I am aware of the ITF "Official Sparring Rules". These rules state that a competitor will be disqualified if he either knocks out or renders his opponent unable to continue.
Then we all speak of this contact sparring (with head punching)and listen to others tell us how it just isnt that way. "In the WTF we fight full contact"...blah, blah, blah..."ITF Point Fighting"...blah, blah, blah...
Well check out this link to see international ITF competitions won via KO (without helmets!) I encourage you to view many of the available clips to see ITF-GTF sparring at multiple ability levels. http://changhun.1go.dk/?page=linkshare