Chess puzzle (Advantage)
Opening: Nimzowitsch_Defense, Nimzowitsch_Defense_Colorado_Countergambit
Moves: 1. e4 Nc6 2. Nf3 f5 3. d3 fxe4 4. dxe4 e5 5. Nc3 Nf6 6. Bg5 Bb4 7. Bb5 h6 8.
Bxf6 Qxf6 9. O-O d6 *
Position (FEN): r1b1k2r/ppp3p1/2np1q1p/1B2p3/1b2P3/2N2N2/PPP2PPP/R2Q1RK1 w kq - 0 10
White to move.
Themes:  Opening  
Puzzle rating: 1725
Best move: Nd5