++;
else if (board.BoardSituation[x + 1, y - 1] == lHead)
lOwnHead++;
}
// - - -
// - - x
// - - -
if (board.BoardSituation[x + 1, y] == BoardPosition.Tile)
lEmptySpots++;
else if (board.BoardSituation[x + 1, y] == lHead)
lOwnHead++;
// - - -
// - - -
// - - x
if (y < (20 - 1))
{
if (board.BoardSituation[x + 1, y + 1] == BoardPosition.Tile)
lEmptySpots++;
else if (board.BoardSituation[x + 1, y + 1] == lHead)
lOwnHead++;
}
}
#endregion
}
}
}
// calculate evalution value
int evalAdd = 0;
if (Game.Instance.CurrentPlayerNumPieces() > 0)
{
//evalAdd = (lEmptySpots * (lOwnHead / Game.Instance.CurrentPlayerNumPieces()));
evalAdd = lEmptySpots * (lOwnHead ^ 2);
}
lEvaluationValue = lEmptySpots + evalAdd;
}
#region "debug"
//DateTime lStopTime = DateTime.Now;
//TimeSpan lDiff = lStopTime - lStartTime;
//Logger.AddLine("Board -> Evaluation value: " + lEvaluationValue + " (calculated in: " + lDiff.TotalMilliseconds + " ms)");
#endregion
return lEvaluationValue;
}
/// <summary>
/// starts a new game with a startboard and a turningplayer
/// </summary>
/// <param name="playerA">playersettings of player A</param>
/// <param name="playerB">playersettings of player B</param>
/// <param name="startBoard">a board to start with</param>
/// <param name="startPlayer">player that turns first</param>
public void StartGame(PlayerSettings playerA, PlayerSettings playerB, Board startBoard, int startPlayer)
{
this.playerA = new AIPlayer(playerA);
this.playerB = new AIPlayer(playerB);
NumMovesA = 0;
NumMovesB = 0;
this.board = startBoard;
this.turnPlayerA = (startPlayer == 0 ? true : false);
Logger.AddLine("Start new game, with startboard and turningPlayer");
MakeAIMove();
}
public void InsertCalculatedValue(Board board, int depth, bool isPlayerAMax, bool turnPlayerA, int value)
{
Int64 hashKey = CreateHashKey(board, depth, isPlayerAMax, turnPlayerA);
int position = (int)Math.Abs((hashKey % tableSize));
HashObject hashObject = tableContent[position];
if (hashObject == null)
tableContent[position] = new HashObject(depth, hashKey, value, isPlayerAMax, turnPlayerA);
else
{
bool collision = true;
while (collision)
{
position = (int)Math.Abs((hashKey % tableSize));
hashObject = tableContent[position];
if (hashObject == null)
collision = false;
else if (hashObject.hashKey != hashKey || hashObject.isPlayerAMax != isPlayerAMax || hashObject.turnPlayerA != turnPlayerA)
TableResize();
else
collision = false;
}
tableContent[position] = new HashObject(depth, hashKey, value, isPlayerAMax, turnPlayerA);
}
}
/// <summary>
/// starts a new game
/// </summary>
/// <param name="playerA">playersettings of player A</param>
/// <param name="playerB">playersettings of player B</param>
public void StartGame(PlayerSettings playerA, PlayerSettings playerB)
{
this.playerA = new AIPlayer(playerA);
this.playerB = new AIPlayer(playerB);
NumMovesA = 0;
NumMovesB = 0;
// random first player
System.Random r = new System.Random();
int player = r.Next(1, 3);
turnPlayerA = true;
if (player == 2)
turnPlayerA = false;
board = new Board();
Logger.AddLine("Start new game");
MakeAIMove();
}
private Int64 CreateHashKey(Board board, int depth, bool isPlayerAMax, bool turnPlayerA)
{
Int64 result = 0;
if (isPlayerAMax)
result = result ^ playerAMax;
else
result = result ^ playerBMax;
if (turnPlayerA)
result = result ^ this.turnPlayerA;
else
result = result ^ turnPlayerB;
for (int x = 0; x < 21; x++)
{
for (int y = 0; y < 20; y++)
{
switch (board.BoardSituation[x, y])
{
case BoardPosition.Empty:
result = result ^ emptySpacesKeys[x, y];
break;
case BoardPosition.Tile:
result = result ^ tilesKeys[x, y];
break;
case BoardPosition.RedTail:
result = result ^ redTailKeys[x, y];
break;
case BoardPosition.RedHead:
result = result ^ redheadKeys[x, y];
break;
case BoardPosition.WhiteTail:
result = result ^ whiteTailKeys[x, y];
break;
case BoardPosition.WhiteHead:
result = result ^ whiteHeadKeys[x, y];
break;
}
}
}
return result;
}
private int AlphaBetaFunction(Board node, int depth, bool isPlayerAMax, bool turnPlayerA, int alphaEval, int betaEval)
{
if (node.IsWon() || depth <= 0)
{
