:: Igo Hatsuyôron 120 (2020)

Variations of Our Solution (IIIa)

No Early Kikashi

VAR (.1)

: ( 648mk)
White recaptures the ko.

In this subvariation - in order to analyse Dany's suggestion - we will assume that White intends to utilise the connection at at the left edge strictly as a ko threat, i.e. that she would play it only after Black recaptured the ko in the centre with a move at .

Please note that we will not update the board's border colour in this subvariation, just because the "usual" Main Semeai will not become effective.

:
Black connects his two stones at the left immediately.

:
It is best for White to connect her single stone at the upper edge, if she does not want to continue with the interrupted nakade sequence.

:
Black plays his kikashi at the top, before ...

:
... he throws-in in the nakade, instead of re-capturing the ko in the centre with .
Due to this move, White suffers a decisive loss of points, as well as of Main Semeai Liberties, because she now lacks the capture of a five-stone shape during the process of reducing the nakade.

:
White has to capture immediately.

Otherwise, would reduce the size of her eye shape at the left any further.

:
Black connects, no longer fighting Dany's Ko.

In order to simplify the presentation in this subvariation, we will assume that Black does not want to recapture the ko with even later.

; : ( 148 648nb)
We will first concentrate on points, i.e. the best sequence for later choosing the Capture Variation:
White plays her kikashi in the lower left corner.

We will second concentrate on liberties, i.e. the best sequence for later choosing the Semeai Variation:

:
White connects her three stones in atari.

Black plays 4/7 reductions.

If Black played 7/7 reductions, the final scores would become Black + 6 / White + 2

White will connect at after her decision point.
Before the end of the game, Black will have to capture at .

Capture Variation:

Compared to the superordinate variation ...

  • White did not capture Black's five-point nakade, so losing five points.
  • White captured on Black stone in the lower left, so gaining one point.
  • Black did not destroy two points of White's territory at the top.
  • White did not destroy one point of Black's territory in the upper left corner.
  • White did not capture Black's stone in the lower right, so losing two points.

In total, White lost five points.

White + 2 => Black + 3

((Semeai Variation:))

At White's decision point, Black's large group in the upper right will have ten liberties, nine direct liberties (), and one approach-move liberty (), so White will be unable to capture it.

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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