Cordingley puzzle 10

Black to play and win

Solution

I found this one fairly straightforward, though a big computational effort, with two lines to look at. The low risk one, because little is staked, is 1…Bf2+ (virtually a forced move- what else could black do than play this move, and hope his attack wins) 2 Kf2 Qh2+, when 3 Ke1 Nc5 doesn't require much calculation. A great deal more risky is 2 Kg2 Qh3+, a fairly obvious sacrifice of the queen, drawing the king into the line of fire. After 3 Kh3 (3 Nf3 Nd4+) Nf4+ 4 Kh4 I think 4…Ng6+ is obviously good enough (my iPad engine Stockfish rates it at +7) whilst in fact 4…Ng2+ is even stronger.

Not a hard puzzle, but a good test of longish calculation, though judgement dispenses with the need for much effort.

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