I've looked in Game Center on Mountain Lion and in the Chess game, but I can't seem to see a way to play Chess over Game Center. Does Chess for Mountain Lion support turn-based play? If it does, how can I enable it?
MacOS – How to Play Chess Over Game Center in Mountain Lion
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Related Solutions
That login banner is a provided aspect of the Game Center API in the iOS SDKs, as far as I'm aware there is no way as a developer to disable it from opening when the Game Center login completes. As a user, there is certainly no way to disable it, because it is part of the application's compiled source code.
However, note that it's not the banner that is causing the delays and skips. It is actually the entire login process to Game Center. My only advice is when you open a game that has Game Center logins, open it up to the first functional screen, and just wait the ~5-10 seconds it takes to reveal the Game Center banner. After the banner has displayed and disappeared, proceed normally and you should not be affected any further.
If you open the Game Center app, at the bottom of the Games tab there is a "Find Game Center Games" button:
Which goes to this page which has a list of Game Center games (there are currently only 8).
Also, some apps on the App Store will mention in their description that they have Game Center support. And you can see some games are featured with text saying they've been updated to support Game Center:
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Best Answer
First of all, make sure you have added your systems knows about your Apple ID (go to System Preferences -> Users & Groups -> Your User -> Apple ID).
Then launch Chess; obviously you'll need to have an internet connection.
After a short wait (a second or two in my case, might depend on your internet connection), a badge like the following should appear in the Chess window:
After it appears, you should simply be able to go to Game -> New... and select GameCenter Match in Players.