I generally use the filter
hasaccepted:false, and think others do too. (Try it with this link.)
The clickable searches include
unanswered which, on puzzling, may be more useful if it were
unsolved since puzzles often get some kind of answer or answers before being solved (nearest thing filterable being
I also note here that it is likely that newer users are generally unaware of the textual search feature, and will see and use the clickable ones.
Do people agree that we should request this?
(I actually do:
hasaccepted:false closed:false duplicate:false locked:false hasnotice:false and am sure the tab would do something similar)
Edit: I agree with humn, adding
unsolved would be preferable to changing