Chess puzzle (Advantage)
Opening: French_Defense, French_Defense_Classical_Variation
Moves: 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. a3 c5 6. Be3 Qb6 7. b4 cxb4 8. axb4
Bxb4 9. Ne2 Qc7 10. Bd2 a5 *
Position (FEN): rnb1k2r/1pqn1ppp/4p3/p2pP3/1b1P4/2N5/2PBNPPP/R2QKB1R w KQkq - 0 11
White to move.
Themes:  Opening  
Puzzle rating: 1013
Best move: Nb5