Chess puzzle (Advantage)
Opening: Pirc_Defense, Pirc_Defense_Other_variations
Moves: 1. e4 d6 2. d4 c6 3. Nf3 Nd7 4. Nc3 h6 5. Bd3 g5 6. Be3 Bg7 7. Qd2 Ngf6 8. h3
g4 9. hxg4 Nxg4 10. O-O-O Nxe3 11. Qxe3 Nf6 12. Kb1 Ng4 13. Qe2 Qb6 14. e5 dxe5
15. dxe5 Nxf2 *
Position (FEN): r1b1k2r/pp2ppb1/1qp4p/4P3/8/2NB1N2/PPP1QnP1/1K1R3R w kq - 0 16
White to move.
Themes:  Middlegame  
Puzzle rating: 1558
Best move: Na4