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He is responsible for promoting a successful UK toy site. He doesn't do any shady (black hat) tactics. He had done quite a lot of Inktomi, Fast and Altavista inclusions which ran out in April. It appeared that the site had been crawled by the freecrawler.
When the paid inclusions ran out the pages were still in the index, indicating they had been crawled, but the rankings had dropped dramatically.
In desperation he signed up a few URL's for Sitematch. Once they were approved the pages the rankings for those pages dramatically increased. To check if the manual approval process had lifted any penalty on the pages he changed the URL to another one on the site. The original URL used for sitematch has dropped in ranking since it has been removed from sitematch.
So sitematch doesn't help rankings?
PositionTech also said that Yahoo tweaked their algorithm about a week ago and my colleague should wait to see if the site was picked up properly.