As always against Agrest I have seen myself end up in a bad position after the opening. White dominates the open file, black's rook can't move and my seventh rank is weak. White's play is probably to walk with the king to b2 and then open up the king side in one way or another.
26...h5!
gains space
27.Td2
Kh7
28.Kf2
Lf5!
the exchange will lead to pressure on the g-file and sufficient counterplay
29.e4
Le6
30.Ke2
g5!
against Agrest you have to achieve the pawn levers as soon as possible, otherwise you will find yourself in a positional lost position without counterplay. Here I open up in front of my king but it's important that I do this before white's king is away.
31.Kd1
gxh4
32.gxh4
Tg8
33.Kc1
Tg3
34.Kb2
Txf3
35.Td8
I have won a pawn but now I must defend in order to stop Tb8xb7.
35...Tg3
36.Tb8
Tg7
37.Dxa5
Dd6
[37...Tg8=
A rook exchange should have been good, then I always have perpetual when white starts advancing his majority.]
38.Dd8
Dxd8??
This is completely stupid and leading to a strategic loss. Here I must understand that a queen exchange is the last thing I want. There was many ways to avoid this and play for perpetual. [38...Ld7
39.Txb7
Dd4+
Draw.; 38...Dc5
39.Dxf6
Dd4+
Draw.; 38...Td7
39.Df8
Dd4+
Draw.]
39.Txd8
White wins with Td6, a5, Kc3, b4 etc. Black will ever achieve ...f5 and therefore he can just wait until the white majority decides. 1-0