how to google detect if two page is relevant? for examle: if page A is about war3 game, and page B is about wow game. 1.if the two pages have not same kw.(even no kw "game" in them), does google think the two page are relevant?(obviously ,they are both game site) 2.if page A is about how to make more wow gold(not buy wow gold), page B is about real gold. does google think the two pages relevant？