Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Chigorin_Variation
Moves: 1. d4 d5 2. Nf3 Nc6 3. c4 e6 4. Nc3 Bb4 5. a3 Bxc3+ 6. bxc3 dxc4 7. e4 b5 8. a4
b4 9. cxb4 Nxb4 10. Bxc4 Nf6 11. e5 Nfd5 12. Ba3 a5 13. Bxd5 Qxd5 14. O-O O-O
15. Qd2 c5 16. Bxb4 *
Position (FEN): r1b2rk1/5ppp/4p3/p1pqP3/PB1P4/5N2/3Q1PPP/R4RK1 b - - 0 16
Black to move.
Themes:  Middlegame  
Puzzle rating: 1434
Best move: cxb4