Chess puzzle (Advantage)
Opening: Alekhine_Defense, Alekhine_Defense_Two_Pawn_Attack
Moves: 1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. c5 Nd5 5. Bc4 e6 6. d4 a6 7. Nf3 Nc6 8. O-O b5
9. Bb3 Be7 10. Nc3 Na5 11. Bc2 Nxc3 12. bxc3 Nc4 13. a4 Bb7 14. Rb1 d6 15. axb5
axb5 16. Rxb5 Ba6 17. Ra5 *
Position (FEN): r2qk2r/2p1bppp/b2pp3/R1P1P3/2nP4/2P2N2/2B2PPP/2BQ1RK1 b kq - 2 17
Black to move.
Themes: Hanging Piece Opening  
Puzzle rating: 934
Best move: Nxa5