Chess puzzle (Advantage)
Opening: Pirc_Defense, Pirc_Defense_Other_variations
Moves: 1. e4 d6 2. Nf3 Nf6 3. Nc3 e5 4. Bc4 h6 5. O-O Be7 6. d3 c6 7. Bb3 Nbd7 8. h3
g5 9. Ne2 Nf8 10. c3 Ng6 11. d4 Qc7 12. Ng3 Nf4 13. Bxf4 *
Position (FEN): r1b1k2r/ppq1bp2/2pp1n1p/4p1p1/3PPB2/1BP2NNP/PP3PP1/R2Q1RK1 b kq - 0 13
Black to move.
Themes:  Middlegame  
Puzzle rating: 1447
Best move: gxf4