public Position determineMove(TicTacToeBoard state, TicTacToeBoard otherState)
{
for (int i = 0; i < state.boardConfig.GetLength(0); i++)
{
for (int j = 0; j < state.boardConfig.GetLength(1); j++)
{
if (state.boardConfig[i, j] != otherState.boardConfig[i, j])
{
Position newPos = new Position(i, j);
return(newPos);
}
}
}
return(null);
}
public TicTacToeBoard copy( )
{
TicTacToeBoard copyBoard = new TicTacToeBoard( );
copyBoard.alpha = this.alpha;
copyBoard.beta = this.beta;
for (int i = 0; i < boardConfig.GetLength(0); i++)
{
for (int j = 0; j < boardConfig.GetLength(1); j++)
{
copyBoard.boardConfig[i, j] = this.boardConfig[i, j];
}
}
return(copyBoard);
}
//reset instead of closing and opening game
private void Reset()
{
//reset all instances of globals
oTurn = true;
playerTurn = true;
playerSelected = false;
newBoard = new TicTacToeBoard( );
aiChoices = new List <TicTacToeBoard>();
won = null;
aDraw = false;
xWins = false;
oWins = false;
}
//test if we are in a terminal state
private bool TerminalTest(TicTacToeBoard state)
{
//Terminal State if we win
Position[] winStates = WinState(state);
if (winStates != null)
{
return(true);
}
//if not win, if the parts of the board is empty, game doesn't end
for (int i = 0; i < state.boardConfig.GetLength(0); i++)
{
for (int j = 0; j < state.boardConfig.GetLength(1); j++)
{
if (state.boardConfig[i, j] == 0)
{
return(false);
}
}
}
//board is full, terminal state and we didn't win
return(true);
}
//get the children from current state
private Queue <TicTacToeBoard> GenerateSuccessors(TicTacToeBoard state, ref bool tempOTurn, ref int counter)
{
Queue <TicTacToeBoard> children = new Queue <TicTacToeBoard>();
for (int i = 0; i < state.boardConfig.GetLength(0); i++)
{
for (int j = 0; j < state.boardConfig.GetLength(1); j++)
{
TicTacToeBoard copy = state.copy();
if (copy.boardConfig[i, j] == 0)
{
if (counter == 0)
{
aiChoices.Add(copy);
}
copy.boardConfig[i, j] = (tempOTurn ? 1 : 2);
children.Enqueue(copy);
}
}
}
counter++;
return(children);
}
private int Min_value(ref TicTacToeBoard state, ref bool tempOTurn, ref int counter, int depth)
{
if ((depth == 4) || TerminalTest(state))
{
return(utility(ref state, depth, ref tempOTurn));
}
int v = 1000;
Queue <TicTacToeBoard> children = GenerateSuccessors(state, ref tempOTurn, ref counter);
while (children.Count != 0)
{
TicTacToeBoard next = children.Dequeue();
tempOTurn = !tempOTurn;
v = Math.Min(v, Max_value(ref next, ref tempOTurn, ref counter, depth));
state.cost = v;
if (v <= state.alpha)
{
return(v);
}
state.beta = Math.Min(v, state.beta);
}
return(v);
}
//utility function of Alpha beta pruning - will only enter is terminal state
private int utility(ref TicTacToeBoard state, int depth, ref bool tempOTurn) //replace this with file input of all possible states - and weights
{
int cost = 0;
for (int i = 0; i < state.boardConfig.GetLength(0); i++)
{
for (int j = 0; j < state.boardConfig.GetLength(1); j++)
{
if (oTurn)
{
if (state.boardConfig[i, j] == 1)
{
if (i + 1 < state.boardConfig.GetLength(0))
{
if (i + 2 < state.boardConfig.GetLength(0))
{
if (state.boardConfig[i + 2, j] == state.boardConfig[i + 1, j] &&
state.boardConfig[i + 1, j] == state.boardConfig[i, j])
