Yes, once the match has begun, bending the wrist (or "Hooking" is allowed). John Brzenk is known mostly for his array of techniques which change almost every time he is engaged in competition, even with the same opponent within the same match. As of Summer 2008, John Brzenk is ranked #1 in North America, and arguably, considered the best arm wrestler in the world. Ron Bath is known for his use of the Top Roll technique which emphasizes a 'roll' of the wrist as he brings the opponent's wrist down. Travis Bagent, like Brzenk, is known for his wide array of techniques, coupled with his massive strength and explosive style. Many of Bagent's matches have ended in seconds. However, Bagent is most well known for his colorful remarks and rather rude comments against his opponents. Bagent is considered the best left-handed arm wrestler in the world and is currently ranked second overall in North America, as of Summer of 2008. Other competitors such as Matt Girdner, Michael Selearis, Marcio Barboza and Christian Binnie, are known for their reliance on strength, coupled with the hook technique, where the wrist turns into a hooked grip after the referee has started the match. "The Hook" or "Hooking" is a generic term used to describe any move derived from the inside system of arm wrestling the second generic system or style of Arm wrestling is known as outside arm wrestling "the Top Roll" or "Top Rolling", whilst the "Tricep Press", "Shoulder Pressing" or Shoulder Rolling" is often described as the third generic system or style of arm wrestling. http://en.wikipedia.org/wiki/Arm_wrestling#Competitive_styles You can find Rules and Foul information on the WAF website - http://www.armwrestling.com/OLDCOM/000rulesandregulations.html