Of course, Mao Yihua would never have imagined that Li had long known of this so-called Turning Square into Circle. This move came from Heroic Chronicles; Li simply had not expected to encounter it in this world.
Turning Square into Circle and Transforming Circle into Square essentially meant the same thing. When this move was used, the tip of the blade traced out a massive circle, blocking every attack the opponent sent forth. Because it was a circle, no matter how fierce the opponent's techniques were, their force would be dispersed, naturally rendering them ineffective in the end.
However, this move was not so simple. If you truly just used a sword to draw a circle, it would be utterly meaningless. People had instincts, and those instincts would only make the circle you drew imperfect. From the perspective of geometry, there was only one way to solve this problem—Turning Square into Circle.
A circle was formed from purely geometric lines. First, one had to understand that a circle was merely a polygon with an extremely large number of sides. Yet to reduce the variables of that polygon without limit, there was a necessary condition. An equilateral triangle could be drawn, as could a regular pentagon. The prerequisite was that, aside from themselves, there could be no other number in this world that divided them evenly. To draw a true circle, one could only use polygons obtained by one two, two twos, four twos... plus one. Only then could one create a circle whose center did not shift—or a square that carried the essence of a circle.
Only such a circle could completely deflect the opponent's force. In Heroic Chronicles, this technique could be said to suppress every swordsman under heaven, yet Mao Zhihua had actually comprehended it.
Later, Mao Yihua