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The Pawn formation tells me that White is primed for a Kingside attack. White's DSB is on a nice diagonal, his LSB is on a closed but still nice diagonal and has e2 as a nice spot to reposition, the Queen can get to f3 or g3, the e2 Rook might go to g1 or h1, the a2 Rook can glide over to g2 or h2 if only that g2 Pawn was out of the way. Putting that all together, of course then, g4 is the lever in the position to get things rolling. Let's see how that turns out:

27. Be2, right on plan. 29. g4, right on cue. 30. Raa1 And I missed it completely. This is why I'm a patzer and Bronstein is Bronstein. White had to have seen b4 and an eventual Qa2 for that move to make sense. I am reminded of Nimzo's maxim "We engage one wing, or the obvious weakness in it, and thus draw the other enemy wing out of its reserve, when new weakness will be created on that reserve wing, and so the signal is given for systematic manoeuvring against two weaknesses." White's space advantage is demonstrated to great effect.

After 42 moves, here's the position:

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Now the White Queen has intruded on the a file, the Rooks stand shoulder to shoulder on the a and b files, the DSB bears down on the weakened c Pawn, and the Queen side attack is on in earnest.

After 59 moves:

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The difference is Bronstein never became king although he came really close.

Remarkable game with a good review by <OhioChessFan>. There was a recent discussion about what a closed game is, now <that> one qualifies. The lesson is in that kind of game, if just one of your pieces is stuck, it's a recipe for failure: here Black's DSB stuck on g7 was unable to defend defend the Qside Pawns and the e7 Pawn was more than a dead weight blocked by the d5-f5 bind: it was preventing the coordination of Black's pieces.

Lesson#25: even in a closed game, keep your pieces mobile behind the trenches.