I have seen something like that before as well, and it’s definitely cloaking. When you type in the domain, everything is fine, but when you click on the link from the search engines, it redirects you automatically to a poker room.
One has to especially pay attention to this when exchanging links, as the sites doing that usually try to exchange links with webmaster and if you don’t check the site from the search engines, you will not know that they are doing the cloaking! It happened a couple times to me already!