Never the one to shy away from a possibly unsound sack I recently had a game where I could away my knight for two pawns, a very annoying knight pin and my opponents king stuck in the center.
What I thought was:
1 - If he gives back my knight I'll end up with two connected passed pawns
2 - If he doesn't give my knight back I'll have a pin and his king stuck in the center with plenty of attacking chances.
Later on my opponent made a move that surprised me (after my 18. g3 which maybe was a lost of tempo but I was thinking on placing my bishop on f4): 18. ... Ra8?!. After that move I saw a promising queen sac and just had to go for it.
After 20. Nxe7+ black should have played 20. ... Kd8 but from what I can see I still end up a pawn ahead with the bonus of having two connected passed pawns on the queen side.
Anyway here it is: