Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Steinitz_Countergambit
Moves: 1. d4 d5 2. Bf4 c5 3. c3 Nc6 4. Nf3 Nf6 5. e3 Bg4 6. h3 Bxf3 7. Qxf3 cxd4 8.
Bb5 Rc8 9. Bxc6+ Rxc6 10. O-O Qb6 11. Qe2 e6 12. Be5 dxc3 13. Nxc3 Be7 14. Bd4
Bc5 *
Position (FEN): 4k2r/pp3ppp/1qr1pn2/2bp4/3B4/2N1P2P/PP2QPP1/R4RK1 w k - 3 15
White to move.
Themes:  Middlegame  
Puzzle rating: 1511
Best move: Na4