Tewari Example 5

  Difficulty: Advanced   Keywords: Strategy, Theory, Go term

From this [ext] Asahi newspaper site. Black played B1 - B3, allowing White to play the big point at W4.

Ishida Akira, commenting on the game, said that if Black had not played B1, but had taken a big point himself, for White to play at 1 would have been absolute. He appealed to the following tewari diagram.

[Diagram]

Tewari

In this position the exchange, B1 - W2, is bad for Black.

This example is also present in Ishida Yoshio's Dictionary of Basic Joseki, vol.3.



LZ analysis

This section used to be headed "LZ does not agree with Ishida's analysis". But Ishida does not say that B1 above is the best move! Ishida's analysis is: if black doesn't play at the top left, then white should play at the point of B1. Leela Zero does agree with that part. Specifically, if B1 is at W4, then W2 at B1 is rated as one of several equally good options. KataGo supports the same conclusion.

[Diagram]

Leela Zero's analysis

Before B1, LZ estimates Black's chances at 40%. After this exchange they drop to 30%. Most likely this is because Black sacrifices the corner, while living there is more to LZ's liking.

[Diagram]

Leela Zero's preference

LZ wants to force at B1 first, then make sabaki in the corner

[Diagram]

Leela Zero's preference (ctd)

And then it unfolds like this.


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