:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (IIIb)

Tricking KataGo (Triple-Ko)

VAR (C) (A) (.2) (.2)

: ( 222gh)
Black connects solidly, closing the border of his upper left corner to the top.

:
White captures at the bottom, in sente.


: ( A 222ik ;  113 222iq ; B 222ir)
The hasami-tsuke at the left edge is one of White's options here.

However, it would have been better for her to either push with at the left edge, or to jump into Black's corner with .

Immediately connecting her single stone at the right with , instead, would not affect the outcome of the game.

:
White plays KataGo's bad shape move in the left centre.

:
Black inserts the atari in the lower left as a kikashi.

:
White connects her single stone in the upper right, so stopping Black from capturing it.

:
White plays the remaining endgame at the top "early".

Black plays 3/3 reductions.

Capture Variation:

Compared to the superordinate variation ...

  • Black's cumulated gain in the upper left corner is two points.
  • White captured Black's stone in the lower left, so gaining two points.
  • At the top, one point of White's territory changed place, so the net effect is zero.
  • Black destroyed one point of White's territory in the right centre.

In total, Black gained one point.

White + 1 => Jigo

Semeai Variation:

Compared to the superordinate variation ...

  • Black's cumulated gain in the upper left corner is two points.
  • White captured Black's stone in the lower left, so gaining two points.
  • At the top, one point of White's territory changed place, so the net effect is zero.
  • Black captured one White stone less at the left, so losing two points.
  • White captured one Black stone more in the right centre, so gaining one point.
  • White lost one point of territory in the upper right corner.

In total, Black lost two points.

Black + 5 => Black + 3

Copyright © 2021 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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