return node.Evaluation(isPlayerAMax, turnPlayerA);
}
if (this.transtable)
{
if (table.IsCalculatedBefore(node, depth, isPlayerAMax, turnPlayerA))
return table.GetCalculatedValue(node, depth, isPlayerAMax, turnPlayerA);
}
int value = Int32.MinValue;
List<Board> possibleMoves = node.GenerateMoves(turnPlayerA);
turnPlayerA = !turnPlayerA;
if (isPlayerAMax == turnPlayerA)
possibleMoves = Order(possibleMoves, true, true);
else
possibleMoves = Order(possibleMoves, false, false);
foreach (Board board in possibleMoves)
{
if (turnPlayerA == isPlayerAMax)
{
if(board.IsTileMoved)
value = Math.Max(value, AlphaBetaFunction(board, depth - 1, isPlayerAMax, !turnPlayerA, alphaEval, betaEval));
else
value = Math.Max(value, AlphaBetaFunction(board, depth - 1, isPlayerAMax, turnPlayerA, alphaEval, betaEval));
alphaEval = Math.Max(value, alphaEval);
if (betaEval <= alphaEval)
{
if (this.transtable)
table.InsertCalculatedValue(node, depth, isPlayerAMax, !turnPlayerA, alphaEval);
return alphaEval;
}
}
else
{
if(board.IsTileMoved)
value = Math.Max(value, -AlphaBetaFunction(board, depth - 1, isPlayerAMax, !turnPlayerA, alphaEval, betaEval));
else
value = Math.Max(value, -AlphaBetaFunction(board, depth - 1, isPlayerAMax, turnPlayerA, alphaEval, betaEval));
betaEval = Math.Min(value, betaEval);
if (betaEval <= alphaEval)
{
if (this.transtable)
table.InsertCalculatedValue(node, depth, isPlayerAMax, !turnPlayerA, betaEval);
return betaEval;
}
}
}
if (this.transtable)
table.InsertCalculatedValue(node, depth, isPlayerAMax, !turnPlayerA, value);
return value;
}
public static void updateBoard()
{
// set calculation to true
calculating = true;
Thread.Sleep(50);
while (boardAnimating)
{
Thread.Sleep(50);
}
newBoard = UIConnector.Instance.GetBoard();
UIConnector.Instance.MaxAIMoves(aiMoves);
aiMoves++;
manager.currentBoard = newBoard.BoardSituation;
manager.redItems = newBoard.RedItems;
manager.whiteItems = newBoard.WhiteItems;
manager.SetupBoard();
// set calculation to false;
calculating = false;
Thread.Sleep(1450);
updateBoard();
}
/// <summary>
/// Does the next move
/// </summary>
/// <param name="currentBoard">Board to calculate best move</param>
/// <returns>Best boardsituation</returns>
public Board NextMove(Board currentBoard)
{
Board evaluationBoard = new Board();
bool evaluationBoardSet = false;
evaluationBoard.BoardSituation[0, 0] = BoardPosition.RedTail;
int valuelast = Int32.MinValue;
List<Board> sameHighest = new List<Board>();
int alpha = Int32.MinValue + 10;
int beta = Int32.MaxValue;
List<Board> moves = currentBoard.GenerateMoves(Game.Instance.GetTurn());
foreach (Board board in moves)
{
if (board.IsTileMoved)
alpha = AlphaBetaFunction(board, plieDepth, Game.Instance.GetTurn(), Game.Instance.GetTurn(), alpha, beta);
else
alpha = AlphaBetaFunction(board, plieDepth, Game.Instance.GetTurn(), !Game.Instance.GetTurn(), alpha, beta);
if (alpha > valuelast || !evaluationBoardSet)
{
sameHighest = new List<Board>();
sameHighest.Add(board);
evaluationBoard = board;
valuelast = alpha;
evaluationBoardSet = true;
}
else if (alpha == valuelast)
{
sameHighest.Add(board);
}
}
if (sameHighest.Count > 1 && sameHighest.Contains(evaluationBoard))
{
int highest = Int32.MinValue;
List<Board> highestOfTheHighest = new List<Board>();
foreach (Board board in sameHighest)
{
int eval = Int32.MinValue;
if(board.IsTileMoved)
eval = board.Evaluation(Game.Instance.GetTurn(), Game.Instance.GetTurn());
else
eval = board.Evaluation(Game.Instance.GetTurn(), !Game.Instance.GetTurn());
if (eval > highest)
{
highest = eval;
highestOfTheHighest = new List<Board>();
highestOfTheHighest.Add(board);
}
else if (eval == highest)
highestOfTheHighest.Add(board);
}
System.Random random = new System.Random();
evaluationBoard = highestOfTheHighest[random.Next(0, highestOfTheHighest.Count - 1)];
}
if (IsEqual(evaluationBoard, currentBoard))
throw new Exception();
Logger.AddLine("AB: boards with same value: " + sameHighest.Count + " of " + moves.Count + " moves");
Logger.AddLine("Board -> Evaluation value: " + evaluationBoard.Evaluation(Game.Instance.GetTurn(), Game.Instance.GetTurn()));
return evaluationBoard;
}
