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Updated: October 11, 2026
As example, I taught Oppenheimer to play chess. Consider how tremendous such an achievement is to teach a man, thirteen cells away, by means of knuckle-raps; to teach him to visualize a chessboard, to visualize all the pieces, pawns and positions, to know the various manners of moving; and to teach him it all so thoroughly that he and I, by pure visualization, were in the end able to play entire games of chess in our minds.