Chess puzzle (Advantage)
Opening: Nimzowitsch_Defense, Nimzowitsch_Defense_Declined_Variation
Moves: 1. e4 Nc6 2. Nf3 d5 3. exd5 Qxd5 4. Nc3 Qh5 5. Bb5 Bg4 6. Bxc6+ bxc6 7. d3 Nf6
8. Bf4 O-O-O 9. Qe2 e5 10. Bg3 Bb4 11. O-O Bxc3 12. bxc3 e4 *
Position (FEN): 2kr3r/p1p2ppp/2p2n2/7q/4p1b1/2PP1NB1/P1P1QPPP/R4RK1 w - - 0 13
White to move.
Themes:  Middlegame  
Puzzle rating: 1241
Best move: dxe4