:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (IIIb)

Tricking KataGo (Triple-Ko)

VAR (C) (A) (.2)

: ( 222an)
Black plays Michael Redmond's kikashi in the bamboo joint.

: (A 222ap)
White has to answer with the solid connection, in order to not lose a tempo in the Main Semeai.

Please note Black's upper left corner is still untouched.
If White played the atari of , instead, Black would take the large endgame point of , defending his territory in that area.

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

: (B 222aq ;  C 222bb)
White continues with the Main Semai by occupying one of Black's liberties in the guzumi area.

White might want to start the endgame early, instead. If she did, choosing Yamada Shinji's tsuke would be better than playing the "classical" atari .
During the endgame at the left side, Black can use his sacrifice at the lower edge only once. Either could he capture White's two stones in the lower left, or use his tenuki for getting a profitable move in the upper left corner - but not both.

However, the final scores of the game will not be affected by White's timing of starting the endgame just now. Therefore, it may be more comfortable for her to start the endgame only two moves later, in order to avoid complications.

A move at , instead, frustrating Black's hopes on a semeai with White's centre group, would be one point worse overall, due to the then remaining weakness in the guzumi area.

: (E 222eq)
Black captures White's two stones in the lower left.

Black might consider defending his territory in the left centre with a move at , instead. Choosing this alternative line of play will result in unchanged final scores of the game.

: (B 222et ;  C 222ev)
White captures the nakade at the left edge, following the "classical" line of play with White starting the endgame at the left side of the board after her decision point.

However, she might want to start the endgame at the left side of the board "early", as long as Black's upper left corner is still open at both edges, and the left centre is also still untouched.

///:

This is the position at White's decision point.
In order to simplify the presentation for a "late" endgame, we display this before the dissolving of the hanezeki.

Please note that - in the initial stages of our investigation of this "classical" line of play without Black's guzumi - we were not yet aware of all the so far hidden weaknesses of both sides.

: ( 143 222ft)
We start with White's "classical" atari at Black's single stone at the top.

As we know for long, playing Yamada Shinji's tsuke at would be preferable.

...

Capture Variation:

Compared to the superordinate variation ...

  • Black's cumulated gain in the upper right corner is four points.
  • White got an additional point of territory in the centre.

In total, Black gained three points.

White + 2 => Black + 1

Semeai Variation:

Compared to the superordinate variation ...

  • Black destroyed two points of White's territory in the upper right corner.
  • White captured an additional Black stone there, so gaining two points.

In total, gains and losses compensate for each other.

Black + 4 => Black + 4

Copyright © 2021 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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