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In fact there are two Yahoo.com algos: one in US and one in Europe.
In Europe it seems the old algo.
Few days ago I realized that the European database is more fresh than the US database: in fact several new pages I added in one site few days ago show ( and rank fine ) in the European database but do not show at all in the US Database.
I think that Yahoo is still experimenting the new algo in US.
I can check the US algo logging in Yahoo using an anonymizer software.
I don't know if US surfers can see European Yahoo serp.
I hope that Tim could say something about that....