Min Max algo on Tic Tac Toe

Questions & Answers
,
1

I don’t understand what is wrong here, because AI player is making move to next available spot and not the best one. Can anyone please help me?

Vector2 bestMove(){

    int bestVal  = -1000;
    Vector2 bestPosition= new Vector2(0,0);
    for (int i=0; i<_width; i++)
    {
        for(int j=0; j<_height; j++){
        Vector2 position = new Vector2(i,j);
        if (_tiles.GetValueOrDefault(position).GetComponentInChildren<Button>().GetComponent<Image>().sprite.name=="tile")
         {
             _tiles.GetValueOrDefault(position).GetComponentInChildren<Button>().GetComponent<Image>().sprite=oImage;
    
            int moveVal  = Minimax(_tiles,3,true);

            _tiles.GetValueOrDefault(position).GetComponentInChildren<Button>().GetComponent<Image>().sprite=tileImage;
            
            if(moveVal>bestVal){
              
                bestVal=moveVal;
                bestPosition=position;
            }          
           }
        }
    }

    return bestPosition;        
}

bool isMovesLeft(Dictionary<Vector2, Tile> tiles){
    for (int i=0; i<_width; i++)
    {
        for(int j=0; j<_height; j++){
        Vector2 position = new Vector2(i,j);
        if (tiles.GetValueOrDefault(position).GetComponentInChildren<Button>().GetComponent<Image>().sprite.name=="tile")
        {
            return true;
        }
        }
    }
    return false;
}

int Minimax (Dictionary<Vector2, Tile> tiles,int depth, bool isMaximazingPlayer){
    
   int score = EvaluateBoard(tiles);
  
    if(score==10 || score==-10 || depth==0){
        return  score;
    }

   if(isMovesLeft(tiles)==false){
       return 0;
   }

 if(isMaximazingPlayer){
      int bestScore = -1000;
      for (int i=0; i<_width; i++)
    {
        for(int j=0; j<_height; j++){
           Vector2 position = new Vector2(i,j); 
    
            if (_tiles.GetValueOrDefault(position).GetComponentInChildren<Button>().GetComponent<Image>().sprite.name=="tile")
            {
                _tiles.GetValueOrDefault(position).GetComponentInChildren<Button>().GetComponent<Image>().sprite = oImage;
                bestScore = Math.Max(bestScore, Minimax(tiles,depth-1,false));
                // reset the board
                _tiles.GetValueOrDefault(position).GetComponentInChildren<Button>().GetComponent<Image>().sprite=tileImage;
               
            }
        }
       
    }
    Debug.Log("bestScore Max Player: "+bestScore);
    return bestScore;
    
  } else {
     int bestScore = 1000;
        for (int i=0; i<_width; i++)
    {
        for(int j=0; j<_height; j++){
           Vector2 position = new Vector2(i,j); 
    
            if (_tiles.GetValueOrDefault(position).GetComponentInChildren<Button>().GetComponent<Image>().sprite.name=="tile")
            {
                _tiles.GetValueOrDefault(position).GetComponentInChildren<Button>().GetComponent<Image>().sprite = xImage;
                bestScore = Math.Min(bestScore, Minimax(tiles,depth-1,true));
                // reset the board
                _tiles.GetValueOrDefault(position).GetComponentInChildren<Button>().GetComponent<Image>().sprite=tileImage;

               
            }
        }
       
    }
    Debug.Log("bestScore Min Player: "+bestScore);
    return bestScore;
  }
   
}