From the official help page on searching:
The following search operators can be used with values of yes/no, true/false, or 1/0 (each pair behaves the same):
- [...]
isanswered:
yes/true/1 returns only questions that have at least one accepted or positively-scored answer; no/false/0 returns only questions with no accepted or positively-scored answers.
But this is not how isanswered:
is actually working!
For example, see this query. Searching on the SFF site using is:question isanswered:0 answers:1
should return questions that have at least one answer but no accepted or positively-scored answers. Instead, the results include questions like this and this which have accepted answers.
The description of the `isanswered:` search option should instead read something like:
isanswered:
yes/true/1 returns only questions that have at least one positively-scored answer; no/false/0 returns only questions with no positively-scored answers.
Well, either that or the actual search algorithm should be changed, but I bet I know which is easier!