"Chess" can't be deleted because it's required by Mac OS X - Seriously?

I just upgraded the family iMac to Lion. Although I don't think I'll use Launchpad myself, it seems to be great for non-geek users, so I wanted to clean up the apps and only show the ones that are used often. I threw a bunch of them into a folder called "Stuff" to keep them out of the way, but then I saw Chess.

Does anybody really use Chess? I don't think I've opened it in ages and I deleted it from my MacBook a long time ago. But it was there in the family iMac. I tried to deleted and I got the following message:

Chess can't be modified or deleted because it's required by Mac OS X

Seriously? I can't delete it? And it's "required" by Mac OS X? What the hell does the OS need chess for? Playing while it's bored waiting for the user to do something?

I get preventing users from deleting some critical apps, but Chess? Seriously?