static int CalculateMoves(GameBoard board)
{
/* goes through all the possible moves
* on a gameboard
* returns number of moves
*/
int moves = 0;
Colour player_colour = Colour.NONE;
GameBoard.MinMax child_type = GameBoard.MinMax.Null;
if (board.GetNodeType() == GameBoard.MinMax.Max)
{
player_colour = Colour.BLACK;
child_type = GameBoard.MinMax.Min;
}else if (board.GetNodeType() == GameBoard.MinMax.Min)
{
player_colour = Colour.WHITE;
child_type = GameBoard.MinMax.Max;
}
for (int x = 0; x <= 3; x++)
{
for (int y = 0; y <= 3; y++)
{
if (board.ReturnPosition(x,y).stones > 0 && board.ReturnPosition(x,y).colour == player_colour)
{
//if statement to sort number of stones
//1-2 stones = 1 square
if (board.ReturnPosition(x, y).stones == 1 || board.ReturnPosition(x, y).stones == 2)
{
//north
int a = x;
int b = y + 1;
moves = CheckAdjacentMove(board, child_type, player_colour, x, y, a, b, moves);
//south
a = x;
b = y - 1;
moves = CheckAdjacentMove(board, child_type, player_colour, x, y, a, b, moves);
//east
a = x - 1;
b = y;
moves = CheckAdjacentMove(board, child_type, player_colour, x, y, a, b, moves);
//west
a = x + 1;
b = y;
moves = CheckAdjacentMove(board, child_type, player_colour, x, y, a, b, moves);
//ne
a = x + 1;
b = y - 1;
moves = CheckAdjacentMove(board, child_type, player_colour, x, y, a, b, moves);
//nw
a = x - 1;
b = y - 1;
moves = CheckAdjacentMove(board, child_type, player_colour, x, y, a, b, moves);
//se
a = x + 1;
b = y + 1;
moves = CheckAdjacentMove(board, child_type, player_colour, x, y, a, b, moves);
//sw
a = x - 1;
b = y + 1;
moves = CheckAdjacentMove(board, child_type, player_colour, x, y, a, b, moves);
}
else if (board.ReturnPosition(x, y).stones == 3)//3 stones = 2 squares
{
//north x2
int a = x;
int b = y + 1;
int c = x;
int d = y + 2;
moves = CheckTwoSquares(board, child_type, player_colour, x, y, a, b, c, d, moves);
//south x2
a = x;
b = y - 1;
c = x;
d = y - 2;
moves = CheckTwoSquares(board, child_type, player_colour, x, y, a, b, c, d, moves);
//eastx2
a = x - 1;
b = y;
c = x - 2;
d = y;
moves = CheckTwoSquares(board, child_type, player_colour, x, y, a, b, c, d, moves);
//westx2
a = x + 1;
b = y;
c = x + 2;
d = y;
moves = CheckTwoSquares(board, child_type, player_colour, x, y, a, b, c, d, moves);
//nex2
a = x + 1;
b = y - 1;
c = x + 2;
d = y - 2;
moves = CheckTwoSquares(board, child_type, player_colour, x, y, a, b, c, d, moves);
//nwx2
a = x - 1;
b = y - 1;
c = x - 2;
d = y - 2;
moves = CheckTwoSquares(board, child_type, player_colour, x, y, a, b, c, d, moves);
//se x2
a = x + 1;
b = y + 1;
c = x + 2;
d = y + 2;
moves = CheckTwoSquares(board, child_type, player_colour, x, y, a, b, c, d, moves);
//swx2
a = x - 1;
b = y + 1;
c = x - 2;
d = y + 2;
moves = CheckTwoSquares(board, child_type, player_colour, x, y, a, b, c, d, moves);
}
else // 4+ stones = 3 squares
{
//north x3
int a = x;
int b = y + 1;
int c = x;
int d = y + 2;
int e = x;
int f = y + 3;
moves = CheckThreeSquares(board, child_type, player_colour, x, y, a, b, c, d, e, f, moves);
//south x3
a = x;
b = y - 1;
c = x;
d = y - 2;
e = x;
f = y - 3;
moves = CheckThreeSquares(board, child_type, player_colour, x, y, a, b, c, d, e, f, moves);
//westx3
a = x - 1;
b = y;
c = x - 2;
d = y;
e = x - 3;
f = y;
moves = CheckThreeSquares(board, child_type, player_colour, x, y, a, b, c, d, e, f, moves);
//eastx3
a = x + 1;
b = y;
c = x + 2;
d = y;
e = x + 3;
f = y;
moves = CheckThreeSquares(board, child_type, player_colour, x, y, a, b, c, d, e, f, moves);
//nex3
a = x + 1;
b = y + 1;
c = x + 2;
d = y + 2;
e = x + 3;
f = y + 3;
moves = CheckThreeSquares(board, child_type, player_colour, x, y, a, b, c, d, e, f, moves);
//nwx3 //---------????
