public static int Negamax_AlphaBeta(Node node, int d, int alpha, int beta){

        int value;
        int count = 0;

        if(d==0 || node.equals(null)){
            return node.getScore();
        }

        int bestValue = -Integer.MAX_VALUE;

        for(Node child: node.childNode){
            value = -Negamax_AlphaBeta(child, d-1, -alpha, -beta);
            bestValue = Math.max(bestValue, value);
            alpha = Math.max(alpha, value);
            count++;
            if(alpha >= beta){
                break;
            }
        }
        node.setCount(count);
        return bestValue;
    }