Chess puzzle (Advantage)
Opening: Alekhine_Defense, Alekhine_Defense_Balogh_Variation
Moves: 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Bc4 Nb6 5. Bb3 d5 6. Qf3 Nc6 7. Ne2 a5 8. Nbc3
a4 9. Nxd5 *
Position (FEN): r1bqkb1r/1pp1pppp/1nn5/3NP3/p2P4/1B3Q2/PPP1NPPP/R1B1K2R b KQkq - 0 9
Black to move.
Themes:  Opening  
Puzzle rating: 1704
Best move: axb3