Chess puzzle (Advantage)
Opening: Richter-Veresov_Attack, Richter-Veresov_Attack_Other_variations
Moves: 1. Nc3 d5 2. d4 Nf6 3. Bg5 c6 4. h3 Qa5 5. f3 Nh5 6. Bh4 Nd7 7. e3 e5 8. g4
Nhf6 9. Qd2 exd4 10. exd4 Be7 11. Bg3 O-O 12. O-O-O Bb4 13. Kb1 Nb6 14. Bd3 Na4
15. Nge2 Re8 16. Be1 Ba3 *
Position (FEN): r1b1r1k1/pp3ppp/2p2n2/q2p4/n2P2P1/b1NB1P1P/PPPQN3/1K1RB2R w - - 13 17
White to move.
Themes:  Middlegame  
Puzzle rating: 1551
Best move: Nxa4