Chess puzzle (Advantage)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Semi-Tarrasch_Defense
Moves: 1. d4 d5 2. Nf3 Nf6 3. c4 e6 4. Nc3 c5 5. dxc5 Bxc5 6. cxd5 Nxd5 7. Nxd5 Qxd5
8. Qxd5 exd5 9. Bf4 Nc6 10. a3 a5 11. e3 d4 12. Rc1 b6 *
Position (FEN): r1b1k2r/5ppp/1pn5/p1b5/3p1B2/P3PN2/1P3PPP/2R1KB1R w Kkq - 0 13
White to move.
Themes: Pin Middlegame  
Puzzle rating: 1517
Best move: Bb5