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It's in one of his books, (I dont think he invented it), entitled Mathematical Puzzles and Diversions, or something like that. It's an added dimension of potential cubes.
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)