Chess puzzle (Advantage)
Opening: Nimzowitsch_Defense, Nimzowitsch_Defense_French_Connection
Moves: 1. e4 e6 2. Nc3 Nc6 3. Nf3 Bb4 4. Bc4 Nf6 5. O-O Bxc3 6. bxc3 Nxe4 7. Qe2 Nf6
8. d4 O-O 9. Bg5 a6 10. Ne5 h6 11. Bh4 g5 12. Bg3 Na5 *
Position (FEN): r1bq1rk1/1ppp1p2/p3pn1p/n3N1p1/2BP4/2P3B1/P1P1QPPP/R4RK1 w - - 2 13
White to move.
Themes:  Middlegame  
Puzzle rating: 2122
Best move: Bd3