Black and White

crypton chess puzzle

An old puzzle by Paul Hoffman from Science Digest. Dr. Crypton is playing chess with his boss. Crypton has the white pieces. What move can he play that will not checkmate Black? There’s no funny business; the problem is just what it seems, except that Crypton has promised never to put a knight on any square adjacent to the black king, so 1. Ne6 doesn’t count as a solution.

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