Chess puzzle (Advantage)
Opening: Old_Indian_Defense, Old_Indian_Defense_Other_variations
Moves: 1. d4 Nf6 2. c4 d6 3. Nc3 Nbd7 4. Nf3 c6 5. e3 Qc7 6. Bd3 e5 7. O-O Be7 8. Re1
O-O 9. Qc2 a6 10. b3 d5 11. cxd5 cxd5 12. dxe5 Nxe5 13. Nxe5 Qxe5 14. Bb2 Qg5
15. Ne2 h5 16. Nd4 Bh3 *
Position (FEN): r4rk1/1p2bpp1/p4n2/3p2qp/3N4/1P1BP2b/PBQ2PPP/R3R1K1 w - - 2 17
White to move.
Themes:  Middlegame  
Puzzle rating: 2136
Best move: f4