Test your chess: Reitstein problem 123

White to play and win

RT Spencer v BP Donnelly 1967

Solution

Straightforward, but strange: Reitstein only gives the move played in the game, 1 Nd6!, which wins (though black can struggle on with 1…cd 2 Nf7 Rf7, but of course it is 1-0. However, 1 Nef6+! is even stronger, with no real bale out, and, being a check, is more forceful. Stockfish gives Nd6 as +9, Nf6+ as +100, whatever that means.

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