Chess puzzle (Checkmate)
Opening: Blumenfeld_Countergambit, Blumenfeld_Countergambit_Other_variations
Moves: 1. d4 Nf6 2. c4 c5 3. Nf3 e6 4. Nc3 g6 5. e4 d6 6. Bg5 Bg7 7. e5 dxe5 8. dxe5
Qxd1+ 9. Rxd1 Nfd7 10. a3 Nxe5 *
Position (FEN): rnb1k2r/pp3pbp/4p1p1/2p1n1B1/2P5/P1N2N2/1P3PPP/3RKB1R w Kkq - 0 11
White to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1150
Best move: Rd8#