Flying knife joseki

   
[Diagram]
Flying Knife (Inside Cut)  

Overview

A complicated joseki. It might also be referred to as the "3-3 push and cut" or "3-3 taisha". Semantically, it could be regarded as beginning with B3 in the diagram, but up to B5 is forced in competent play. White can avoid the flying knife by playing W2 as the hiki back to d, or else by playing W2 immediately without exchanging the attachment.

This joseki emerged from research with / from computer programs, during and following the AI revolution. Top professional Mi Yuting was apparently an early adopter, since the original name of the sequence was "Mi Yuting's flying knife" or "Mi Yuting's flying dagger", that term indicating a secret weapon (in Go theory) in Chinese. [1]

[1] This is something I (bugcat) have been told, but haven't checked for myself or read from any official source.

Resources

More information on the joseki can be found here. You can also research the position for yourself with [ext] this Waltheri search link. However, note that Waltheri hasn't been updated since March 2020, and many innovations in the flying knife have occurred since then. See also [ext] its page on the OJE (OGS Joseki Explorer) for more curated and perhaps more up to date explanation.

Yeonwoo covered the topic from [ext] from 11:13 to 14:42 in her November 2019 Youtube lecture Let's conquer 3-3 invasion!, with a discussion of how to avoid it continuing to 15:18.

The L19 thread [ext] Flying dagger tesujis, from January 2021, provides "an exploration of a few of the more surprising tactics".

Popularity

In 2019, [ext] a study found that the flying knife was the ninth most popular joseki of that year, appearing once in every nineteen professional games (from the beginning of 2019 to 2019-11-21). However, the database used was never mentioned. In September 2020, the author said that it was "probably more common than 1 in 10 games in 2020."

Waltheri's statistics say that it was played once in 2016, 41 times in 2017, and 204 times in 2018.

"Baiting"

When a stronger player is playing against a weaker one, he may try to push Black around a little by offering to enter the knife. If Black refuses to do so then he will usually end up playing this joseki, sometimes called the "old hane wall" or "hane wall mark II" (to distinguish it from the pre-bot one with the hanetsugi).

Despite being a hypermodern joseki, it's fallen out of favour in recent years due to Black losing sente and being burdened by the peep at a. To make Black play this way can be an aim of the attachment. However, Black does have the option of playing B4 without the B2 -- W3 exchange. Another way for him to avoid complications is to play B2 at W5 but, after White responding at W2, cover at b instead of drawing back to c.

[Diagram]
 

Flying knife joseki last edited by bugcat on January 17, 2022 - 12:17
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