:: Igo Hatsuyôron 120 (2022)

Tenuki Variations After my Guzumi (2022)

VAR (.B)

: ( 1432)
White plays Yamada Shinji's Tsuke.

We inserted this move manually.

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Black strengthens his formation in the left centre.

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White completes the Guzumi Exchange.

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Black is forced to continue with the Crosscut Sequence in the left centre.

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KataGo starts one of its astonishing attacks on Black's upper left corner.

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Black tries to keep his troops connected.

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White gives atari at Black's single stone.

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Black attacks White's invading stones, as he is unable to connect at .

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Black solidly connects his stones in the upper left corner.

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White plays a kikashi, ...

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... before securing independent life for her bottom group with the usual descent to the lower edge.

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Black is forced to do the same for his large group in the upper right.

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White captures Black's single stone in the left centre, connecting her left-hand group to the top.

White lost a decisive liberty through Black's earlier move at , thus she cannot hope on the Main Semeai any longer.

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Black captures two White stones in the upper right corner, securing his first eye.

The points of and are miai for the second one.

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White's atari continues the semeai in the upper left corner.

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Black connects immediately.

It does not make sense to start a ko-fight with giving counter-atari at , instead.

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White aims for the largest possible eye space for her group.

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Black's hane at the upper edge is the first step for its reduction.

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Black prevents White from creating two eyes for her group, also reducing the number of its internal liberties.

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White captures Black's single stone at the upper edge, so creating some difficulties for Black to approach her corner group from this direction.

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Black must capture White's pivotal tsuke stone.

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White sacrifies a second stone, in order to create a ko-shape in the corner.

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This is an example of a potential ko-threat played before the start of the ko-fight, typical for KataGo as an AI programme.

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Black continues the semeai from the inside.

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White rescues some of her stones at the lower left side.

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Black captures White's two stones in the upper right, so erasing a potential White ko-threat.

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White captures Black's nakade stones.

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Black continues with the semeai in the upper left corner.

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White recaptures.

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White will be unable to win the approach-move ko in the upper left corner, so she starts the endgame.


Ko: ; ; ; ; ;

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Black captures the ko in the upper left corner.

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The ensuing endgame is prolonged by the mutual recapturing into the ko.

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Finally, Black captures White's invading group.

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The small endgame continues.

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A kikashi typical for KataGo.


Ko: ;

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KataGo starts a superfluous ko-fight here.

Black's territory:

  • Upper left corner: 22 points (net).
  • Left centre: 4 points.
  • Lower left corner: 9 points.
  • Upper right corner: 11 points.

= 46 points of territory in total.

White's territory:

  • Hanezeki: 2 points.
  • Bottom: 6 points.
  • Top and centre: 8 points.
  • Upper right corner: 7 points.
  • Nakade Area: 12 points.

= 37 points of territory in total on the board.

Black wins the game by eight points.

Copyright © 2022 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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