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Extension From a Wall
Difficulty: Beginner
Keywords: Opening
I've read someplace (haven't been able to find the source again) that there's a rule of thumb saying that from a wall, a safe extension is the number of spaces of the height of the wall, plus one. For example:
In this example, the rule of thumb would indicate that the stone marked with a square is a good extension. Has anyone heard of this rule of thumb before? Is it based on something definitive, or just someone's "good idea" with no basis? -- Remillard The rule of thumb is based on the fact that with the supporting wall, an extension along the side will have a harder time being cut then one with just a single stone, therefore you can make a larger extension. This rule is time tested, not just someone's good idea. Two things though. One, the extension should be closer to the edge of the board, at the 3rd or 4th line at this stage of the game, and the size of an extension is measured in spaces between the stone and the wall, not just the wall, so the correct 5 space extension would be at 'a'. Also, there is also the caveat that past a three stone wall, the variations involved in the cutting become complex enough that this rule of thumb can no longer be followed. One other thing to keep in mind is that for extending into the center, the rule is just one space per stone in the wall. Again, anything past 3 spaces here is risky. --BlueWyvern This is a copy of the living page "Extension From a Wall" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |