*Request*: Document the `isanswered` search parameter on the [advanced search help page](http://stackoverflow.com/help/searching). 

##Update

This has been implemented by adding the following to the help page:

> 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.

Unfortunately, the above **[is incorrect][1]**: acceptances are ignored by this search. The correct description would be: 

> 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.


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###Rationale

From time to time users ask about searching for questions that are unanswered-in-SE-sense (no accepted answer and no positively scored answer). For example, [Deduplicator asked yesterday](http://meta.stackoverflow.com/questions/286912/what-is-the-new-answer-similar-questions-feature-for/286915#comment161363_286915):  

> What about adding a new operator to search, which restricts the same way as the unanswered page?

The older thread on this is http://meta.stackexchange.com/q/16542/259867 where the answers include: using `hasaccepted:0`, using `answers:0`. There is also a feature request there to have `ascore:0` parameter to handle the presence of answers with positive score. 

Yet, all this time SE did have a search parameter for filtering questions based on answer score: `isanswered`. As [m0sa explained](http://meta.stackexchange.com/a/250187/259867), its logic is actually `hasAnswerWithScoreGreaterThanZero` 

Thus, the combination `isanswered:0 hasaccepted:0 closed:0` matches SE definition of an unanswered question. 

For example, [this search](http://stackoverflow.com/search?q=isanswered%3A0+hasaccepted%3A0+closed%3A0) nearly matches the [questions/unanswered view](http://stackoverflow.com/questions?sort=unanswered) on Stack Overflow. (The numbers are not exactly the same, either because of caching or because of some narrow edge cases; for practical purposes the results 
are the same. 

One can now filter by tags and/or question score, then sort by dates, etc... like you always wanted. For example,  when I'm feeling generous, I combine this search with `intags:mine` and `answers:1..` to review answers on unanswered questions and maybe upvote them, taking the question out of unanswered. 


  [1]: http://meta.stackexchange.com/a/250187/259867