:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (IIIb)

Tricking KataGo (Triple-Ko)

VAR (C) (A) (.2) (.2) (.2)

: ( 222ij)
White jumps inside Black's upper left corner.

:
Black attaches from the left, denying White access to the corner.

:
White's push at the left edge is sente.

:
Thereafter, White connects her single stone in the right centre.

:
Black starts the reduction of White's territory at the top.

:
Black pre-empts a White atari at the same point.

:
White forces once in the corner, ...

:
... before occupying Black's last outside liberty.

:
Black is forced to play a defensive move inside his corner territory.

:
White continues with the usual sequence in the left centre.

Black plays 3/3 reductions.

Capture Variation:

Compared to the superordinate variation ...

  • White's cumulated gain in the upper left corner is two points.

Jigo => White + 2

Semeai Variation:

Compared to the superordinate variation ...

  • White's cumulated gain in the upper left corner is two points.
  • Black captured one White stone more at the left, so gaining two points.

In total, gains and losses compensate for each other.

Black + 3 => Black + 3

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