This is the checkmate I have always wanted to be able to give, and it was made slightly more complicated by the presence of the white queen. Just wanted to show it off really as its my first winning queen sac and a nice combo.
[Event "RHP Blitz rated"]
[Site "www.playtheimmortalgame.com"]
[Date "2009.8.18"]
[Round "?"]
[White "sunbunny21"]
[Black "mathmo"]
[Result "0-1"]
1. d2-d4 Ng8-f6 2. e2-e3 b7-b6 3. f2-f4 e7-e6 4. Ng1-f3 Bc8-b7 5. Bf1-d3 c7-c5 6. c2-c3 Bf8-e7 7. Nb1-d2 a7-a6 8. O-O b6-b5 9. Nf3-e5 c5-c4 10. Bd3-c2 d7-d6 11. Ne5-f3 Nb8-d7 12. Qd1-e2 e6-e5 13. e3-e4 e5xf4 14. d4-d5 O-O 15. b2-b3 c4xb3 16. Bc2xb3 Nd7-c5 17. Bb3-c2 Qd8-b6 18. Kg1-h1 Nf6-g4 19. Nd2-b3 Be7-h4 20. Bc1xf4 Nc5xe4 21. Nf3xh4 Ne4-f2 22. Kh1-g1 Nf2-h3 23. Kg1-h1 Qb6-g1 24. Rf1xg1 Ng4-f2 25. Qe2xf2 Nh3xf2 0-1
The possibility dawns at about move 17 when I start making some terrible moves chasing this pattern.
I think it *might* have been possible to almost force it with Bxd5 to open up the e file and Re1 to move the queen without leaving a choice of pieces en prise and hoping the knights werent captured.
Anyway :-D