Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Classical_Variation
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. c3 a6 5. Ba4 Nge7 6. d4 exd4 7. cxd4 Bb4+ 8.
Nc3 b5 9. Bb3 O-O 10. Bf4 a5 11. a3 a4 *
Position (FEN): r1bq1rk1/2ppnppp/2n5/1p6/pb1PPB2/PBN2N2/1P3PPP/R2QK2R w KQ - 0 12
White to move.
Themes:  Opening  
Puzzle rating: 1722
Best move: axb4