Looks like a Syriza overall majority is a possibility.
If that happens, then Syriza can get on with the two jobs that need to be taken care of quickly.
- elect a new president
- negotiate a continuation of the troika bailout.
The first job isn't as hard as it sounds - ask the last parliament fell due to its failure to elect a president, the new parliament will select one over three rounds of voting, where (on the third round - ie after two failed votes) a simple majority is enough to elect a president.
The second job seems to be much more difficult. It is very hard to see a compromise Tsirpas could achieve that can both get past the troika and also his own party.
A slender majority allows very little room for resignations.
To paraphrase Brendan Behan, for Syriza, "The second item on the agenda: the split"