Chess games are in their training set, other games are not.
Chess is representable entirely in text as well, and generally speaking the LLM concept of "picking the next best token" fits pretty well for "picking the next best move" where a move is a text token
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Chess is representable entirely in text as well, and generally speaking the LLM concept of "picking the next best token" fits pretty well for "picking the next best move" where a move is a text token