I thought those moves were both very strong stratigically and lead to a win in a drawn position...thoughts? Where they !
The Pawn is Mightier than the Sword

30. a5! was a brilliant idea, intending to play 31. a6, completely undermining the pawn chain. When you played 32. a6, I had a warm feeling going through the finish watching the two passers race to the goal.
Great tactics in a seemingly inferior endgame :)
I played these two pawn sacrifices in the endgame just on pure gut feeling they were correct. Hope you enjoy them.