Taken from googles program policy Sites displaying Google ads may not include: - Gambling or casino-related content I'm certain poker falls into this category. Even though there isn't any gambling on your site, it is still gambling and casino related content. That is just my opinion though, if you disagree you should email adsense and ask them yourself. Better safe then sorry.
I have asked Google and you cannot have adsense on any poker related page, not even discussion on strategies. (I asked specifically for that.)