:: Igo Hatsuyôron 120 (2022)

New Story Line 2022

Joachim's Hiki at the Upper Edge

(Joachim's Ko-Semeai #1)

VAR

: ( 2034)
White plays a solid connection at the upper edge.

It will result an approach-move ko in the upper left corner, which KataGo apparently better understands than the formation with three ko-shapes in the superordinate variation.

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Black's hane at the upper edge creates some difficulties in approaching his corner group.

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White prevents Black's connection along the upper edge, also occupying a liberty of Black's large group in the upper right.

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Initiating the Guzumi Exchange provides Black with an additional Main Semeai Liberty, making up for the corresponding loss due to .

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Black returns to the upper left corner, again losing a tempo in the Main Semeai.

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White captures the nakade.

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It is not necessary for White to split the Nakade Sequence here in this subvariation.


Ko:

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Black starts the ko-fight in the upper left corner.

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Black is not in a position to play any moves other than those of the Main Semeai.

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White plays a kikashi in the upper left corner, ...

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... before also continuing with the Main Semeai, while erasing Black's potential ko-threats at the right side of the board.

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The time has come to occupy an outside liberty of Black's corner group.


Ko: ;

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Black restarts the ko-fight.

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Black erases several White ko-threats in the left centre.

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White occupies another outside liberty of Black's group.

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Finally, White captures the hanezeki's tail.

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Black must recapture.


Ko:

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White recaptures the ko.

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Black erases White ko-threats again.

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White occupies the last but one outside liberty of Black's corner group, turning the ko-fight into a direct one.

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Black cannot erase this White ko-threat.

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Black does not have any adequate ko-threat left.

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White captures Black's group in the upper left corner, so ending the ko-fight.

White will win the game by a large margin

2034

Copyright © 2022 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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