Chess puzzle (Equality)
Moves: 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. e3 Be7 5. Nf3 O-O 6. cxd5 exd5 7. Bd3 c6 8. h3
Bb4 9. Qb3 Ba5 10. Bd2 h6 11. O-O Be6 12. Qxb7 Nbd7 13. Qxc6 Rb8 14. Nb5 Bxd2
15. Nxd2 Nb6 16. Nxa7 Bd7 17. Qc3 *
Position (FEN): 1r1q1rk1/N2b1pp1/1n3n1p/3p4/3P4/2QBP2P/PP1N1PP1/R4RK1 b - - 2 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 1867
Best move: Na4