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Six-space Extension Test
    Keywords: Opening

Bill: I was taught that 5 spaces was the limit for an extension, because a longer extension left enough room for the opponent to make a normal extension inside. I was also taught that if you extend from a wall of height, H, you can extend H + 1 spaces.

There is not really a conflict here, because the first piece of advice is about extending from 1 stone, and the second is about making a secure base.

However, it does lead to a question:

[Diagram]
6-space extension test

Can White make a successful invasion, either splitting Black in two or making life inside?

Charles Matthews Cf. game 2 of the 1975 Oza final, Ishida Yoshio-Otake Hideo. But after looking at that game, I'm not sure I'd want to give a one-sentence answer. Perhaps it can be said that BC takes up position correctly on the side, but Black's formation is a little loose.



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