A more formal announcement should be posted and emailed later today, but a large part of the US Chess website will be unavailable starting at around 9AM EDT on Tuesday, September 22nd as we complete some updates that we have been working on for several months. This will include MUIR, the US Chess home page and the membership system.
It appears the system revisions are complete and the US Chess website, membership system and MUIR should all be back online.
There could be some propagation delays for the new IP addresses for the MUIR pages, if you get page-not-found messages try closing your browser or restarting your computer.
Thank you for your patience as we continue the upgrade process for US Chess information systems.