Chess puzzle (Checkmate)
Opening: Benoni_Defense, Benoni_Defense_Benoni_Gambit_Accepted
Moves: 1. d4 c5 2. dxc5 Nc6 3. a3 Qa5+ 4. Nc3 Qxc5 5. Nf3 d6 6. Be3 Qa5 7. Qd5 Bf5 8.
Qxa5 Nxa5 9. O-O-O b6 10. Nd5 Rc8 11. c3 *
Position (FEN): 2r1kbnr/p3pppp/1p1p4/n2N1b2/8/P1P1BN2/1P2PPPP/2KR1B1R b k - 0 11
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1118
Best move: Nb3#