H3 was really bad, spoiling an otherwise great game. Of course the only way to continue that battle was |30.j5 and I suppose the best continuation is 31.j3 32.k7 33.h7 and white has a nasty threat of L7, so I guess 34.l9 is best, and then the battle continues on the left side.

Oh, yeah: |32.q3 loses to 33.l2

I studied so many variations before playing 29.i5, the best way for me was:

|30.j5 31.g6 32.i7 33.h11 34.k8 35.k14 36.g8 37.f8 38.d11 39.d9 40.m14

And now I have to play something around 41.f18, I tried a lot of moves, i won't give the variations there but I could not find a winning one for me cause of d11.
Is is why I tried a lot of variations before playing 29.i5 cause i wanted a variation where I can play h11 (forcing k8) and where it is not possible to obtain a black pawn in d11 but I think this is just not possible.

For instance:
|29.f5 30.h7
|29.f6 30.h7 31.h11 32.g4 33.g5 34.e5 35.h3 36.g6 37.i6 38.j6
does not worked

By the way, I also thought it was possible that David plays h3 instead of j5 if he was tired when he played but I really wanted to continue this battle and find a way on the bottom, I was not resigned and i wanted to find something.