Promoting to a queen is no good, so we promote to a knight! The white forces are sufficient to cope with the lone black queen.

Both sides’ passed pawns are very far advanced, and each is a potential queen. Therefore, to gain a tempo, Black sacrifices a rook:

The armada of black pawns marches unstoppably to the promotion squares.

58.a7 d2 59.Rg1 c2 60.Rb8 c1=Q 61.a8=Q Qxg1+ 62.Kxg1 d1=Q+ 63.Kg2 Rc2+–+.

Careful! After 59...c2?, White manages to create threats against the black king: 60.Rf7+ Kh8 61.Rf6=. Black could also win with 59...d1=Q 60.Rxd1 c2–+.

White resigned, since after 61.Rxd1 c2, Black makes a queen with tempo. Incidentally, Black avoided a cunning trap: after 60...c2 61.R6g5, Black cannot avoid move repetition.

It is obvious that in the current pawn battle, White has the better chances. However, after an exchange of one pair of pawns on the queenside and the appearance there of the black knight, the win would be problematical. White’s solution is elegant and convincing:

The pawn on b6 is defended, the Rb7 passive, and the only other blockader of the white pawns is eliminated on g4. There is no way to stop the white pawns, so Black resigned.

The motif of advancing the pawns closer to queen strikes one at first glance. And certainly, with his knight so far away, the white queen has trouble coping with the excellently-coordinated black pieces, supporting their passed pawn.

30...Qxg2! Qxg2! 31.Rg1 f3 32.Nb5 Nxb5 33.Rxg2+ fxg2 34.cxb5?

Now, the black bishop can support the passed pawn from f1 rather than h3, which facilitates the bringing up of additional help in the form of the h-pawn.
It was essential to play 34.Qg1! Bh3 (34...Nd4 35.Qxg2+ Kf7 36.f3 h5 leads to something close to a positional draw –