Not sure if talking about it or requesting it to be reopened or something is allowed but when I was active around 2011 there was this thread https://forums.d2jsp.org/topic.php?t=24255013&f=198 going on for guessing anime screenshots.
Of course last post was 2016 so it's well over the 3-5 month limit on posting in it.

Maybe a similar thread is already going on that someone could point me in the direction of if not it's all good.

would have to make a new one.

half the reason these threads die off is because Reverse Image Search exists now and takes the fun out of them.
you have to go the extra mile to personally find obscure scenes and or really crop the heck out of it just so google can't pick that shit up.

would be a different story if it was a Guess this Manga thread.
since Reverse Image can't handle the black and whites very well.
but i feel it's also hard to remember manga scenes for that exact same reason so that's probably why a thread like that never really picked up. (it's just easier to remember anime)