:: Igo Hatsuyôron 120 (2022)

Timing of the Guzumi Without

Harry's Hasami-Tsuke Sequence (2022)

VAR

: ( 1863)
Black plays my Guzumi.

We inserted this move manually.

:
White attacks Black's potential territory in the lower left corner.

This move also ensures that White's potential eye space at the bottom is now large enough for independent living.

:
Black plays Harry's Hasami-Tsuke immediately.

He does neither precede it with the "classical" push at nor does he secure immediate life for his large group by capturing White's single stone at the right with , instead.

:
White pulls her hasami-tsuke stone out.

:
White makes sure that her stones at the left cannot be captured easily.

:
Black starts saving his nakade stones.

:
Black ends in gote in the lower left, of course.

:
White continues at the upper edge, capturing Black's single stone there.

:
Black blocks his upper left corner.

:
White connects her two stones in atari, ...

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... forcing Black to to capture her single stone in the upper right, securing independent life for his large group.

:
White blocks at the top.

:
Black plays a kikashi at the bottom, ...

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... before settling the shape in the upper right corner.

:
Black takes territory in his lower left corner.

:
White's attachment in the left centre threatens to capture Black's two stones to the left.

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Black captures at the bottom.

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Black sacrifices his two stones to the left, in order to massively enhance his position in the centre.

:
White's atari in the Guzumi Area could be played at any time, in principle.

:
Black proceeds further into White's potential territory at the top.

:
KataGo starts one of its surprising attacks inside Black's upper left corner, which will result in a ko-fight.

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White owns the corner now.

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Black's hane at the upper edge reduces the size of White's potential eye.

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Black's oki is mandatory.

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White must not let Black occupy this point, as this would result in a massive reduction of her group's liberties.

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Black has to occupy the other 1-2-point.

:
White is able to capture Black's earlier played stone at the upper edge, threatening to connect to her allies at the top.


Ko:

:
Black has to intercept.

:
White destroys Black's potential eye.

:
Black starts the ko-fight in his upper left corner, which he must win, as his corner group is eyeless.


Ko: ; ; ; ;

:
The ko-fight continues.


Ko: ;

:
Black erases White's ko-threat at this point.

:
White occupies an outside liberty of Black's corner group.

:
Black utilises the mutual occupation of opponent's liberties in the corner semeai as a ko-threat.

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Finally, White gives atari at Black's five stones in the upper right.

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Black has run out of valid ko-threats, so he terminates the ko-fight in the upper left by capturing White's single stone at the upper edge.

:
Black secures territory in the centre, capturing White's single stone there.

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Thereafter, Black reduces White's potential at the top from either side.

:
The small endgame continues.

Territory:

Black:

  • 20 points in the upper left corner.
  • Six points in the upper right.
  • Six points in the left centre.
  • 19 points in the lower left corner.

= 51 points in total.

White:

  • Two points in the hanezeki.
  • Nine points at the left side.
  • Seven points at the lower edge.
  • 13 points at the top and in the centre.
  • 21 points in the upper right corner.

= 52 points in total on the board.

White wins the game by two points.

Copyright © 2022 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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