Chess puzzle (Advantage)
Opening: Ruy_Lopez, Ruy_Lopez_Steinitz_Defense
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. Bxc6+ bxc6 5. h3 h5 6. c4 Be7 7. O-O d5 8. Qe2
Bc5 9. Nxe5 Nf6 10. Nxc6 Qd6 11. cxd5 O-O 12. e5 Qxd5 13. Nxa7 *
Position (FEN): r1b2rk1/N1p2pp1/5n2/2bqP2p/8/7P/PP1PQPP1/RNB2RK1 b - - 0 13
Black to move.
Themes: Defensive Move Opening  
Puzzle rating: 1801
Best move: Bb7