Chess puzzle (Advantage)
Opening: English_Opening, English_Opening_Symmetrical_Variation
Moves: 1. Nf3 c5 2. c4 Nc6 3. Nc3 g6 4. b3 Bg7 5. Bb2 e6 6. e3 Nge7 7. Be2 O-O 8. O-O
d5 9. cxd5 exd5 10. d4 cxd4 11. Nxd4 Nxd4 12. exd4 Bd7 13. Bf3 Bc6 14. b4 a6
15. a4 Qb6 16. b5 axb5 17. axb5 Bxb5 *
Position (FEN): r4rk1/1p2npbp/1q4p1/1b1p4/3P4/2N2B2/1B3PPP/R2Q1RK1 w - - 0 18
White to move.
Themes:  Middlegame  
Puzzle rating: 2161
Best move: Qb3