Chess puzzle (Advantage)
Opening: English_Opening, English_Opening_Symmetrical_Variation
Moves: 1. Nf3 c5 2. c4 g6 3. g3 Bg7 4. Bg2 Nc6 5. O-O d5 6. cxd5 Qxd5 7. Nc3 Qh5 8. a3
Bh3 9. Rb1 Nf6 10. b4 Bxg2 11. Kxg2 Rd8 12. bxc5 Qxc5 13. Rxb7 O-O 14. Na4 Qa5
15. Bb2 Qa6 16. Qb3 *
Position (FEN): 3r1rk1/pR2ppbp/q1n2np1/8/N7/PQ3NP1/1B1PPPKP/5R2 b - - 6 16
Black to move.
Themes:  Middlegame  
Puzzle rating: 1807
Best move: Na5