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.
(hide) If you click on a person's name and then click Finished games you will have a list of games that have been completed, then click on the name of the game to get a summary of all of these games, then click on the name of the game again and you will have a game to view and analyze. (Servant) (show all tips)