:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (Ib)

KataGo's 2021 Solution

VAR (.3) (.3)

: ( 58bc)
Black blocks in the lower left corner.

:
White pushes at the left edge.

:
Black connects.

:
White pushes for another time into Black's upper left corner.

:
Black blocks.

:
White's hane at the upper edge is sente.

:
Black has to add a protective move inside his corner.

:
White plays KataGo's bad-shape move in the left centre.

:
Black captures White's single stone in the right centre in return.

: (144 58bp)
White plays the central attachment in the left centre.

She might consider playing the atekomi of , instead. But her hope of entering a successful Dany's Ko will end in a loss of two points in the Semeai Variation.

:
Black maximises his territory in the lower left corner.

; :
White forces twice in the lower left corner, ...

:
... before establishing two points of territory in the right centre.

Black plays 5/5 reductions.

Before the end of the game, Black must defend at .

Capture Variation:

Compared to the super²ordinate variation, ...

  • White's cumulated gain in the upper left corner is one point.
  • White's cumulated gain in the left centre is five points.
  • White's cumulated gain in the lower left corner is one point.
  • Black destroyed three points of White's territory in the upper right.
  • Black captured White's single stone in the right centre, so gaining two points.
  • White did not capture Black's stone in the lower right, so losing two points.

In total, gains and losses compensate for each other.

White + 1 => White + 1

Semeai Variation:

Compared to the super²ordinate variation, ...

  • Black's cumulated gain in the upper left corner is one point.
  • White's cumulated gain in the left centre is five points.
  • Black's cumulated gain in the lower left corner is one point.
  • White captured three Black stones more in the upper right, so gaining three points.
  • White captured one Black stone more in the lower right, so gaining two points.

In total, Black lost eight points.

Black + 7 => White + 1

Copyright © 2021 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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