Black to play and win
Reitstein says that on this correspondence game black announced a mate in 9 (with the rider that there were ways white could throw ruinous material away to drag the game on). It is actually quite a nice exercise to find the main lines.
GW McElhinny v J Martins 1957
The first moves are obvious: 1…Rh2+ 2 Kg1 (2 Kg1 Qh3 is trivial) Qg3+
White has two moves now.
I found a very pretty mate here, and was pleased I could see such a long line. (Alas, Stockfish prefers a different move, but confirms mine line wins)
3…Nd3+ 4 Ke2 Rf2+ 5 Kd1 Nb2+ 6 Kc1 Qc3+ 7 Kb1
Here, I saw ( from the original position, quite hard, but white’s moves are forced, so it is a single branch) 7…Qd3+! 8 Qd3 (8 Kc1 holds out longer, but the same thing happens: 8…Qc4+!…
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