Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Zukertort_Variation
Moves: 1. d4 d5 2. Nf3 e6 3. Bf4 c5 4. e3 c4 5. c3 b5 6. Nbd2 Bb7 7. b3 a6 8. Be2 Bd6
9. Bg3 f5 10. Ne5 Nf6 11. Ndf3 Nbd7 12. O-O Nxe5 *
Position (FEN): r2qk2r/1b4pp/p2bpn2/1p1pnp2/2pP4/1PP1PNB1/P3BPPP/R2Q1RK1 w kq - 0 13
White to move.
Themes:  Middlegame  
Puzzle rating: 1238
Best move: dxe5