Chess puzzle (Advantage)
Moves: 1. d4 e6 2. e4 c5 3. c3 cxd4 4. cxd4 d5 5. e5 Nc6 6. Nc3 a6 7. Nf3 Nge7 8. Be2
Ng6 9. O-O Be7 10. a3 O-O 11. Be3 b5 12. Qd2 Na5 13. Bd1 Nc4 14. Qe2 Bd7 15. b3
Nxa3 16. Qb2 b4 17. Na4 Bxa4 18. bxa4 a5 19. Bc2 Rc8 20. Bd3 Qb6 *
Position (FEN): 2r2rk1/4bppp/1q2p1n1/p2pP3/Pp1P4/n2BBN2/1Q3PPP/R4RK1 w - - 4 21
White to move.
Themes:  Middlegame  
Puzzle rating: 1481
Best move: Rxa3