{
cost += 100;
}
}
else
if (state.boardConfig[i + 1, j] == state.boardConfig[i, j])
{
if (i - 1 >= 0 && state.boardConfig[i - 1, j] != state.boardConfig[i, j])
{
cost += 10;
}
}
}
if (j + 1 < state.boardConfig.GetLength(1))
{
if (j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i, j + 2] == state.boardConfig[i, j + 1] &&
state.boardConfig[i, j + 1] == state.boardConfig[i, j])
{
cost += 100;
}
}
else
if (state.boardConfig[i, j + 1] == state.boardConfig[i, j])
{
if (j - 1 >= 0 && state.boardConfig[i, j - 1] != state.boardConfig[i, j])
{
cost += 10;
}
}
}
if (i + 1 < state.boardConfig.GetLength(0) && j + 1 < state.boardConfig.GetLength(1))
{
if (i + 2 < state.boardConfig.GetLength(0) && j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i + 2, j + 2] == state.boardConfig[i + 1, j + 1] &&
state.boardConfig[i + 1, j + 1] == state.boardConfig[i, j])
{
cost += 100;
}
}
else
if (state.boardConfig[i + 1, j + 1] == state.boardConfig[i, j])
{
if (i - 1 >= 0 && j - 1 >= 0 && state.boardConfig[i - 1, j - 1] != state.boardConfig[i, j])
{
cost += 10;
}
}
}
if (i - 1 >= 0 && j + 1 < state.boardConfig.GetLength(1))
{
if (i - 2 >= 0 && j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i - 2, j + 2] == state.boardConfig[i - 1, j + 1] &&
state.boardConfig[i - 1, j + 1] == state.boardConfig[i, j])
{
cost += 100;
}
}
else
if (state.boardConfig[i - 1, j + 1] == state.boardConfig[i, j])
{
if (i + 1 < state.boardConfig.GetLength(0) && j - 1 >= 0 &&
state.boardConfig[i + 1, j - 1] != state.boardConfig[i, j])
{
cost += 10;
}
}
}
}
else if (state.boardConfig[i, j] == 2)
{
if (i + 1 < state.boardConfig.GetLength(0))
{
if (i + 2 < state.boardConfig.GetLength(0))
{
if (state.boardConfig[i + 2, j] == state.boardConfig[i + 1, j] &&
state.boardConfig[i + 1, j] == state.boardConfig[i, j])
{
cost -= 100;
}
}
else
if (state.boardConfig[i + 1, j] == state.boardConfig[i, j])
{
if (i - 1 >= 0 && state.boardConfig[i - 1, j] != state.boardConfig[i, j])
{
cost -= 10;
}
}
}
if (j + 1 < state.boardConfig.GetLength(1))
{
if (j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i, j + 2] == state.boardConfig[i, j + 1] &&
state.boardConfig[i, j + 1] == state.boardConfig[i, j])
{
cost -= 100;
}
}
else
if (state.boardConfig[i, j + 1] == state.boardConfig[i, j])
{
if (j - 1 >= 0 && state.boardConfig[i, j - 1] != state.boardConfig[i, j])
{
cost -= 10;
}
}
}
if (i + 1 < state.boardConfig.GetLength(0) && j + 1 < state.boardConfig.GetLength(1))
{
if (i + 2 < state.boardConfig.GetLength(0) && j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i + 2, j + 2] == state.boardConfig[i + 1, j + 1] &&
state.boardConfig[i + 1, j + 1] == state.boardConfig[i, j])
{
cost -= 100;
}
}
else
if (state.boardConfig[i + 1, j + 1] == state.boardConfig[i, j])
{
if (i - 1 >= 0 && j - 1 >= 0 && state.boardConfig[i - 1, j - 1] != state.boardConfig[i, j])
{
cost -= 10;
}
}
}
if (i - 1 >= 0 && j + 1 < state.boardConfig.GetLength(1))
{
if (i - 2 >= 0 && j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i - 2, j + 2] == state.boardConfig[i - 1, j + 1] &&
state.boardConfig[i - 1, j + 1] == state.boardConfig[i, j])
{
cost -= 100;
}
}
else
if (state.boardConfig[i - 1, j + 1] == state.boardConfig[i, j])
