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Couple this weak-side position with the 45 degree angle that can destabilize the stance of the opponent and you are in a superior position from which to counter. This also brings up the use of parries to continue the opponent’s momentum instead of stopping it so the opponent does not have a chance to more easily recover his momentum. Thus the other side becomes the strong side where another punch or kick can come from. Our understanding of the weak side would be more or less equivalent to accepting the side of the body that just released a kick or punch before limb recovery as the weak side, since momentum cannot yet be regained to set up a secondary strike. This particular angle will allow good positional control from the side and slightly behind the opponent and allow control of his weak side.
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Keeping that basic idea of quadrants in mind, where the opponent is on the top of the Y-axis and you on the bottom, an example of moving to quadrant one would be as follows: If one looks at a linear, left jab being the attack of the opponent, when both are in orthodox karate or boxing stances with the left foot forward, the defender would move parrying the strike with his lead left hand, moving around the strike and would end up in quadrant number one at a 135 degree angle to the directional plane of the jab.
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Well, I guess it’s a little hard to explain without showing, but I’ll try my best to give at least a basic description with two examples, though these are idealized. I know a bit vague, but thought I would offer. In our tradition, this really implies that positioning and blocks would be considered of higher importance to striking on the hierarchy of considerations when defending against an attack. Parries would be used most often with the idea of continuing the attacker's momentum, not stopping it, so better positioning would be available to the defender. Movements would consist of either circular movements around the attack, or angled linear movements moving at 45 degree angles to the plane of the attack.
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Top left can be named quadrant one next to it, on the right, quadrant two below it on the left, quadrant three and finally on the bottom right, quadrant four. This can be modeled on an X-Y axis where the opponent would be standing on the top of the Y-axis and the defender on the bottom, divided by the X-axis. Within this basic step work is the consideration of weakness of the opponent's position as it relates to his stance and also an understanding of a weak side/ strong side potential of attack from the opponent. In the school that I am familiar with, we use a 12-step paradigm (and variations on these) to model basic movements and counters to an opponent's attacks. Tai Sabaki, or just Sabaki as we use it, coming from an Ashihara Karate tradition, would be integral in the evaluation of movement as a response to any particular technique.
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