I already posted this on a different forum, but since this is a very special problem, I will shared it here as play first post

The problem is: you are given a 20x20 chessboard, you are going to place as many queens as possible using the following rules:

You may place and only queens

each queen may attack maximum one other queen

The point system worked as: for the first twenty queens, you get 0 points, then for each queen you place, you get five points. And yes, you try to get as many points as possible.

For the question maker, they did have something more than 20...

Enjoy!