Chess puzzle (Advantage)
Opening: Modern_Defense, Modern_Defense_Other_variations
Moves: 1. e4 g6 2. Nf3 Bg7 3. Bc4 d6 4. d3 Nh6 5. c3 O-O 6. Be3 Nc6 7. Qc1 Ng4 8. Bd2
Na5 9. Bb3 Kh8 10. Bd1 f5 11. b4 fxe4 12. bxa5 *
Position (FEN): r1bq1r1k/ppp1p1bp/3p2p1/P7/4p1n1/2PP1N2/P2B1PPP/RNQBK2R b KQ - 0 12
Black to move.
Themes:  Opening  
Puzzle rating: 1066
Best move: exf3