:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (Ib)

KataGo's 2021 Solution

VAR

: ( 58ac)
Black closes one of the holes in his formation in the left centre, also occupying a liberty of White's large group at the left.

:
Now is it White, who takes profit outside the Main Semeai Area by connecting her single stone at the upper edge.

:
Black still has the sente push at the top.

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White gives atari at Black's stone in the lower right.

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Black is two over par with the Punishment Semeai Liberty Level, so KataGo connects here.

However, as far as the alternative Main Variation is concerned, it would have been better to play at in the left centre, instead, taking profit outside the Main Semeai Area.

:
White uses the wedge at to settle the shape in the left centre in sente.

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This is the final atari in that area.

:
The Main Semeai continues.

Black must not play any reduction.

Capture Variation:

Compared to the superordinate variation, ...

  • Black did not capture White's single stone at the upper edge, so losing one point.
  • White got an additional point of territory at the upper edge.
  • 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 + 2 => White + 2

Semeai Variation:

Compared to the superordinate variation, ...

  • Black did not capture White's single stone at the upper edge, so losing one point.
  • White got an additional point of territory at the upper edge.
  • White captured an additional Black stone in the lower right, so gaining two points.

In total, Black lost four points.

Black + 4 => Jigo

Copyright © 2021 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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