:: Igo Hatsuyôron 120 (2015)

Variations of Our Solution (I)

VAR

(Referenced by 38)


: ( 45)

Black separates White's groups in the centre in another way.

: (65 135)

White cannot cut at 65. However, that move deserves attention for a very different reason; it leads to a seki across half the board with a new type of seki, called Circular Hanezeki ( 799).

: (A 137)

The guzumi of , instead, does not work for Black as well.

: (A 138; 79 164)

Black follows our solution's path again.

Black might consider to try Joachim's ideas of playing the hiki at now, or of capturing White's left side with a move at 79, which both are explained in detail later for the first move ( 225), and for the second one ( 363), with played at 65, because his stone at (= here) may have hurt White's shape on the upper edge. However, these attempts will have been in vain.


But - after the hiki of - White will be forced to start the ko, which will arise in the top right, "early", so Black's move at might have some technical merits.

:

However, Black has no chance to pre-empt White's move at the guzumi point of .


So we now are in the path of the classical solution, in which White will gain an additional seven points of territory () in the upper right corner, compared to our solution. White will choose the Capture Variation, to realize her gain that is shown here, and to overcome Black's lead of five points in the Capture Variation of our solution successfully.

:

Here we show the resulting endgame on the left side, before White continues with the usual path with a move at . At the top, White has one point () more than usual, and Black has not captured one of White's stones at , but must connect there, instead. At the bottom, Black saves one of his stones (). White gets a total gain of one point on the left side.


In the Capture Variation, White's lead would increase by a further two points, because White captures an additional black stone () in the centre. In total, White will win this sub-variation by five points.

Copyright © 2020 Thomas Redecker.

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