Committed Attack is a maneuver absent in the basic set introduced on page 99 GURPS Martial Arts in September 2007
Prior to this it was alluded to in a February 2007 post http://forums.sjgames.com/showpost.php?p=366462&postcount=48 by Kromm:
- The more masterful the fighter, the less he typically moves to strike -- and when he does move swiftly, it's more akin to an extra step† than to a sprint
- † Martial Arts will also introduce a new combat maneuver that specifically allows this strategy, and will note that trained fighters are normally the only ones who can exploit it.
The latter note is an allusion to one of the Untrained Fighters notes on pg 113.
The extra step in exchange for a penalty to attack was present in 3e with Fleche but was for fencers only.