{
if (i + 1 < state.boardConfig.GetLength(0) && j - 1 >= 0 &&
state.boardConfig[i + 1, j - 1] != state.boardConfig[i, j])
{
cost -= 10;
}
}
}
}
}
else if (!oTurn)
{
if (state.boardConfig[i, j] == 2)
{
if (i + 1 < state.boardConfig.GetLength(0))
{
if (i + 2 < state.boardConfig.GetLength(0))
{
if (state.boardConfig[i + 2, j] == state.boardConfig[i + 1, j] &&
state.boardConfig[i + 1, j] == state.boardConfig[i, j])
{
cost += 100;
}
}
else
if (state.boardConfig[i + 1, j] == state.boardConfig[i, j])
{
if (i - 1 >= 0 && state.boardConfig[i - 1, j] != state.boardConfig[i, j])
{
cost += 10;
}
}
}
if (j + 1 < state.boardConfig.GetLength(1))
{
if (j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i, j + 2] == state.boardConfig[i, j + 1] &&
state.boardConfig[i, j + 1] == state.boardConfig[i, j])
{
cost += 100;
}
}
else
if (state.boardConfig[i, j + 1] == state.boardConfig[i, j])
{
if (j - 1 >= 0 && state.boardConfig[i, j - 1] != state.boardConfig[i, j])
{
cost += 10;
}
}
}
if (i + 1 < state.boardConfig.GetLength(0) && j + 1 < state.boardConfig.GetLength(1))
{
if (i + 2 < state.boardConfig.GetLength(0) && j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i + 2, j + 2] == state.boardConfig[i + 1, j + 1] &&
state.boardConfig[i + 1, j + 1] == state.boardConfig[i, j])
{
cost += 100;
}
}
else
if (state.boardConfig[i + 1, j + 1] == state.boardConfig[i, j])
{
if (i - 1 >= 0 && j - 1 >= 0 && state.boardConfig[i - 1, j - 1] != state.boardConfig[i, j])
{
cost += 10;
}
}
}
if (i - 1 >= 0 && j + 1 < state.boardConfig.GetLength(1))
{
if (i - 2 >= 0 && j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i - 2, j + 2] == state.boardConfig[i - 1, j + 1] &&
state.boardConfig[i - 1, j + 1] == state.boardConfig[i, j])
{
cost += 100;
}
}
else
if (state.boardConfig[i - 1, j + 1] == state.boardConfig[i, j])
{
if (i + 1 < state.boardConfig.GetLength(0) && j - 1 >= 0 &&
state.boardConfig[i + 1, j - 1] != state.boardConfig[i, j])
{
cost += 10;
}
}
}
}
else if (state.boardConfig[i, j] == 1)
{
if (i + 1 < state.boardConfig.GetLength(0))
{
if (i + 2 < state.boardConfig.GetLength(0))
{
if (state.boardConfig[i + 2, j] == state.boardConfig[i + 1, j] &&
state.boardConfig[i + 1, j] == state.boardConfig[i, j])
{
cost -= 100;
}
}
else
if (state.boardConfig[i + 1, j] == state.boardConfig[i, j])
{
if (i - 1 >= 0 && state.boardConfig[i - 1, j] != state.boardConfig[i, j])
{
cost -= 10;
}
}
}
if (j + 1 < state.boardConfig.GetLength(1))
{
if (j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i, j + 2] == state.boardConfig[i, j + 1] &&
state.boardConfig[i, j + 1] == state.boardConfig[i, j])
{
cost -= 100;
}
}
else
if (state.boardConfig[i, j + 1] == state.boardConfig[i, j])
{
if (j - 1 >= 0 && state.boardConfig[i, j - 1] != state.boardConfig[i, j])
{
cost -= 10;
}
}
}
if (i + 1 < state.boardConfig.GetLength(0) && j + 1 < state.boardConfig.GetLength(1))
{
if (i + 2 < state.boardConfig.GetLength(0) && j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i + 2, j + 2] == state.boardConfig[i + 1, j + 1] &&
state.boardConfig[i + 1, j + 1] == state.boardConfig[i, j])
{
cost -= 100;
}
}
else
if (state.boardConfig[i + 1, j + 1] == state.boardConfig[i, j])
{
