:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (IIIb)

Tricking KataGo (Triple-Ko)

VAR (C) (A) (.2)

(Referenced by 222aa)


: ( 222an)
White plays Yamada Shinji's tsuke in the upper left corner.

: (146 222fx)
White draws back, as shown to us by Yamada Shinji.

Quite surprisingly, KataGo's immediate crosscut with , which can be played so successfully "early", is out of the question here in the "late" endgame.

: (147 222fz)
White's cut is essential.

If White did without, and solidly connects at , instead, she would lose one point overall.

: (149 222ga)
White captures Black's stone at the upper edge.

Extending into Black's corner with , instead, will not work here, as there are no Black weaknesses left that White could exploit successfully.

:
White continues with the known endgame sequence at the left.

:
Please note that Black ends in gote here.

White will use her sente in the Capture Variation (after the dissolving of the hanezeki) to occupy the point of .
She will play this move at the beginning of the Semeai Variation.

Capture Variation:

Compared to the superordinate variation ...

  • White's cumulated gain in the upper right corner is one point.
  • White got an additional point of territory in the centre.

In total, White gained two points.

White + 2 => White + 4

Semeai Variation:

Compared to the superordinate variation ...

  • White's cumulated gain in the upper right corner is one point.

Black + 4 => Black + 3



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