Another pawn endgame

I had another pawn endgame on FICS 5+0 blitz today that I figured I'd post. It was riddled with mistakes. I'd like help analyzing it. The ratings are FICS blitz ratings. EDIT: Oh, I also missed 48. Kf3 a5 Kg4 Kf6 b3, losing a tempo.

43.g5 is totally crushing. Wins pretty much instantly due to the fact you will get a passed pawn there immediately. That said, what you played also wins too.

46.Ke5 was not good... 46.Ke4 and you go Ke4-f3-g4 and take the g5 pawn. Black can guard it by playing his king to f6 after you arrive on g4, but then you have b4! and he's forced to drop the pawn, losing.

Generally speaking I have no idea why you sacrificed the pawn... it was totally pointless and keeping the pawn would have ensured an easy win.

I agree completely with 43. g5, and I wish I had taken the time to calculate it.

About 46. Ke4... I missed that completely. I was too focused on breaking in on the side of the pawn my King was on. Chalk yet another mistake up on the list...

The reason I sacrificed the pawn is that I couldn't see any way to break through otherwise. Now, of course, with plenty of time I see Ke4, Kf4, and g5 with no problem. Thanks for pointing that out.

When in doubt, sacrificing isn't the way to go. At least mill around with your king and you'll probably hit on an idea in that position...