Thank you for your detailed contribution!

Ah, but if you didn't make a prediction on a question, you still got a Brier score for it — GJP gave you the median score of the group members who did make a prediction.

Hm, yes, that makes sense as these scores are listed in grey in my coulmn too. I just didn't make that connection and can't seem to remember that it was explicitly explained that way - but maybe I misunderstood which averaging applies to which. Esp. before actually seeing the UI.

So the trick is to choose questions where you expect to do better than the median predictor, even if those questions look difficult...

Yes. That seems like another sensible strategy to game it,

I recommend that you send this as a reply to one of the last mails. They seem to really read them.