Cordingley puzzle 41

Black to play and win

Solution

I thought this was straightforward. A quick calculation of the obvious check 1…Qc6+, shows it is insufficient. The second line I looked at was the solution, an initial decoding check, 1…Na2+. If white doesn't take, then either 2 Kd2 Rb2+ or 2 Kd1 Bf3+; and after 2 Ba2, Qc6+ comes with renewed force, now that the queen can come into c2. Not much more needs to be calculated.

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