Test your chess: Reitstein problem 51

Black to play and win

RT Spencer v LR Reitstein 1946

Solution

Not too hard: examining all biffs quickly gets you to look after 1…Qf3+, when there is a single line solution. 2 gf[] Rf3+ 3 Kg2[] Bh3+ 4 Kg1 Rf1mate.

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