Which has more? And we are taking here about pages indexed in search engines. It has been always thought that Yahoo, which entered the search engine field, as an outsider, has a long way to go before reaching Google's level and that the latter is the champion when it comes to the number of indexed pages.

But its supremacy is seriously threatened by Yahoo. Tim Mayer from Yahoo Search posted yesterday, one year after the opening of Yahoo Search Blog, a synthesis of the Yahoo Search service.

Aside from the introduction of vertical searches, such as audio, video and images and of Yahoo Desktop Search, the interesting part is that Tim Mayer talks about the dimension of the Yahoo Search index.

According to that information, Yahoo Search is currently indexing 20 billion documents: 19.2 billion web pages and 1.6 billion images. Tim Mayer said that aside from these, Yahoo Search is also indexing 50 million audio and video files.

The statement is somehow surprising since Yahoo officials have seldom discussed in public about the size of the Yahoo Search index, which, according to these values, is way ahead of Google's.

According to Tim Mayer, the quality of the searches is still the most important factor; he also says that Yahoo is trying to improve this parameter. Yahoo is currently using a system called RCFP- Relevance, Comprehensiveness, Freshness, Presentation, which has received awards in the online searching industry.