Chess puzzle (Crushing)
Opening: Blackmar-Diemer_Gambit, Blackmar-Diemer_Gambit_Ryder_Gambit
Moves: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Qxf3 e6 6. Nge2 Bb4 7. Bd2 O-O 8.
O-O-O Nc6 9. Be3 Qe7 10. Nb5 a6 11. Nbc3 Rd8 12. Qg3 b6 13. a3 Bxa3 14. bxa3
Qxa3+ 15. Kb1 Nd5 16. Nxd5 Rxd5 17. Bf4 *
Position (FEN): r1b3k1/2p2ppp/ppn1p3/3r4/3P1B2/q5Q1/2P1N1PP/1K1R1B1R b - - 1 17
Black to move.
Themes:  Middlegame  
Puzzle rating: 1139
Best move: Rb5+