: ( 2025)
KataGo favours Harry's Hasami-Tsuke.

Please emember that KataGo will have already exchanged for much earlier in the game.

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White exchanges for , as usual.

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After that, however, White immediately connects with .

Continuing with the "usual" attachment at would be mistaken here.
Black would utilise Michael Redmond's Kikashi in the Bamboo Joint, so gaining decisively overall.

Should Black have played Harry's Hasami-Tsuke Sequence earlier (then with instead of ), White would have to exchange the peep for Black's connection before she occupied the Guzumi Point with .

Please note that the reduction of White's upper right corner territory ends in sente for Black, which - according to KataGo - seems to be worth one point overall.

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Black is forced to follow White with the Main Semeai.

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As a matter of course, KataGo favoured the continuation with Yamada Shinji's Tsuke in the upper left corner.

We manually enforced Fujisawa Hideyuki's Atari .

Here, with Harry's Hasami-Tsuke utilised for the reduction of her upper right corner, White is unable to delay Fujisawa Hideyuki's Atari until after her decision point. Black would win the game by two points.

Please note that this behaviour is contrary to that with Fujisawa Hideyuki's way to reduce Black's upper right corner.

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This astonishing kikashi in the upper left centre can be often seen in KataGo's games.

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Black is forced to answer from above, in order to erase his potential shortage of liberties after , , .

White's kikashi creates a weakness at in Black's formation that White might be able to exploit for a one-point gain unter special circumstances after the standard exchange of for .

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Please remember that Black is unable to connect his pivotal hasami-tsuke stone.

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White erases her remaining weakness in the Guzumi Area.

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White plays the hane at the upper left edge.

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KataGo captures Black's single stone immediately.

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Black will be unable to benefit from starting a ko-fight with , so he simplifies the issue by connecting at .

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White's hasami-tsuke starts the reduction of Black's lower left corner territory.

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Black connects here.

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White's kikashi fixes the borders in the upper left.

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The Main Semeai continues.

Black must not play any reduction.

After White's decision point, White will play at in the right centre. Black will defend his weakness in the left centre with KataGo's Solid Connection at , whereafter White will connect th ko at at the upper edge.

Capture Variation:

Compared to the superordinate variation, ...

• Black got an additional point of territory in the upper left corner.
• White did not capture Black's stone in the lower left, so losing two points.
• In the upper right corner, White captured an additional Black stone, but lost two points of territory, so the net effect is zero.
• White got an additional three points of territory in the Guzumi Area.

In total, gains and losses compensate for each other.

White + 2 => White + 2

This final score is one point better for Black, compared to Fujisawa Hideyuki's classical way of reducing White's upper right corner territory.

Semeai Variation:

Compared to the superordinate variation, ...

• Black got an additional point of territory in the upper left corner.
• White did not capture Black's stone in the lower left, so losing two points.
• Black destroyed two points of White's territory in the upper right corner.
• White got an additional three points of territory in the Guzumi Area.
• White captured two Black stones less in the upper right, so losing four points.
• White got an additional point of territory in the hanezeki.

In total, Black gained three points.

White + 1 => Black + 2

2025