Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Hyperaccelerated_Pterodactyl
Moves: 1. Nf3 g6 2. e4 Bg7 3. d4 c5 4. d5 d6 5. c4 Nf6 6. Nc3 a6 7. Bd3 O-O 8. O-O b5
9. cxb5 axb5 10. Nxb5 Ba6 11. Nc3 Bxd3 12. Qxd3 Nbd7 13. Bf4 Qb6 14. b3 Qb4 15.
Na4 Nh5 16. Bd2 Qa3 17. Bc3 *
Position (FEN): r4rk1/3nppbp/3p2p1/2pP3n/N3P3/qPBQ1N2/P4PPP/R4RK1 b - - 6 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 2148
Best move: Rxa4