What would have happened different if 40.e5?

Something like this probably:

|40.e5 41.g8 42.e13 43.c12 44.f11 45.d11 46.h8 47.i9 48.j9 49.j11
or
|40.e5 41.g8 42.e13 43.c12 44.f11 45.d11 46.h8 47.i9 48.i12 49.h7

40.e5 41.g8 42.f13?

Maybe, I cannot see the point.

|40.e5 41.g8 42.f13 43.c12

Just picking the brain of a player way better than I am :-) I followed the whole match and understood the action until 40.f3 I can see better now what black was concerned about when he moved there.

I think spd just tried f3 cause of this:

|41.d7 42.c4 43.c5 44.d2 45.b3 46.b2
|41.d7 42.c4 43.f4 44.g5 45.b4 46.d6 47.c6 48.b7
|41.d7 42.c4 43.e5 44.d2 45.g4 46.h4

If I played very fast (being too confident) I could miss this.

By the way, when I saw f3, I directly told to myself "I am 100% sure that d7 fails" :P

Florian is right about my f3 move. but i am almost sure that |38.k12 would have been winning move for black. that was my bad. btw it was very good match.

And if black played 38.e13?

As for 41.d7 42.c4 43.f6 44.g5 45.b4

41. d7 42. c4 43. f6 44. h4 seems to win, @the above.

41.d7 42.c4 43.f6 44.h4 45.b4