AP stands for Advanced physics, it’s like Q3 defrag in W:ET. The APcup is a friendly competition where the community battles it out for the best times on some new maps that have been made for the event.
Here’s a nice video Sander made showcasing some community members jumping:
Info
Start time: 19:00 CEST
Format: 3 days per map, with 5 maps
Server IP: timeruns.net:2013
Have fun! 
Source: http://forum.timeruns.net/viewtopic.php?f=3&t=216&p=629
For new players (Getting started): http://timeruns.net/start/
It would be cool to see some new faces. 



