private int GetScore(int winner, int aiPlayerIdentifier, DifficultyOptions.Options difficulty)
{
int score;
if (winner == 1)
{
score = 10;
if (difficulty == DifficultyOptions.Options.Easy)
{
score = getRamdomNumber(difficulty, score);
}
}
else if (winner == 2)
{
score = -10;
if (difficulty != DifficultyOptions.Options.Hard)
{
score = getRamdomNumber(difficulty, score);
}
}
else
{
score = 0;
}
return(score);
}
private int getRamdomNumber(DifficultyOptions.Options difficulty, int value)
{
int randomNumber;
if (difficulty == DifficultyOptions.Options.Easy)
{
randomNumber = Random.Range(0, 10);
return(randomNumber);
}
else
{
if (Random.value <= 0.3)
{
return(value * -1);
}
else
{
return(value);
}
}
}
private Dictionary <string, int> GetBestMove(Game game, int alpha, int beta, int depth, DifficultyOptions.Options difficulty)
{
Dictionary <string, int> result = new Dictionary <string, int>();
if (game.IsOver || depth == 0)
{
result["score"] = GetScore(game.Winner, game.Player1.Id, difficulty);
return(result);
}
List <int> pMoves = new List <int>();
int bestScore = 0;
int score;
int bestMove = 0;
pMoves = game.GetPossibleMoves();
if (pMoves.Count > 0)
{
for (int i = 0; i < pMoves.Count; i++)
{
Game cloneGame = game.Clone();
cloneGame.CurrentPlayer = game.CurrentPlayer;
cloneGame.MakeMove(pMoves[i]);
score = GetBestMove(cloneGame, alpha, beta, depth - 1, difficulty)["score"];
if (i == 0)
{
bestScore = score;
bestMove = pMoves[i];
}
if (game.CurrentPlayer.Type == PlayerType.AIPlayer)
{
//MAX
if (bestScore < score)
{
bestScore = score;
bestMove = pMoves[i];
}
if (score >= beta)
{
break;
}
alpha = alpha > score ? alpha : score;
}
else
{
//MIN
if (bestScore > score)
{
bestScore = score;
bestMove = pMoves[i];
}
if (score <= alpha)
{
break;
}
beta = beta < score ? beta : score;
}
}
result["bestMove"] = bestMove;
result["score"] = bestScore;
}
else
{
result["score"] = 0;
}
return(result);
}
public int MakePlay(Game game, DifficultyOptions.Options difficulty)
{
Dictionary <string, int> result = GetBestMove(game, -99, 99, 8, difficulty);
return(result["bestMove"]);
}
