The key match here is ejett-vasja: if ejett wins, he advances regardless of the remaining games. If not, then in principle, 3 people could advance: denden, ejett, or vasja... So, you should try to play all the games if possible, or at least start with the first match-up...
In group B, dmitrik and kolobokk are definitely advancing, and since vsev, wolf, and mister-x have disappeared somewhere, I think mkadan will be the 3rd person to advance...
So, maybe we can start playing while the 2nd stage is ongoing, and determine who is definitely out? There's a round-robin system against those they haven't played in the group, so let's identify the 3rd person to advance in group A and then move on...