(Referenced by 190; 227; 818; 937)

This chapter explains the theoretical foundations of a special type of semeai, which arises in Joachim Meinhardt's idea ( 219) to prevent White's large endgame in the upper left corner.
The presentation follows the course of our growing insights into this particular formation. For a long period of time we were unsure about the best time to start the ko-fight, especially whether White should choose an "early" ko (i.e. a few moves after creating the ko-formation) or a "late" one (i.e. after Black connected the hanezeki's tail).

Please understand this chapter to be supplementary only now; probably it might be still useful for readers with a more mathematical approach.

It was written before our intense work on "Putting the Cart Before the Horse" ( 937) - using the method of reverse engineering, instead - which shows our up-to-date results. We ask for your kind understanding that we still shied the effort synchronising both chapters. However, it has always been found to be advantageous to illuminate a situation from several directions. Mismatches were always quite helpful suggestions for further intensive studies.