I should clarify more about the above technique I use for competition.
This technique is used when in closed fighting stance. The attacker throws a rear leg round kick, which I can already anticipate. A good fighter can anticipate his attackers attacks so that he can counter accordingly. You have to learn how to read your opponents, this can only be down through actual sparring practice.
But I dont just wait for the attacker to kick and then I just block. What I do is, I scoot in and block his kicking leg near the inner thigh area. I don't wait for him to extend his leg. This block is meant not to block the kick but to nullify the attack altogether.
Immediatly after I down block his inner thigh, I follow through with a reverse punch which should score a point. If not, I can continue my attack with a rear leg round kick to face or chest.
Tip: There is a secret to this technique. When you block the leg, you can secretly maintain or hold it (trap it) in place for a few moments, this keeps the opponent off balance which allows you to follow up with a kick to either the chest or the face.
This is the only technique I can think of where a down block is used in competition to set up a punch to score. In a self defense situation this down block would really be an attack to the inner thigh, it can cause a nice bit of damage on the attacker. Durrin tournament it is forbidden to attack a limb, however, with this technique you can get away with it. Once you have the leg blocked you can secretly open your hands into a knife block and slightly maintain the kicking leg trapped for a moment to off balance your opponent, leaving you an oppertunity to score. If your bold enough to take it. I know my students are. How about you?
I decided to revive this thread, it has some nice diverse opinions about sparring and it's purpose. But mainly I just liked what I posted. LOL