Chess puzzle (Advantage)
Opening: French_Defense, French_Defense_La_Bourdonnais_Variation
Moves: 1. e4 e6 2. f4 d5 3. Bd3 c5 4. c4 Nc6 5. cxd5 exd5 6. e5 c4 7. Be2 Bc5 8. Nf3
Bf5 9. d4 cxd3 10. Bxd3 Bg4 11. Nc3 Nd4 12. Be2 Bxf3 13. Bxf3 Ne7 14. Na4 Qa5+
15. Nc3 Nef5 16. Bd2 Qb6 17. Na4 Qb5 18. Nxc5 Qxc5 19. Qa4+ *
Position (FEN): r3k2r/pp3ppp/8/2qpPn2/Q2n1P2/5B2/PP1B2PP/R3K2R b KQkq - 1 19
Black to move.
Themes: Defensive Move Middlegame  
Puzzle rating: 1086
Best move: b5