Chess puzzle (Checkmate)
Moves: 1. e4 e6 2. d4 d5 3. e5 c5 4. dxc5 Bxc5 5. f4 Nc6 6. g3 Nge7 7. Nf3 Qb6 8. Qe2
Nf5 9. c3 a6 10. Bh3 Nfe7 11. b4 Nxb4 12. cxb4 Bxb4+ 13. Bd2 a5 14. a3 Bxd2+
15. Nbxd2 Bd7 16. Bf1 Rc8 17. Rb1 Qa7 18. Qd3 O-O 19. Ng5 g6 20. g4 d4 21. Bg2
Rc3 22. Qf1 Re3+ 23. Kd1 Ba4+ 24. Kc1 Rc8+ 25. Kb2 Rcc3 26. Nge4 Qb6+ 27. Ka1 *
Position (FEN): 6k1/1p2np1p/1q2p1p1/p3P3/b2pNPP1/P1r1r3/3N2BP/KR3Q1R b - - 13 27
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 897
Best move: Rxa3#