Chess puzzle (Advantage)
Moves: 1. e4 e6 2. d3 d5 3. Nd2 dxe4 4. dxe4 Nf6 5. Ngf3 Bb4 6. c3 Bc5 7. Bb5+ c6 8.
Bc4 Qb6 9. O-O Ng4 10. Qe2 O-O 11. h3 Nf6 12. a4 a5 13. e5 Nd5 14. Ne4 Be7 15.
b3 Nd7 16. h4 Qc7 17. Bxd5 cxd5 18. Neg5 Qxc3 19. Bb2 Qxb3 20. Rfb1 b6 *
Position (FEN): r1b2rk1/3nbppp/1p2p3/p2pP1N1/P6P/1q3N2/1B2QPP1/RR4K1 w - - 0 21
White to move.
Themes:  Middlegame  
Puzzle rating: 1972
Best move: Ba3