On the 'Unanswered' page, you will see grey boxes beneath the navigation bar with the green buttons. One of the grey boxes allows you to sort by questions with no selected answer. Alternatively, here is a direct link. You can also sort by questions with no upvoted answer.
The usability of the page is somewhat limited though, as people don't consistently select answers, and there are questions like the moveset threads where BAs are never selected. I'm planning to go through the 'no selected answer' list more often in the future to select answers that deserve the BA, which would make the page more worthwhile. However, I don't have time on my hands currently, so that will have to wait.
An alternative would be to implement a 'mark unresolved' feature, which I've wanted for years and will plug here once again because it would be super cool.
