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Here's that cliche again about Chess and the number of atoms in the
universe. In the next to last paragraph of current article they bracket it,
like it's an everyday measure, the Carlsen article ''must read:''
http://www.chessbase.com/.
Great Shatranj has that many permutations too, and so does let's see, Schoolbook by Trenholme here \|/ and Black Ghost by Betza /|\. There's something stricken by the repetition.