:: Igo Hatsuyôron 120 (2022)

Timing of the Guzumi Without

Harry's Hasami-Tsuke Sequence (2022)

VAR (.1)

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Black plays my Guzumi.

We inserted this move manually.

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KataGo favours immediately blocking the path of the hanezeki's tail.

A komi of -1.5 was used in this self-play game.

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Black's push at has not yet been played, so KataGo prefers to play Harry's Hasami-Tsuke at immediately.

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White also immediately defends her upper right corner.

She does not play at before, but sacrifices her single stone.

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Black captures White's single stone.

Black has two options for a second eye ( and ), so his large group is securely alive.

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

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Black starts saving his nakade stones.

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White occupies a liberty of Black's nakade stones, ...

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... so allowing Black's atari at her four stones.

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As usual, Black ends in gote.

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

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Black blocks his upper left corner.

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White starts the encirclement of the potential territory at the top.

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White's atari will result in a ko-shape.

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White's capture starts a very short ko-fight.

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Black forces once at the upper edge, ...

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... before defending inside his upper left corner.

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White chooses this hasami-tsuke to further proceed into Black's corner.

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Black immobilises White's just played stone.

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White attacks Black's potential territory in the lower left corner, creating territory of her own in the process.

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Black extends to the right.

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White completes the Guzumi Exchange, forcing Black to capture her single stone in the left centre with .

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White takes profit at the lower edge.

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Black destroys some potential White territory at the top in return.

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

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White connects along the upper edge, ...

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... before saving her just played stone in the left centre, in sente.

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White stabilises her formation at the upper edge.

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The mutual reduction of opponent's territories continues at the bottom.


Ko: ;

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Black attaches in the centre.

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White wants to capture Black's single stone below.

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Black starts the ko-fight in the upper left.

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White saves her single stone at the upper edge, ...

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... in exchange for her two stones in the left centre.


Ko:

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White is forced to connect.

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Black can connect this stone to either side.

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


Ko:

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The small endgame continues, prolonged by a ko-capture from time to time.


Ko: ; ; ; ; ; ;

...


Ko: ;

...

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Black finally connects the ko.

...

Territory:

Black:

  • 18 points in the upper left corner.
  • Six points in the upper right.
  • Six points in the left centre.
  • Eight points in the lower left corner.

= 38 points in total.

White:

  • Two points in the hanezeki.
  • Two points at the left side.
  • Ten points at the lower edge.
  • 14 points at the top and in the centre.
  • Twelve points in the upper right corner.

= 40 points in total on the board.

White wins the game by three points.

Copyright © 2022 Thomas Redecker.

Design by Jan van Rongen, modified by Thomas Redecker.

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