Chess puzzle (Advantage)
Opening: English_Opening, English_Opening_Agincourt_Defense
Moves: 1. c4 e6 2. d4 Nc6 3. Nf3 g6 4. e4 Bg7 5. Be3 Nge7 6. Nc3 d5 7. e5 Nf5 8. a3
Nxe3 9. fxe3 O-O 10. Be2 f5 11. O-O h6 12. Qb3 a6 13. cxd5 exd5 14. Nxd5 Be6
15. Bc4 *
Position (FEN): r2q1rk1/1pp3b1/p1n1b1pp/3NPp2/2BP4/PQ2PN2/1P4PP/R4RK1 b - - 2 15
Black to move.
Themes:  Middlegame  
Puzzle rating: 1389
Best move: Na5