Black to play
Once again, going through the main motifs/candidate moves + a bit of calculation are necessary here ( no opening book or ending manual is needed; Chess engines will find the right move instantly)...
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The White player ( a GM) just played Qc6. Can you figure out why Black ( also a GM ) was pleased to play on ?
Solution/Hint:
in the comments, one guest (gaffeur) found the right idea !
1..Rh2+ 2 Kg3 f1=N+ ! 3 Kf4 Rh4+ 4 Kg5 ( and 2 Kg1?? Bh3 #), reaching this diagram
Follow-up , Black to win :
What is the neat finish ?