Yahoo has changed the way they handle a query for a competing search engine. Now, if you search at Yahoo for google, live or ask.com, Yahoo will tell you, “You could go to [Search Engine Name Goes Here]. Or you could stay here and get straight to your answers.”
This is a lot more humorous than what Yahoo did in the past. I have a screen capture of how Yahoo handled this in the past at the Search Engine Roundtable. Here it is:
You won’t always get a search box, I believe if you refresh your search, Yahoo may remove the search box. Here is a picture of the same message, without the search box:
Do you get the message? Why go to Google, when you are already at Yahoo? Why not just stay here? I suspect it works because I cannot tell you have many novice searchers use search engines to find other search engines.
Do note, the other three search engines do not currently do anything similar.