:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (IIIb)

Tricking KataGo (Triple-Ko)

VAR (C) (A) (.1) (.1)

: ( 222kb)
Black plays Michael Redmond's kikashi in the bamboo joint.

: (A 222kd)
White answers with the atari.
Due to this exchange, Black's previous kikashi provided him with an additional liberty in the Main Semeai, at .

White does not need to choose the solid connection of , instead, just to be on the safe side. She would lose four points overall unnecessarily, compared to the best line of play below.

: (119 222ke ;  109 222kf)
Black descends to the left edge, continuing with the Main Semeai.

Alternatively, he might consider playing the large endgame move of in the lower left, or immobilising White's single stone in the upper left corner with . The availability of these two variations depends on Black's just won Main Semeai Liberty.

In the first case, Black will lose one point overall.

In the second one, he will be one point better overall than with the best continuation below.

:
White covers her weakness in the guzumi area, also continuing with the Main Semeai.

: (121 222kg)
White captures Black's hasami-tsuke stone at the upper edge.

She must not start the endgame at the left side of the board "early", instead, as long as there are valuable endgame spots remaining. White would lose two points overall unnecessarily.

:
This gives Black the opportunity to defend his territory in the lower left corner.

Please note that Black is par with the Punishment Semeai Liberty level again after this move.

:
White captures Black's stone at the upper edge, which is a simple line of play.

There is no need to complicate the issue by attacking in the left centre, instead. Neither result of the Main Variations would be affected.


: ( 125 222ki)
Black captures White's two stones in the lower left in return.

He would like to stop White from playing the wedge at by defending his territory in the left centre first.
However, all his efforts to increase the overall result of the game in his favour will end in vain. Nevertheless, he will be able to benefit in the Semeai Variation.

: ( 127 222kj)
White continues with the Main Semeai.

However, she must not let Black occupy the point of . White would gain one point overall, if she played the wedge in the left centre at , instead.


:
Black defends his territory in the left centre.


After her decision point, White will hane at , and connect at thereafter.
Black will have to connect at .

Black has utilised the tempo that he won with Michael Redmond's kikashi for taking points in the lower left. Therefore, White will be able to occupy both and in the right centre.

In retrospect, we can see this kikashi made Black play , instead of , so providing White with an additional point of territory in the centre.

Capture Variation:

Compared to the superordinate variation ...

  • White gained an additional point of territory at the upper edge.
  • Black gained an additional three points of territory in the lower left corner.
  • White captured an additional Black stone at the upper edge, so gaining two points.
  • White got an additional point of territory in the right centre.

In total, Black lost one point.

White + 6 => White + 7

Semeai Variation:

Compared to the superordinate variation ...

  • White gained an additional point of territory at the upper edge.
  • Black gained an additional three points of territory in the lower left corner.
  • White captured one Black stone less at the upper edge, so losing two points.

In total, Black gained four points.

Jigo => Black + 4

Copyright © 2021 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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