Master Go In Ten Days/ Errata

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[Diagram]

Not joseki

Pg. 57, Diagram 3A shows this as a joseki, but actually playing the kosumitsuke of B2 is bad here, because W3 makes a perfect extension. This pattern would be possible if W1 were at b, so I think it's a typo. W1 in this diagram is also joseki, but here black would prefer to preserve the oppourtunity to invade a. So B2 can invade at a immediately or pincer at c. Calvin


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