International Mathematical Olympiad (IMO) is an annual Mathematics competition for pre-college students. IMO was first held in 1959, and in 2019, over 100 countries participated in the event. Today, we are going over problem 4 from 2018 IMO.
The problem is as follows: 2 players taking turn placing stones on a 20x20 board under some rules. The game stops if a player can no longer place a stone. Find the number of stones that the first players can always place.
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