Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 h6 4. Nc3 Nf6 5. b3 Bb4 6. Bb2 Bxc3 7. Bxc3 d6 8. d3
Bg4 9. h3 Bh5 10. g4 Bg6 11. Nh4 Bh7 12. Nf5 Bxf5 13. gxf5 d5 14. exd5 Nxd5 15.
Bxd5 Qxd5 16. Rg1 Rg8 17. Qd2 O-O-O 18. O-O-O Nd4 19. Bxd4 Qxd4 20. Rg4 *
Position (FEN): 2kr2r1/ppp2pp1/7p/4pP2/3q2R1/1P1P3P/P1PQ1P2/2KR4 b - - 1 20
Black to move.
Themes:  Endgame Mate in 1 
Puzzle rating: 947
Best move: Qa1#