We describe our technical approach in competing at the RoboCup 2000 Sony legged robot league. The UNSW team won both the challenge competition and all their soccer matches, emerging the outright winners for this league against eleven other international teams. The main advantage that the UNSW team had was speed. The robots not only moved quickly, due to a novel locomotion method, but they also were able to localise and decide on an appropriate action quickly and reliably. This report describes the individual software sub-systems and software architecture employed by the team.