To find out what stairs you can currently challenge someone in, first go to the Main Stairs Page, then click on "Show your stairs only" link. The ones in BOLD are ones you can make a challenge in.
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MadMonkey: Probably easier to implement: If you timeout all your games in a match you get automatically thrown out, with a message telling you why.
Only exception - you have already retired from the stairs (to prevent the case that you legitimatelly retired for going on holiday or something but had already a game running that you timed out). In that case you get to stay in the Stairs.
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