public override double ComputeHeuristicGrade() {

            double heuristic = 0.0;

            // Sprawdzenie wiersza
            for (int i = 0; i < 9; i++) {

                if (i == y)
                    continue;

                if (table[x, i] == 0.0)
                    heuristic++;

                else if (table[x, i] == newValue)
                    return Double.PositiveInfinity;
            }

            // Sprawdzenie kolumny
            for (int i = 0; i < 9; i++) {

                if (i == x)
                    continue;

                if (table[i, y] == 0.0)
                    heuristic++;

                else if (table[i, y] == newValue)
                    return Double.PositiveInfinity;
            }

            // Sprawdzanie kwadracika
            int r = x - (x % 3);
            int c = y - (y % 3);
            Console.WriteLine("r = {0}, c = {1}", r, c);

            for (int i = r; i < (r + 3); i++) {

                for (int j = c; j < (c + 3); j++) {

                    if ((i == x) && (j == y))
                        continue;

                    if (table[i, j] == 0.0)
                        heuristic++;

                    else if (table[i, j] == newValue)
                        return Double.PositiveInfinity;
                }
            }
            Console.WriteLine("Returnuje!");
            return heuristic;
        }