Yahoo has changed something. In the past few days, one of my sites has been de-indexed by approximately 1000 pages. This was slightly MFA type so may have been penalised.
Another site which is all good, unique content, no "search engine optimised" coding has been completely indexed for the first time. I have made some yahoo searches that I've seen bring bad pages in the search results but now am getting pretty much all related and good content.
So yep, I'd say yes that they changed their algorithm.
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