a = x - 1;
b = y + 1;
c = x - 2;
d = y + 2;
e = x - 3;
f = y + 3;
moves = CheckThreeSquares(board, child_type, player_colour, x, y, a, b, c, d, e, f, moves);
//se x3
a = x + 1;
b = y - 1;
c = x + 2;
d = y - 2;
e = x + 3;
f = y - 3;
moves = CheckThreeSquares(board, child_type, player_colour, x, y, a, b, c, d, e, f, moves);
//swx3
a = x - 1;
b = y - 1;
c = x - 2;
d = y - 2;
e = x - 3;
f = y - 3;
moves = CheckThreeSquares(board, child_type, player_colour, x, y, a, b, c, d, e, f, moves);
}
}
}
}
//store moves in parent - number of squares covereed - failed eval fxn
/* int squares = 0;
for (int x = 0; x < 4; x++)
{
for (int y = 0; y < 4; y++)
{
if (board.ReturnPosition(x, y).colour == player_colour)
{
squares++;
}
}
}
board.SetAlphaBetaValue(squares);
return squares;
*/
board.SetAlphaBetaValue(moves);
return moves;
}
static GameBoard CalculateMaxMove(GameBoard parent)
{
/* Alpha values are stored in the max nodes
* Alpha value = max(children's Beta Values of min nodes)
* Because we want to minimize opponent moves *
*/
if (parent.GetChildren().Count <= 0)
{
CalculateMoves(parent);
}
GameBoard best_child = null;
if (parent.GetChildren().Count > 0)
{
best_child = parent.GetChildren().ElementAt(0); //best is first child
foreach (GameBoard child in parent.GetChildren())
{
if (CalculateMoves(child) >= parent.GetAlphaBetaValue()) //get max
{
best_child = child; //new best child
parent.SetAlphaBetaValue(best_child.GetAlphaBetaValue());
}
}
return best_child;
}
return null;
}
static GameBoard CalculateMinMove(GameBoard parent)
{
/* Beta values are stored in the min nodes
* Beta value = min(alpha Values of max nodes)
* Because we want to maximize our moves
*
*/
if (parent.GetChildren().Count <= 0)
{
CalculateMoves(parent);
}
GameBoard worst_child = null;
if (parent.GetChildren().Count > 0)
{
worst_child = parent.GetChildren().ElementAt(0);
foreach (GameBoard child in parent.GetChildren())
{
if (CalculateMoves(child) <= parent.GetAlphaBetaValue())
{
worst_child = child;
parent.SetAlphaBetaValue(worst_child.GetAlphaBetaValue());
}
}
return worst_child;
}
return null;
}
static void AlphaBetaSearch()
{
GameBoard parent = new GameBoard();
parent.SetNodeType(GameBoard.MinMax.Min);
int total_moves = 0;
Console.WriteLine("Starting move:");
displayBoard(parent);
CalculateMoves(parent);
bool turn = false; //turn 0 = player's turn(black,min), turn 1 = our turn(white,max)
GameBoard next_move = parent;
while (total_moves < 5000)
{
if (turn == false)//their turn (BLACK)
{
Console.WriteLine("Their Move / Player 1");
//next_move = CalculateBeta(parent);
//Random Agent :(
//choose random child
if (parent.GetChildren().Count <= 0)
{
CalculateMoves(parent);
}
if (parent.GetChildren().Count <= 0)
{
break; //win condition for player 2
}
Random random_number = new Random();
int black_move = random_number.Next(parent.GetChildren().Count - 1);
next_move = parent.GetChildren().ElementAt(black_move);
turn = true;
}
else //my move (WHITE)
{
Console.WriteLine("My Move / Player 2");
//next_move = null;
int best = 100000;
if (parent.GetChildren().Count <= 0)
{
CalculateMoves(parent);
}
if (parent.GetChildren().Count <= 0)
{
break; //win condition for player 1
}
//the parent is a max node (next_move)
//the children are min nodes
Collection<GameBoard> potentialMoves = new Collection<GameBoard>();
foreach (GameBoard child in parent.GetChildren())
{
CalculateAlphaBeta(child, 3, -100000, best, GameBoard.MinMax.Min);
if (child.GetAlphaBetaValue() < best)
{
best = child.GetAlphaBetaValue();
potentialMoves.Clear();
potentialMoves.Add(child);
}
else if (child.GetAlphaBetaValue() == best)
{
potentialMoves.Add(child);
}
}
Random random_number = new Random();
int white_move = random_number.Next(potentialMoves.Count - 1);
next_move = potentialMoves.ElementAt(white_move);
potentialMoves.Clear();
parent.SetAlphaBetaValue(best);
//System.GC.Collect();
turn = false;
}
//each move
Console.WriteLine("Move #: " + total_moves);
displayBoard(next_move);
parent = next_move;
total_moves++;
next_move.SetParent(null);
System.GC.Collect();
}
//WINNER
if (next_move.GetNodeType() == GameBoard.MinMax.Max)
{
Console.WriteLine("Player 1 wins");
}
else
{
Console.WriteLine("Computer wins");
}
}
