Test your chess: daily chess puzzle # 186

Black to play and win

J Geyser v RS Hansen 1974

Solution

Not too hard today, because the obvious 1…Nc3+ wins (Stockfish has it at -7) but the alternative move order 1..g4 is clearly better. Stockfish spoils the fun by initially evaluating it as -150 before, after half a minute or so, switching to mate in 11. But all a human needs to see is 2 Bg4 Nc3+ and either the queen is lost or Qg4+ follows, ruinously.

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