Chess puzzle (Advantage)
Opening: Modern_Defense, Modern_Defense_Semi-Averbakh_Variation
Moves: 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. c4 Qb6 5. Nc3 cxd4 6. Nd5 Qa5+ 7. b4 Qd8 8.
Nxd4 Nc6 9. Bb2 e5 *
Position (FEN): r1bqk1nr/pp1p1pbp/2n3p1/3Np3/1PPNP3/8/PB3PPP/R2QKB1R w KQkq - 0 10
White to move.
Themes:  Opening  
Puzzle rating: 1659
Best move: Nb5