Gypsy: The finest part of this game is its fathom part -- the part that was to follow instead of White's resignation without resuming play after the adjournement. First the preambule: Black <44...a5> had to be played immediately, as otherwise White would get in his own 45.a5 and thus turn tables on Black.
Next, White is oblidged to immediately play <45.g4!> to preempt 45...g5! 46.h5 g4 .
Now, both kings dash into the center <45...Kg8 46.Kc2 Kf7 47.Kd3 Ke6 48.Ke4> and set up the key thematic position <I> and some pretty king square-dancing.
The position is semi-blocked and so corresponding squares (=fancy triangulations and opositions) will be at play. But the position is only partially blocked and the squares of passed pawns, pawn breaks, and pawn-at-a7-drawing positions all come into play, at least latently.
Should it be White to play in <I>, his cause would be lost in a straight forward fashion, eg., 49.Kd4 Kd6 50.Ke4 Kc5! .
The main <A> line of our square-dance goes thus: <48...Kd7! 49.Kd3! Kc7!!> and now <50.g5 Kd6! 51.Ke4 Ke7! 52.Ke3 Ke6 53.Ke4 g6 >; position <II>.
And key switchup <B> choreography finishes: <50.Ke4 Kc6! 51.g5 Kd6! 52.h5 Ke6 >; position <III>.
It is too easy to go wrong here however; even very wrong. Dedrle gave 48...Kd6 49.Kd4! Kc7? (49...Kd7! returns to the main line) which was refuted by E. Richter's 50.g5! (50.h5 also draws, but 50.g5 contains a winning trap) Kd6 (50...g6? 51.h5! ) 51.h5 Ke7 52.Ke3 Ke6 53.Ke4, position <III> but Black, not White has to move. Black no longer can force a win: 53...b3 54.Kd3 Kf5 55.h6 =.
If, <C> variation of the main line, <49.Kd4>, then <49...Kd5 50.g5 Ke6 51.Ke4 g6> and Black again arrives in the winning position <II>. Note though that 51...b3? 52.Kd3 only draws.
If, <D> variation in the main line, <49.Ke3>, then <49...Kc6! 50.g5
Kd5 51.h5 Ke5 >.
Some finer points of the main <A> and <B> lines still need illumination: First <51...Ke7(d7)!> is quite necessary in <A>, as 51...Ke6? 52.h5! (position III with Black to move again!) and 51...g6? 52.Kd4 Ke6 53.Ke4 b3 54.Kd3 both draw. Second <51...Kd6> is quite necessary in <B>, as 51...Kc5?? 52.h5! at least draws for White.
One can say that White resigned prematurely. While White position is indeed lost objectively, he could have played on and let Black prove the point.