In Choi's 1959 book Tae Kwon Do Teaching Manual, the Shotokan karate low block chamber is used. But by 1965, the chamber had changed to the wrist-to-wrist position. Many ITF basic techniques -- including the rising block, backfist, and knifehand strike -- utilize this chamber.
In this chamber, the blocking tool sets up inside the pulling tool, with the fists oriented such that the back of the wrists can touch each other.
|ITF Low block|
- You do an initial parry against a linear attack with your front hand.
- You do a secondary parry with your back hand (parry-pass) and grab. This forms the chamber.
- Pull in the opponent's arm to your hip while you use your front hand as a strike.
|Source: Ryan Parker|
|In this 1956 taekwondo demonstration, we see both the chamber and pulling hand utilized. Source: hapkist|
The chamber could also be used as a flinch block against a swinging attack. Since the pulling hand is on the outside, it can catch the opponent's arm and pull as your strike. This application is similar to the above gif where a punch is deflected outward.
The ITF rising block also uses this chamber. For two consecutive rising blocks, the chamber may be used to create a rudimentary figure-four lock. The application goes like this:
- Use the first rising block to block an attack or raise the opponent's arm
- Stepping forward, thread your other arm over the opponent's elbow as you grab their forearm with the blocking arm. This creates the chamber
- Circle behind the opponent and pull down their forearm (pulling hand) while lifting their elbow (second rising block), creating the lock.
|Source: Nantanreikan Karate Dojo|