Chess puzzle (Checkmate)
Opening: Alekhine_Defense, Alekhine_Defense_OSullivan_Gambit
Moves: 1. e4 Nf6 2. e5 Nd5 3. d4 b5 4. Bxb5 c5 5. c4 cxd4 6. cxd5 Qa5+ 7. Qd2 Qxb5 8.
Qxd4 Ba6 9. Nd2 d6 10. a4 Qd3 11. Ngf3 *
Position (FEN): rn2kb1r/p3pppp/b2p4/3PP3/P2Q4/3q1N2/1P1N1PPP/R1B1K2R b KQkq - 2 11
Black to move.
Themes:  Opening Mate in 1 
Puzzle rating: 755
Best move: Qe2#