Black to win : Tactics

a neat tactical position illustrating the bishop pair strength.
Black to play and win

Solution here --------- http://view.chessbase.com/cbreader/2018/5/7/Game169100203.html

Tactical Motif VI : Attacking the King

Roughly 50% of all combinations are centered around attacking the king. Besides topical checkmates( Smothered,Boden,etc), there are numerous themes involving the king hunt.
Here we present examples where the bishop pair is instrumental in the attack.

King attack: Illustration

15.? White to play and win ( Lasker-Bauer 1889)
















This famous combination by Lasker , with a now thematic double bishop sacrifices,started with:

15.Bxh7+! Kxh7 16.Qxh5+ Kg8 17.Bxg7! ( Second bishop sacrifice, opening the king) Kxg7 18.Qg4+! Kh7 19.Rf3 e5 (only defense against Rh3) 20.Rh3+ Qh6 21.Rxh6+ Kxh6 22.Qd7! 1-0

Exercises (difficult level):
I Black to play and win (Rotlewi-Rubinstein 1907)

II: Black to play and win (Spassky-Tal, 1973)