Chess puzzle (Advantage)
Opening: Sicilian_Defense, Sicilian_Defense_Hyperaccelerated_Fianchetto
Moves: 1. e4 c5 2. Nf3 g6 3. d4 cxd4 4. Qxd4 Nf6 5. e5 Nc6 6. Qa4 Nd5 7. Qe4 e6 8. c4
Nb6 9. Nc3 Bg7 10. c5 Nd5 11. Nxd5 exd5 12. Qxd5 O-O 13. Bb5 *
Position (FEN): r1bq1rk1/pp1p1pbp/2n3p1/1BPQP3/8/5N2/PP3PPP/R1B1K2R b KQ - 2 13
Black to move.
Themes:  Opening  
Puzzle rating: 1145
Best move: Qa5+