:: Igo Hatsuyôron 120 (2021)

Variations of Our Solution (IIIb)

Tricking KataGo (Triple-Ko)

VAR (C) (A)

: ( 222jp)
Black's atari at White's two stones in the lower left is played too early.

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White connects her single stone in the upper left corner in sente.

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Black has to defend against White's throw-in at this point.

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White's push at the left edge destroys two points of Black's territory, without losing a tempo in the Main Semeai.

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Black takes the opportunity to capture White's two stones in the lower left.

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White defends her weakness in the upper right.

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Black continues with the Main Semeai.
He has to play this protective move before approaching White's last liberty in his corner.

:
White starts the endgame in the lower left corner.

She could also play the sequence from to in the left centre first.

Please refer to the next but one subvariation ( 222jt) for a detailed explanation of the correct order of moves in the endgame on the left side of the board.

:
Black connects.

Alternatively, he might consider descending to at the upper edge. The final scores of the game would not be affected.

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Now, White can play the wedge in the left centre.

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This is KataGo's bad-shape move.

:
Black answers with KataGo's solid connection.

Alternatively, he might consider descending to at the upper edge. The final scores of the game would not be affected.

Black must not play any reduction.

After her decision point, White will play the hane at and connect at thereafter.
Black will have to connect at before the end of the game.

Capture Variation:

Compared to the superordinate variation ...

  • White destroyed three points of Black's territory in the upper left corner.
  • White's cumulated gain in the left centre is one point.

In total, White gained three points.

White + 3 => White + 6

Semeai Variation:

Compared to the superordinate variation ...

  • White destroyed three points of Black's territory in the upper left corner.
  • White's cumulated gain in the left centre is one point.
  • Black captured two White stones more at the left, so gaining four points.

In total, White lost one point.

Jigo => Black + 1

Copyright © 2021 Thomas Redecker.

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