How does the Ranking work?

Hi Guys,

I searched the internet for a "configurable meta search engine", and I found THIS! Amazing, that was exactly what I was looking for. I really like your project and at the moment I am getting familiar with Searx. However, I have to say, for my taste the documentation (for users) is very poor. There are a lot of questions popping up my mind, for which I can't find an answer here or elsewhere.

One of the most important questions is: How does the website ranking work in Searx? We know that different search engines use different metrics and therefore the order of the websites differ (and also, which websites are shown at all and which are not). At least, that is the reason why you would use a meta search engine. To collect the result from multiple sources. So the question is: How does the Searx algorithm decide, which result from which engine will be featured at position 1, 2, etc...? I tried to figure this out, but without success. Depending on the keyword, different search engines overweight. And at the beginning (page 1), two search engines often present their result in turns, while on the next page, all results are only from one search engine (however, the other search engine must have a lot more results, too?)

Also (this maybe could be a separate feature request, if it does not exist yet), is there an easy way to filter for special search engines right in the window with the search results? (Without going to preferences, toggling switches, and repeating the search? This seems very laborious...)

So far: I wish you success for the next year, and I am looking forward to start testing and tweaking Searx a bit more.