if (i - 1 >= 0 && j - 1 >= 0 && state.boardConfig[i - 1, j - 1] != state.boardConfig[i, j])
{
cost -= 10;
}
}
}
if (i - 1 >= 0 && j + 1 < state.boardConfig.GetLength(1))
{
if (i - 2 >= 0 && j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i - 2, j + 2] == state.boardConfig[i - 1, j + 1] &&
state.boardConfig[i - 1, j + 1] == state.boardConfig[i, j])
{
cost -= 100;
}
}
else
if (state.boardConfig[i - 1, j + 1] == state.boardConfig[i, j])
{
if (i + 1 < state.boardConfig.GetLength(0) && j - 1 >= 0 &&
state.boardConfig[i + 1, j - 1] != state.boardConfig[i, j])
{
cost -= 10;
}
}
}
}
}
}
}
state.cost = cost;
return(cost);
}
//test if we have won
private Position[] WinState(TicTacToeBoard state)
{
//loop through everything in the game board - check for win states
for (int i = 0; i < state.boardConfig.GetLength(0); i++)
{
for (int j = 0; j < state.boardConfig.GetLength(1); j++)
{
//check if current position in empty
if (state.boardConfig[i, j] != 0)
{
if (i - 2 >= 0 && j - 2 >= 0)
{
if (state.boardConfig[i - 2, j - 2] == state.boardConfig[i - 1, j - 1] &&
state.boardConfig[i - 1, j - 1] == state.boardConfig[i, j])
{
return(new Position[] { new Position(i - 2, j - 2), new Position(i - 1, j - 1), new Position(i, j) });
}
}
if (j - 2 >= 0)
{
if (state.boardConfig[i, j - 2] == state.boardConfig[i, j - 1] &&
state.boardConfig[i, j - 1] == state.boardConfig[i, j])
{
return(new Position[] { new Position(i - 2, j), new Position(i - 1, j), new Position(i, j) });
}
}
if (i + 2 < state.boardConfig.GetLength(0) && j - 2 >= 0)
{
if (state.boardConfig[i + 2, j - 2] == state.boardConfig[i + 1, j - 1] &&
state.boardConfig[i + 1, j - 1] == state.boardConfig[i, j])
{
return(new Position[] { new Position(i + 2, j - 2), new Position(i + 1, j - 1), new Position(i, j) });
}
}
if (i - 2 >= 0)
{
if (state.boardConfig[i - 2, j] == state.boardConfig[i - 1, j] &&
state.boardConfig[i - 1, j] == state.boardConfig[i, j])
{
return(new Position[] { new Position(i - 2, j), new Position(i - 1, j), new Position(i, j) });
}
}
if (i + 2 < state.boardConfig.GetLength(0))
{
if (state.boardConfig[i + 2, j] == state.boardConfig[i + 1, j] &&
state.boardConfig[i + 1, j] == state.boardConfig[i, j])
{
return(new Position[] { new Position(i + 2, j), new Position(i + 1, j), new Position(i, j) });
}
}
if (i - 2 >= 0 && j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i - 2, j + 2] == state.boardConfig[i - 1, j + 1] &&
state.boardConfig[i - 1, j + 1] == state.boardConfig[i, j])
{
return(new Position[] { new Position(i - 2, j + 2), new Position(i - 1, j + 1), new Position(i, j) });
}
}
if (j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i, j + 2] == state.boardConfig[i, j + 1] &&
state.boardConfig[i, j + 1] == state.boardConfig[i, j])
{
return(new Position[] { new Position(i, j + 2), new Position(i, j + 1), new Position(i, j) });
}
}
if (i + 2 < state.boardConfig.GetLength(0) && j + 2 < state.boardConfig.GetLength(1))
{
if (state.boardConfig[i + 2, j + 2] == state.boardConfig[i + 1, j + 1] &&
state.boardConfig[i + 1, j + 1] == state.boardConfig[i, j])
{
return(new Position[] { new Position(i + 2, j + 2), new Position(i + 1, j + 1), new Position(i, j) });
}
}
}
}
}
//did not reach a win state
return(null);
}