At the same time, it expanded the importance of the initial play at the 3-3 point in the corner.This stone does not tend to make nearly as much corner territory as the more traditional play at the 4-3 point, for example, but it has the virtue of establishing life in one move, so that one can quickly expand out from it. Also, a whole new collection of jungsuk had to be developed for the new initial plays in the corner. [Jungsuk (Japanese: joseki) denotes the local opening strategies; optimal sequences of plays (usually in a corner, but sometimes on a side) to attain specific local objectives.-- editor]
These ideas were pioneered by Wu Qingyuan, born in 1914, and Kitani Minoru, born in 1909. They constituted a conceptual revolution, born of the spirit of a new era and the efforts of a new generation of players who were not yet firmly married to the older ideas. Plays at the 3-3 point became more widely used, the base of initial plays was expanded from the third line to the fourth and fifth lines, and the concept of influence became as important as the concept of thickness.
I once wrote the following:
"Everything has been stood on its head since the announcement of Wu Qingyuan and Kitani's ideas. Their view has changed the entire way of understanding what is seen, the thickness, and the actual power of stones, their influence. Even the method of attack has changed. Everything suddenly has a new beauty, as when one falls in love."

-- by Moon Yong-gik, 4-dan