Chess puzzle (Advantage)
Opening: Polish_Opening, Polish_Opening_Czech_Defense
Moves: 1. b4 e5 2. Bb2 d6 3. Nf3 Nf6 4. e3 Be7 5. c4 Be6 6. Be2 Nbd7 7. O-O O-O 8. d4
exd4 9. Nxd4 Nb6 10. Qc2 Qd7 11. b5 a6 12. a4 axb5 13. axb5 Rxa1 14. Bxa1 Ra8
15. Nc3 Nxc4 16. Na4 Na5 17. Bf3 Bb3 *
Position (FEN): r5k1/1ppqbppp/3p1n2/nP6/N2N4/1b2PB2/2Q2PPP/B4RK1 w - - 4 18
White to move.
Themes:  Middlegame  
Puzzle rating: 1249
Best move: Nxb3