Chess puzzle (Advantage)
Opening: Caro-Kann_Defense, Caro-Kann_Defense_Advance_Variation
Moves: 1. e4 c6 2. Nf3 d5 3. e5 Bf5 4. d4 e6 5. Nc3 Nd7 6. h3 Ne7 7. Nh4 Bg6 8. Nxg6
hxg6 9. Bf4 c5 10. Be3 Nc6 11. Bb5 Qb6 12. dxc5 Bxc5 13. Bxc5 Qxc5 14. Bxc6
Qxc6 15. Qe2 O-O 16. O-O-O a5 17. a3 Rfb8 18. f4 *
Position (FEN): rr4k1/1p1n1pp1/2q1p1p1/p2pP3/5P2/P1N4P/1PP1Q1P1/2KR3R b - - 0 18
Black to move.
Themes: Defensive Move Middlegame  
Puzzle rating: 1672
Best move: b5