Big Pawn: 24...Ba7 - black steps all over his own feet in a few more moves and the bishop doesnít seem to belong here.
24...Be7 gets it out of the way.
This is like the Nimzovich idea of restraining these pawns. Now white canít play 25. b4 with tempo and his a4 pawn would hang. So if White wants to mobilize this pawn phalanx heíd need to play, perhaps,
Then with the a4 pawn covered, white threatens b4. Black would like to play ...d4 to undermine the b4 square and further restrain whites pawn phalanx but d4 is solidly covered. In the French Black often plays ...g5, ...g4 to drive the Knight away from the center and then follow up with ...d4 or ...f6. So,
25...g5 and if
26. b4 then ...Ra8
avoiding the fork, and now whiteís b4 pawn may be weak if black gets ...d4 in. How does white defend against ...g4? How does white maintain mobility in his phalanx?
If 27. h3 then Ng6 increases the pressure strongly with ...f6 and ...Bxf6 to follow, easily winning.
27. a5 then ...g4
28. Nd2 d4
Now there appears to be no way for White to shore up his once dangerous and threatening pawn phalanx.