vinidivici: Wanna draw?
Its easy: Sacrifice both pawns!!
52.g5!! Kxg5 (first sacrifice)
53.b7!! Rxb7 (second sacrifice)
Now from that conclusion we know, the 2 black pawns in the same file could be useless if we know how white should defend....
But actually its the finesse of Ulf that made the win so special. He's smart enough not to take the pawn at the move 50.
if 50...Kxg4 51.b6 Rd7 52.b7! Rxb7 53.Kd3 Rb3+ 54.Ke4...draw
See that after 52...Rxb7 the position almost similar with the main draw line except now the black king at g4 (instead g5)....its both draw.
From both lines we can take the straight logic...black king needs to protect the e3 pawn because the threat of white Kd3, so from this POV Ulf's 50.Kf4 is the RIGHT THING to do.
So unfortunate for Der Wiel didnt find 52.g5!! but even that, there is another draw chance once more, look the last line under.
Theres another smart move again by Ulf beside 50...Kf4. That is 53...Kg3 (instead 53...Ke4).
53...Ke4 straight to the draw. 54.b7!! Rxb7 55.Kd1 ...draw white king soon in front of the pawn.
If 54...e2 (instead Rxb7) 55.b=Q e=Q 56.Qe8+...draw
Back to the main draw line, how if black reject the pawn
60.Qxd7...apparently still DRAW.
Another draw line
Besides all the lines above, even without 52.g5, white could hope the draw with 53.Rh2 (53.Rf6? is a mistake).
If 53...Kxg4 then 54.b7 we already know draw.
53...Kf3 (53...Kg3 54.Rh5) 54.Rh3+ Kf2 55.Rh2+ Kg3 56.Rh5 Rd2 57.Kc1 Rd5 58.b7 e2 59.Rh1 Rd8 60.b=q Rxq 61.Kd2....draw, black pawn will down soon.
-my analysis (partly)
-Mednis' Practical Endgame Lessons