DietersMistakesIn2021/Solution 58

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[Diagram]

Best

W2 is an example of surround in sente which is one of the patterns in this mistake analysis series. If B3 elsewhere, then W4 is big. Black can live but W8 takes 15 points in sente because of a.

[Diagram]

Sente

Compared to B3 answering locally, the difference goes up to more than 20 points, so that W2 can be considered sente.

[Diagram]

Mistake

W2 is premature. Black can break through the lines and there's bad aji at the marked point.


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