:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (IIIb)

Tricking KataGo (Triple-Ko)

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

: ( 222nw)
Black tries to improve his position for Joachim's Ko-Semeai that he intends to initiate.

However, as it will turn out, he has just taken himself a very decisive liberty.

: (113 222oc ;A 222oi)
White simplifies the matter by connecting at the upper edge, so frustrating the concept of Michael Redmond's kikashi.

Alternatively, she might consider occupying the guzumi point with .

Securing two eyes for her centre group with a move at , however, is a technical mistake - in principle. White will still be better than in the solution, but she will allow Black to establish a countable result of the game.

: (112 222oj ; 113 222ok)
Michael Redmond's kikashi in the bamboo joint comes too late now.

To be consistent with his original intention to arrange a ko fight, Black might connect at . But all his efforts will end in vain.

Playing the Guzumi Exchange before will not lead to success, either.

:
White cuts at the upper edge.
There is no need to defend with , or , instead.
Thereafter, White can also occupy Black's liberty at without any problem, because she could capture at if necessary.

:
Black plays the Guzumi Exchange, but to no effect here.
With no other potential approach-move liberty at his disposal, his large group does still have four liberties (, 3 x ) in the guzumi area.

:
White does not connect her two stones in the lower left, but continues with the Main Semeai, in order to keep Black's group below the Punishment Semeai Liberty Level.

At the moment of White's decision point, Black's large group will have only six direct liberties ().
White will choose the Capture Variation, and win the Punishment Semeai.

White will win the game by a large margin.

Copyright © 2021 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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