Here's the rules for tanto randori:
I think this is bullshit- hooking with the knife or attacking with the elbow bent is not ineffective in the least. I hate how they phrase stuff like their rigid techniques are the only effective way to use the knife.
A.Criteria for tsuki-ari (effective tanto techniques)The pre-condition for tsuki ari(effective tanto stabbing) is that Tanto’s arm must be stretched when the rubber knife lands in Toshu’s body. If one stabs with his elbow hooked at a right angle, it will never be accepted as an effective one.
Only the torso? A knife attack can be lethal from the knee up, and attacking the hands and arms is day 1 stuff in knife arts.
a. The rubber knife must land in the part of the opponent’s body between armpit and belt levels. This includes the front, back, and both sides of the body, as well as the upper arms. However, the belt itself is not included in the target area.
now you're gonna tell the guy how to stand?
b. Tanto must step in and stab with his back straight and his balance stable.
It just keeps getting more restrictive.
c. The rubber knife must touch the opponent’s body at an approximately 90
degree angle. But this particular condition does not have to be satisfied when Toshu is either off balance, has assumed an undesirable posture, or has already fallen on the mat.
If secretly punching is superior to the knife attacks allowed, maybe the attacks allowed should be questioned.
knife stabbing should never endanger the safety of the opponent. Particularly, the type of stabbing with the fist landing directly on the opponent’s body is subject to
penalization. However, if Toshu comes in without proper taisabaki, it is considered to be his fault.
Again, calling anything but a stiff karate punch with a knife "inadequate" or "ineffective" seems to misunderstand how a knife works combatively.
Inadequate (ineffective) or invalid stabbing
1. Tanto techniques that do not satisfy the above conditions will not be counted as effective stabs.
2.Tanto techniques will also be regarded as invalid unless the tip of the rubber knife has clearly touched Toshu’s body and Tanto has stabbed with proper foot movement.