:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (IIIb)

Tricking KataGo (Triple-Ko)

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

: ( 222gh)
Black follows the original sequence.

:
White cuts in the corner.

: (A 222gn)
Black has to give atari at White's just played stone.

Black must not give atari at White's two stones at the top, instead, mistakenly hoping that White will capture at .
White will take him by surprise, and start a severe attack on his upper left corner.

Please note that this is the move that leads to the aforementioned analysis of Yamada Shinji's tsuke.

:
White forces at the upper edge, ...

:
... before giving atari at Black's two stones.

:
Black takes the opportunity to occupy the large endgame point at the lower edge.

:
Black gives atari at the upper edge.

He would lose one point overall, if he immediately recaptured at , instead.

:
White connects her two stones, as there are no other larger endgame points remaining.

:
Black is able to capture White's single stone in the right centre.

Black plays 3/3 reductions.

The final scores of both Main Variations will be the same, so Black needed to play his kikashi in the hanezeki earlier in the game (displayed here for the clarity of the presentation).

Capture Variation:

Compared to the superordinate variation ...

  • White's cumulated gain in the upper left corner, and at the upper edge, is nine points.
  • Black got an additional three points of territory in the lower left corner.
  • Black's cumulated gain in the upper right is four points.

In total, White gained two points.

White + 1 => White + 3

Semeai Variation:

Compared to the superordinate variation ...

  • White's cumulated gain in the upper left corner, and at the upper edge, is nine points.
  • Black got an additional three points of territory in the lower left corner.
  • White's cumulated gain in the upper right is two points.

In total, White gained eight points.

Black + 5 => White + 3

Copyright © 2021 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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