Chess puzzle (Advantage)
Opening: Grunfeld_Defense, Grunfeld_Defense_Three_Knights_Variation
Moves: 1. d4 Nf6 2. c4 d5 3. Nc3 g6 4. Nf3 Bg7 5. Bg5 dxc4 6. e4 Bg4 7. e5 Nd5 8. Bxc4
Nxc3 9. bxc3 O-O 10. h3 Bf5 11. O-O Kh8 12. Qb3 f6 13. exf6 exf6 14. Bf4 c6 15.
Qxb7 Nd7 16. Qxc6 Rc8 17. Qa4 *
Position (FEN): 2rq1r1k/p2n2bp/5pp1/5b2/Q1BP1B2/2P2N1P/P4PP1/R4RK1 b - - 2 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 1348
Best move: Nb6