:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (IIIb)

Tricking KataGo (Triple-Ko)

VAR (C) (A) (.2)

: ( 222fu)
Black gives atari at White's pivotal stone.

:
White gives counter-atari.

:
It is best for Black to connect.

:
White gives another atari in the corner.

:
Black captures.

:
White forces once in the corner, ...

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... before separating Black's troops.

:
White's diagonal move at the upper edge threatens to start a ko fight with .

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Black's atari prevents this.

:
White attacks Black's stones below.

:
Black has to capture at the upper edge.

:
White connects her stones.

Please note that White's atari at the left edge is not sente here; Black would give atari at .

:
Black occupies the miai point.
The position in the corner is me-are-me-nashi now.

:
White forces for another time in the corner, but she does not have any continuation there.

:
White continues with the endgame in the lower left corner.

:
It is best for Black to connect.

:
Black has to immobilise White's stones in the corner.

If Black did without this move, White would descent to this point. After , , , the corner would have become a seki, so White would win the game again.

Capture Variation:

Compared to the superordinate variation ...

  • Black's cumulated gain in the upper left corner is one point.
  • Black's cumulated gain at the upper edge is eight points.
  • Black did not destroy two points of White's territory at the top
  • White did not capture Black's stone in the lower left, so losing two points.

In total, Black gained nine points.

White + 3 => Black + 6

Semeai Variation:

Compared to the superordinate variation ...

  • Black's cumulated gain in the upper left corner is one point.
  • Black's cumulated gain at the upper edge is eight points.
  • Black did not destroy two points of White's territory at the top
  • White did not capture Black's stone in the lower left, so losing two points.

In total, Black gained nine points.

Jigo => Black + 9

Copyright © 2021 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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