Chess puzzle (Advantage)
Opening: Modern_Defense, Modern_Defense_Other_variations
Moves: 1. d4 g6 2. e3 Bg7 3. Bd3 e6 4. f4 f5 5. Nf3 d5 6. O-O Nc6 7. c3 Nge7 8. Nbd2
a6 9. Ne5 Nxe5 10. fxe5 b5 11. b3 c6 12. a4 Bb7 13. axb5 axb5 14. Rxa8 Qxa8 15.
Nb1 Qa1 16. Ba3 Nc8 17. Qc2 Nb6 18. Bc5 Nd7 *
Position (FEN): 4k2r/1b1n2bp/2p1p1p1/1pBpPp2/3P4/1PPBP3/2Q3PP/qN3RK1 w k - 8 19
White to move.
Themes:  Middlegame  
Puzzle rating: 1455
Best move: Na3