Runemaster: <paladin> You're right, but when I try to think of another move for White, it's not that easy. At first, I thought maybe 29.Ne4, but after 2 exchanges on e4, the c2 pawn falls.
Instead 29.Be3 b4 30.axb4 Qxb4 and the pressure on b2/c3 is uncomfortable.
When in doubt, do a knight manouvre, I always say. So maybe 29.Nd1 intending to work the knight to e5 via e3/f2 and g4, allowing c2-c3 at some stage.
29.Rd2 looks ugly, blocking in the c1 bishop, but the transparent discovery threat against the Black queen buys a tempo. Doubling the rooks on the 'd' file offers more than on the 'e' file, with the bishop retreating to f1 to bolster the g2 square.
All too slow, maybe, and not convincing anyway - perhaps that's why Korchnoi went for glory with 29.g4. Anyway, I guess I'm saying that under the surface White's position was already not that easy to play.