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Miscellaneous Problems

Solution

Raymond Smullyan
The Chess Mysteries of Sherlock Holmes, 1979
(After Mortensen)

[k1K5/88888/7P/6B1]

3+1. What did Black just play?

Solution: Black did move his King (what else?) From a7 (where else?)

On a7 he was under a seemingly impossible check by wBg1. In fact this check was a discovered check, and the discoverer has now disappeared. It has disappeared because it has just been captured by the black King. Ergo it was a wN.

Last move was -1. Ka7xNa8, after Wh. played Nb6-(x)a8. A very economical Type B problem.