As part of the campus-consuming event that is OWW, this year a counter-strike tournament is being run TOMORROW EVENING (27th) in the library from 6-9.

Format is 5v5, and you'll need to enter a team here: http://signup.oneworldweek.net/

This isn't a compsoc event and I don't know any more than this. (Not even if it's 1.6 or source). If anyone enters: good luck.