Test your chess: Reitstein problem 91

White to play

E Bergendorff v D Walt 1940

Solution

White's situation is desperate, so you have to look at 1 Qf7+ and 1 Qf8+!, with the latter, since it takes something, being the first to try. It shouldn't take too long to see that with best play it is then a perpetual: 1…Bf8[] 2 Rf7+ Kh8 (2…Kg8?? 3 Bh7+ Kh8[] 4 Ng6mate; 2…Kh6?? 3 Rh7 mate) 3 Rf8+ Kg7[] 4 Rf7+=

Having established that 1 Qf8+ draws it is necessary to look at 1 Qf7+: but it can be quickly seen that it is inferior (losing) since after 1…Rf7 2 Rf7+, black still has his Bd6, protecting and not on f8.

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