Is this sac sound?
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Make a "begin" of the diagram just before the sac you were talking about.
I thought you were referring to a knight sacrifice, later I noticed that you mention pawn sacrifice.
I'm voting yes.. Defending the pawn loses time on the attack.. Rb6 seems better to me though..After rb6 the pawn now seems safe... but even if it wasnt..., the rook has a great chance to move down to b2 and park there for a while....
43.Kf3
or
Oh, and the guy previous to me seems wrong... Why not 18.... qe5+ FTW.
The knight sac seems pretty sound. I don't know if 10 Kf2 works, since then 10...Bc5+ 11 Kg3 follows. Then Black can play something like 11...Qxf6 and have a big attack. I don't know if there's a forced win, however.
It seems that both players started to drift a little after that. Black doesn't trade queens, which forces him to give back the exchange. And then comes a series of pointless moves. I think the pawn sacrifice was also pretty good, although I don't think White defended very well.
Looks sound to me. That's what he gets for not castling.