When Scores and Rankings May Be Discarded
The PL/SQL Challenge site was unavailable for the last 3.5 hours of 24 November. Up to that time, 1149 players took the quiz. This means that it is likely that several hundred players missed the opportunity to play.
It is very unfortunate that this happened, but the rules and the rules; the results for 24 November will be counted in rankings.
Of course, I very much hope and expect that this sort of thing will be a very rare occurrence. Having said that, it probably wouldn't hurt to get into the habit of setting aside two times during your day when you try to take the quiz. That way you have a "backup."