When run in teamplay mode, this is a double domination map (similar to UT2K4's double domination mode). A team must hold objectives A and B for 10 seconds to score a point. The map ends at 12 points.

The map's .vmf source is available here:

http://www.filefence.com/viewtopic.php?t=279

You can get a template to make your own double domination maps there, too.