:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (IIIb)

Tricking KataGo (Triple-Ko)

VAR (C) (A)

: ( 222aa)
White draws back to capture Black's single stone at the top.

However, this move is too soft with regard to Black's upper left corner.

:
Black takes the opportunity to play the guzumi.

: ( A 222gg ; 106 222gh)
White starts reducing Black's territory in the upper left.

Alternatively, she might consider crosscutting at .

Immediately completing the Guzumi Exchange with will allow us to examine the variation tree for Yamada Shinji's tsuke in the upper left corner with Guzumi Exchange, what we had not done yet in the context of KataGo's new moves.

: ( A 222it)
White pushes into Black's corner.

However, this is the latest moment when White must play the crosscut at , instead.

:
Finally, she completes the Guzumi Exchange.

:
Black continues with the endgame in the lower left corner with this large descent to the lower edge.

:
White secures her territory at the top in sente.

:
This is KataGo's bad-shape move in the left centre.

:
Black must defend this cutting point.

:
White could also do without this push that costs her one tempo in the Main Semeai.

Black plays 3/3 reductions.

Capture Variation:

Compared to the super²ordinate variation ...

  • Black's cumulated loss in the upper left corner is four points.
  • White got an additional two points of territory at the top.
  • Black's cumulated gain in the upper right corner is seven points.
  • White destroyed two points of Black's territory in the left centre.
  • Black's cumulated gain at the lower edge is five points.
  • White's cumulated gain in the lower left is six points.
  • Black destroyed one point of White's territory in the centre.
  • White captured two Black stones less at the right, so losing four points.

In total, White lost one point.

White + 2 => White + 1

Semeai Variation:

Compared to the super²ordinate variation ...

  • Black's cumulated loss in the upper left corner is four points.
  • White got an additional two points of territory at the top.
  • Black destroyed four points of White's territory in the upper right corner.
  • Black's cumulated gain in the left centre is two points.
  • Black's cumulated gain at the lower edge is five points.
  • Black's cumulated gain in the lower left is two points.
  • Black destroyed two points of White's territory in the centre.
  • White captured four Black stones more at the right, so gaining eight points.

In total, White lost one point.

Black + 3 => Black + 4

Copyright © 2021 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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