Find the best move with Black !

Black to play and take the advantage :19...?

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There is no straight win here, just a strong continuation made possible by a tactical motif

US Chess Championship 2010 : Nakamura-Shulman Tactics (round 9)

Black to play and win !

Nakamura-Shulman , (9) U.S Championship 2010; a brilliant tactical win for Black, issued from a french defense opening where Naka overpressed.

Shulman will play Kamsky tomorrow in the decisive game for the 2010 U.S Championship !

tactical conclusion

Black to play and conclude the attack

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 ?