100ChallengingGoProblemsFor100DaysOfStudy/Problem 32

[Diagram]

Problem

White to play in this position where Black has numerical superiority.

Clearly we're looking at a way to capture the marked cutting stone or otherwise make shape by using that potential.

A is an obvious ladder breaker but likely not the tesuji we're looking for. Also, Black can probably safely ignore

[Diagram]

Tesuji

Marvelous move! W11 is at A so that Black has to either allow a ponnuki at B or a capture at C

[Diagram]

Alternative

The difference with my choice is that W3 is much more devastating if Black reinforces at B2.

KataGo comes up with this sequence. The idea is similar: if B8 continues the ladder, White will cut off B5 & B6.

Next W11 continues at A.

[Diagram]

KataGo (1)

KataGo needs to be fed the tesuji in order to appreciate it at fewer playouts. It then offers B2 as a resistance. White now continues with W5 or A. This situation requires many more playouts.


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