Bill Spight wrote:
what about extensions from walls in general?
My book (p. 233+) gives this general principle for the gap between wall and extension: "First determine the farthest extension that is also a connection, which might be direct or indirect. This must be verified by reading. Then consider also alternatives."
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If a wall is strong enough, it does not need an extension. But if you do not extend, how do you make use of it?
It depends on the global positional context. Possible usages include:
- Extend later.
- Build more walls later to create moyo / territory.
- Attack opposing stones while exposing them to the wall.
- Watch while the opponent defends more timidly than without the wall's presence.
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Often pros make extensions that are longer than the proverb says. What is going on there?
Suppose they have an implicit understanding of my principle. Then obviously there must be additional reason for playing a not connected extension, e.g.,
- Building a moyo.
- Inviting an invasion.
- Playing a multi-purpose move with also other global relations besides the relation to the wall.
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What about extending from weak walls, or walls with defects?
Apply my principle (unless you want to sacrifice the wall (temporarily).
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Or do you not extend, but repair the defect?
It depends on the kind of the defect. If its defense also creates (very) thick shape, then defense might be better. E.g., transforming a cutting point into one's own hanging connection might be such a case.
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Bill Spight
