(Referenced by 225; 392)

: ( 226)
Black plays the kikashi in the bamboo joint.

: (A 259)
White must answer Michael Redmond's kikashi with the atari in order to not lose Joachim's Ko-Semeai ( 1023).
White will be unable to win unconditionally on territory, instead.

:
Following a suggestion by Joachim, Black closes his top left corner, dramatically reducing White's options, what we have already examined in a comparable position ( 243).

: (86 261; C 264)
White is forced to capture Black's nakade stones in the most efficient way, therewith entering Joachim's Ko-Semeai.
Securing two eyes for her group on the upper edge with a move at , instead, will not lead to success, as we have already seen earlier ( 247).
We have also seen earlier ( 245) that choosing the guzumi point of successfully needed the solid connection of as answer to Black's kikashi in the bamboo joint ( = ). However, this option is already lost here. If White tried this move anyway, she would lose by one point.

If White plays at , instead, Black cannot connect at ; otherwise, he would lose the Punishment Semeai. However, Black will continue with the guzumi of , and win the Capture Variation by five points. Compared to White's move at , White loses an additional three points by Black's guzumi, and another point of territory by her move at itself.

: (99 267)
Black has already reinforced his position in the top left corner, so it might be tempting to cut at , instead. However, counter-intuitively Black would be overdoing things with this aggressive measure.

:
White has lost her potential ko-threats in the upper left corner, so she has to start the ko-fight "early". We have reached the same position as in a sub-variation shown before ( 250). White will win the game.

This result implies that Black can enforce an "early" start of the ko-fight even with the main line of Joachim's Ko-Semeai, if White had not pre-empted Black's blocking move of (= ) in the top left corner.