public GameBoardState(GameBoardState boardToCopy)
{
mCount = boardToCopy.mCount;
nCount = boardToCopy.nCount;
kCount = boardToCopy.kCount;
boardState = new bool?[mCount, nCount];
MaxStoneCount = boardToCopy.MaxStoneCount;
CurrentStoneCount = boardToCopy.CurrentStoneCount;
for (int i = 0; i < mCount; i++)
{
for (int j = 0; j < nCount; j++)
{
boardState[i, j] = boardToCopy.boardState[i, j];
}
}
}
public GameBoard()
{
InitializeComponent();
int mCount = 4;
int nCount = 5;
int kCount = 4;
int start_x = 10;
int start_y = 20;
int CellWidth = 40;
int CellHeight = 40;
// initialize game board
for (int i = 0; i < mCount; i++)
{
for (int j = 0; j < nCount; j++)
{
Button cellButton = new Button();
cellButton.Top = start_x + i * CellHeight;
cellButton.Left = start_y + j * CellWidth;
cellButton.Width = CellWidth;
cellButton.Height = CellHeight;
cellButton.Text = "";
cellButton.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F,
System.Drawing.FontStyle.Regular,
System.Drawing.GraphicsUnit.Point, ((byte)(0)));
cellButton.Name = string.Format("button_{0}_{1}", i, j);
cellButton.Click += new EventHandler(cellClick);
cellButton.BackColor = Color.Gray;
this.boardPanel.Controls.Add(cellButton);
}
}
// human starts first
isMachine = false;
machineFirstMove = true;
this.gameBoardState = new GameBoardState(mCount, nCount, kCount);
}
void cellClick(object sender, EventArgs e)
{
Button clickedButton = sender as Button;
String[] tokens = clickedButton.Name.Split('_');
ClickOnButton(clickedButton);
List<String> configList = new List<String>();
// human plays a move
GameState gameState = this.gameBoardState.PerformClick(
int.Parse(tokens[1]), int.Parse(tokens[2]), isMachine, out configList);
UpdateBoardBasedOnState(gameState, configList);
// machine is on
if (isMachine)
{
int row = -1;
int column = -1;
// in all game levels, this is common
// if we have a chance to win by clicking anywhere, click
// else if we know of a cell where opponent can win by clicking
// we will try to stop
bool machineCanWin = this.gameBoardState.GetWinningCell(
isMachine, out row, out column);
if (machineCanWin)
{
gameUpdate(row, column, isMachine);
return;
}
bool humanCanWin = this.gameBoardState.GetWinningCell(
!isMachine, out row, out column);
if (humanCanWin)
{
gameUpdate(row, column, isMachine);
return;
}
// row and column are unchanged in this stage
// Hard strategy
GameBoardState machineTempBoardState = new GameBoardState(this.gameBoardState);
// try to figure out if machine wins in next one move
machineTempBoardState.GetBestCell(isMachine,
out row, out column);
int tempRow = row;
int tempColumn = column;
machineTempBoardState.PerformClick(row, column,
isMachine, out configList);
bool machineCanWinSecond = machineTempBoardState.GetWinningCell(isMachine, out row, out column);
// row and column changed twice
// first change started at GetBestCell
// second change started at GetWinningCell
// the change at GetBestCell should be saved
// if machne can win in one step
if (machineCanWinSecond || machineFirstMove)
{
row = tempRow;
column = tempColumn;
machineFirstMove = false;
}
// row and column is unchanged
// if the winning cell is unfound
else
{
// try to figure out if human wins in next two moves
GameBoardState humanTempBoardState = new GameBoardState(this.gameBoardState);
humanTempBoardState.GetBestCell(!isMachine, out row, out column);
tempRow = row;
tempColumn = column;
humanTempBoardState.PerformClick(row, column,
!isMachine, out configList);
bool humanCanWinSecond = humanTempBoardState.GetWinningCell(
!isMachine, out row, out column);
if (humanCanWinSecond)
{
row = tempRow;
column = tempColumn;
}
else
{
Console.WriteLine("Alpha Beta");
// Apply the Alpha Beta Pruning
GameBoardState alphaBetaBoardState = new GameBoardState(
this.gameBoardState);
// if this depth increases, the time will increases
// but there is a hard limit of 10 seconds
int[] bestMove = alphaBetaBoardState.Minimax(
20, isMachine, int.MinValue, int.MaxValue,
row, column, DateTime.Now);
row = bestMove[1];
column = bestMove[2];
}
}
gameUpdate(row, column, isMachine);
return;
}
}
