This always happens when Yahoo is doing updates. For example, about 20 minutes per day between 4-6am EST their database goes offline to do their daily additions/removals. During this time you get Google only. Whenever something is wrong or being done to their master database, Yahoo just removes their search results and let's google go in place (their secondary provider). Nothing special there. Yahoo would be stupid to remove their primary listings, that's what made them so big to start with and so many webmasters pay big bucks for inclusion.
WG
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I play with Google.
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