sanyas: 17.a5 ♘c4+ 18.♗xc4 ♖xd4+ 19.♗d3 ♗c4 20.♔c3 ♗xd3
24...♖a8 25.♖xa8 ♖xa8 26.♖xa8 ♘xa8 27.♘g3 g6 28.e5 kd7 29.♘e4 ♔e7 30.♘f6
26.Rg5!
"This move, in connection with the next, is a very good manoeuvre; the intention is to advance with the pawns on the King-side and then break through in the centre at a suitable moment. The immediate advance of the King-side pawns (eg. 36.f5 followed by g5) would be pointless, as the Black pawns have not yet been weakened; for this reason White forces the advance of one of the Black pawns." - Pachman
28.f5?
"More precise was 28.h4! Nd6 29.Nc3, after which White can choose White can choose f5, e5 or g5 as the position demands. The text move complicates the situation considerably." - Pachman
37...exd4
"Stronger is 37...e4+! 38.Ke3 Rh8 39.R5xd5 Rh3+ 40.Ke2 Rh2+ 41.Kf1 e3 42.Re6! Rc7 43.Rc5, and although Whaite has good prospects, it is doubtful whether he can win against best defence. After missing the chance, Black sees his opponent convert his passed pawn on f5 in a most instructive manner." - Pachman
42...♖e8+ 43.♔f5 ♖f4+ 44.♔xg5 ♖8e4 45.♖f5
46...♔c6 47.♖xg5 ♖f1 48.♔e6 ♖e1+ 49.♔f7 b5 50.♔g7
47.Rxb7!
"It is interesting to note that Black only loses because of the existence of his King-Knight-pawn, which shields the White King from perpetual check." - Pachman