1. Based on an objective fact, it is a very arduous and time-consuming task to review whether the code of the competitor is illegal. The code and ideas of the toper are very complex, so depending reviewing the code will bring great uncertainty and fairness to the result.
2. As far as I know, the final rules are modified 2-3 weeks before the end of the challenge. I accidently found the modifications of latest version rules on the official website at the end of May, and there was no email to notify me that the rules have changed. Considering that I have already invested more than two months, and it is very unfair for me to change the rules before the end of the competition.
3. If the organizer really wants to ensure the fairness of the competition and does not introduce additional uncertainty caused by manual review, it is recommended to remove the rule number three and reopen the competition for 1-2 weeks.