Chess puzzle (Equality)
Moves: 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Qb6 5. a3 c4 6. Nf3 Nc6 7. Nbd2 Na5 8. b4 cxb3
9. Rb1 Bd7 10. Nxb3 Ba4 11. Nfd2 Nc4 12. Qf3 Bxa3 13. Bxa3 *
Position (FEN): r3k1nr/pp3ppp/1q2p3/3pP3/b1nP4/BNP2Q2/3N1PPP/1R2KB1R b Kkq - 0 13
Black to move.
Themes:  Middlegame  
Puzzle rating: 1524
Best move: Nxa3