Sanrensei Fuseki / Review With AI

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San ren sei  

Playing on the side as early as move #5 is not the AI gospel. KataGo evaluates it as a 2% / 0.7 point loss. At the time of this review, this is considered to be in the margin of error of AI analysis, so we can't call the san ren sei bad.

Early 3-3 invasion  

It should come as no surprise that KataGo recommends W1, the early 3-3 invasion. Next B4 is a way to take sente and retaliate with B6. The particularity of the san ren sei doesn't have an apparent influence on KataGo's fuseki. It's early 3-3 all over again.

With LeelaZero it's a little different: she plays B6 at a


When suggesting the approach of W1 to KataGo, it brings about this sequence. White plays a conventional looking stabilizing move at a next.

This loses a marginal amount of points or percentage points with respect to the early 3-3.

LeelaZero ignores W1 to 3-3 the diagonally opposite corner. White will take sente to come back here and 3-3 at B6, now with support.

Pincer - 1  

If B1 pincers, White is happy (according to LeelaZero) to jump into the corner. W6 is notable. After W10, Black will play a, which is may adhere to the traditional framework building objective of the san ren sei.

Pincer - 2  

KataGo likes this variation a little better. After W10 (or even after W6), Black takes sente for invading at a. The idea of building a framework is abandoned.

San ren sei - approach inside  

On the other hand, an approach from the inside of the framework, loses about 1,5 points

Sanrensei Fuseki / Review With AI last edited by Dieter on June 18, 2020 - 10:01
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