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A lightweight four-mover featuring clever play from both sides.
With Black able to free his rook it is pointless to aim for a queen mate, so White must aim for a knight mate
on c7. Various routes are possible, and Black can only defend with 1...c2, threatening to promote with check
(if 1...Rd1 2.Qxd1). It appears that White can successfully deal with this defence by blocking c1 with his
queen, but Black has a subtle defence available. After, for example, 1.Sd8 c2 2.Qc1 b1B! 3.Se6 and Black is
stalemated. The correct key is 1.Sb4, threatening 2.Sd5, and after 1...c2 2.Qc1 b1B 3.Sd3
relieves the stalemate, leaving 3...exd3 4.Qh1.
Dafydd Johnston: The solver first notices that the knight has four different routes to c7. It's not clear which of these is the right one until we see the surprising stalemate defence on move 2, which must be anticipated by choosing 1. Sb4, leading to a nice role reversal between knight and queen. The term 'German logical problem' does not do justice to the degree of inventiveness, wit and aesthetic sense so often shown by its exponents.
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