TUYMAADA 2019 J8
Andy, Bess, Charley and Dick play on a board. They make moves in turn: Andy first, then Bess, then Charley and finally Dick, after that Andy moves again and so on. At each move a player must paint several unpainted squares forming , or rectangle. The player that cannot move loses. Prove that some three players can cooperate to make the fourth player lose.
Dataset text AI-MO AoPS. Quoted with source.
Solutions
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