public float positionEvaluation(Position p, boolean player) {
        int count = 0;
        TicTacToePosition pos = (TicTacToePosition) p;
        for (int i = 0; i < 9; i++) {
            if (pos.board[i] == 0) count++;
        }
        count = 10 - count;
        // prefer the center square:
        float base = 1.0f;
        if (pos.board[4] == TicTacToePosition.HUMAN &&
                player) {
            base += 0.4f;
        }
        if (pos.board[4] == TicTacToePosition.PROGRAM &&
                !player) {
            base -= 0.4f;
        }
        float ret = (base - 1.0f);
        if (wonPosition(p, player)) {
            return base + (1.0f / count);
        }
        if (wonPosition(p, !player)) {
            return -(base + (1.0f / count));
        }
        return ret;
    }