Another very interesting point which shows that the two engines have a completely different idea of “relevance”.
None – I repeat NONE – of Google’s top 12 for “online gambling” appear anywhere in the top 100 of Yahoo.
And only 5 of Yahoo’s top 10 appear in Google’s top 100.
It’s even worse when you search for “online casino”.
Only 12 sites show up in both indexes. In Yahoo they are all top 50. Google’s top 6 are not represented in the Yahoo 100, and Yahoo’s top 2 are not represented in the Google 100.
Summary – you probably won’t be able to build one page to work in both indexes – and if you do, it’s probably better optimized for Yahoo and only in Google because of off-page factors such as pagerank or inbound links.