Chess puzzle (Advantage)
Moves: 1. c4 Nf6 2. Nc3 g6 3. e4 d6 4. d4 Bg7 5. Nf3 O-O 6. Be2 e5 7. d5 a5 8. O-O Na6
9. h3 Nh5 10. Bd2 Nf4 11. Rc1 Nc5 12. Qc2 f5 13. Bxf4 exf4 14. Nd2 fxe4 15.
Ncxe4 Bf5 16. Bd3 Nxd3 17. Qxd3 b6 18. b3 Qd7 19. Rce1 Rae8 20. f3 Re7 21. Re2
Rfe8 22. Rfe1 h6 23. Kf1 Kf7 24. a3 Bb2 25. a4 Re5 *
Position (FEN): 4r3/2pq1k2/1p1p2pp/p2Prb2/P1P1Np2/1P1Q1P1P/1b1NR1P1/4RK2 w - - 1 26
White to move.
Themes: Defensive Move, Trapped Piece Middlegame  
Puzzle rating: 2071
Best move: Nb1