It seems Yahoo has updated the algorithm used to determine which Yahoo Answers questions get posted to the main SERPs. So what’s changed?
Before the change, the results on search.yahoo.com were directly related to the search results that where given on answers.yahoo.com/search. For example, “what color is the sun” would include only answers that where returned here and in the same order but minus certain listings. The difference being Answers search results included listings that could be open or closed and may not have had a best answer while the main Yahoo SERPs included only listings that where closed and had a best answer chosen.