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This is essentially the QuickStart robot from the Lego Mindstorms nxt kit without the grabber and with a wider front bumper. It took about 15 minutes to build and about three days to program. It can complete the LMR Chair Challenge (see video) by using rotation encoders to follow a preset path - which I feel is a bit of a cheat. However, it fails much more often than it succeeds because it wanders off line and crashes into a chair leg. There seems to be a known problem with the accuracy of the encoders ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/quickstart