But slipping in a dirty technique knowing you will get a warning the first time as a way to obtain an advantage?
That is counter to one of the Five Tenets of TKD: Integrity
~ http://martialtalk.com/forum/showthread.php?t=50341
I think this brings up a interesting question about a blurry line.
Where is that line between using the rules to your advantage and loss of integrity? In a MMA fight a weaker ground fighter might try and stall out on the ground to get a stand up, or a superior wrestler might work control and weak shots to score points for a decission rather then looking to finish. These are seen as acceptable, if not greatly entertaining.
In a point fighting tournament someone might take advantage of a rule against sweeps to hop around on one foot, another might take advantage of the fact that using a sweep once only gives you a warning and take there one "free" foul.
Where is that line between winning by using the rules to your advantage, and poor sportsmanship?