:: Igo Hatsuyôron 120 (2020)

Variations of Our Solution (IIIa)

No Early Kikashi

VAR (.4) (.2)

: ( 648hm)
White plays Dany's atekomi.

Please note that this move is played outside the Main Semeai area, and so loses a tempo therein.
Contrary to other variations, where White played the wedge in the left centre, an approach-move liberty of White's left-hand group is not created here.

:
White intends to start Dany's ko here.

However, we will see later that starting a ko fight here does not really make sense. White will be worse in the Semeai Variation, if she connected the ko. Therefore, she might simplify the issue by connecting at .

:
Black takes the large point in the upper right.

In principle, Black loses two Main Semeai Liberties by this move. But becomes an approach-move liberty of his group, so the net effect of this move is a loss of one Main Semeai Liberty.

:
White plays her kikashi in the lower left corner.

: (A 648hy)
Black answers White's forcing move in the lower left corner.

He might connect at immediately, instead.

:
White throws-in in sente.

:
Black connects below.

White's throw-in is also an atari, so it does not make sense to fight a ko by capturing at , instead.

:
White connects her single stone at the upper edge.

:
Black plays his remaining kikashi

:
White connects her two stones.

She would lose one point overall, if she chose Dany's Sacrifice, instead.

:
White has to connect the ko - sooner or later.

She would be worse overall, if she allowed Black to capture and connect, instead.

Black plays 4/6 reductions.

White will insert the forcing sequence from to soon, so that Black will have to capture with before the end of the game.

Capture Variation:

Compared to the superordinate variation ...

  • Black destroyed an additional point of White's territory at the top.

White lost one point.

White + 2 => White + 1

Semeai Variation:

At White's decision point, Black's large group in the upper right will have nine liberties, eight direct ones (), and one approach-move liberty ().
White on her side will suffer from the final ko in the upper right centre - found by Joachim ( 648ag) - that depends on the existence of two White cutting points in the centre (), and Black's large ko threat at at the top.
Black's large group in the upper right will not survive the semeai, but Black will capture White's wC-stones in the upper left, and win by about 15 points.

Black will win the game by a large margin.

Copyright © 2020 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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