Is there any games to play online on a mac?

[Ved]

but like... just one on one games, sort of like playing chess on msn or cards or stuff like that, but just a one on one?

 

[Babooshka]

Go to Shockwave, register and you can play one on one.

Same with Miniclip, register and you can play one on one, like 8 Ball Pool, 9 Ball Pool, etc