:: Igo Hatsuyôron 120 (2022)

Timing of the Guzumi Without

Harry's Hasami-Tsuke Sequence (2022)

VAR

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White blocks the corner.

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Black starts the Nakade Sequence.

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KataGo likes to play this kikashi in the left centre.

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Thereafter, White follows the solution sequence for a while.

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Black must defend his lower left corner.

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White takes the opportunity to occupy the Guzumi Point.

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Black gives atari at White's two stones in the lower left.

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White does not connect her two stones, but continues with the Tsuke of Yamada Shinji.

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White erases a hidden weakness in the Guzumi Area.

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Black captures White's two stones in the lower left.

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White draws back in the upper left corner, capturing Black's single stone.

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Black gives atari at the upper edge.

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White exchanges one move in the Main Semeai, ...

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... before continuing the endgame on the left side with her hasami-tsuke in the lower left corner.

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White starts the mutual occupation of opponent's liberties in the Main Semei.

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White gives atari at Black's two stones in the upper right corner.

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Black pushes once into White's territory at the top, in sente.

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Black is unable to connect his two stones, as this would lose two Main Semeai Liberties, which is one too many.

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Finally, Black captures White's single stone at the upper edge.

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We simplified the last moves of the game.

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Black gives atari at White's left-hand group.

White will capture at , choosing the Capture Variation, and later play at in the right centre. Black will connect at at the upper edge.

Capture Variation:

Compared to the super²ordinate variation, ...

  • Black's cumulated gain in the upper left corner is five points.
  • Black's cumulated gain at the top is two points.
  • White did not capture one Black stone in the left centre, so losing one point.
  • White's cumulated gain in the lower left corner is five points.
  • White's cumulated gain in the upper right corner is three points.

In total, White lost one point.

White + 5 => White + 4

Semeai Variation:

Compared to the super²ordinate variation, ...

  • Black's cumulated gain in the upper left corner is five points.
  • Black's cumulated gain at the top is two points.
  • White did not capture one Black stone in the left centre, so losing one point.
  • White's cumulated gain in the lower left corner is five points.
  • Black's cumulated gain in the upper right corner is one point.
  • Black captured one White stone less in the left centre, so losing two points.

In total, White lost three points.

Jigo => Black + 3

Copyright © 2022 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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