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90 degree shapes at Sensei's Library

90 degree shapes

    Keywords: Shape

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This page is considered superfluous or obsolete and will be removed. If you object against removing this page, kindly remove the removal template from the page content, give an explanatory note in the summary and possibly improve the page or linkage to it, so that its purpose becomes clearer.
Reason: As Bill said: a satirical commentary on SL shape pages - It now has served its purpose, if not I rather edit the other pages than to have a satirical page to prove a point


[Diagram]
Empty triangle  

The empty triangle is a shape in which three stones form a 90 degree angle. It is also a bad shape, as its stones are too close together.

[Diagram]
Tiger's mouth  

The three stones in a tiger's mouth also form a 90 degree angle. They are not so overconcentrated, so the tiger's mouth is not as bad as an empty triangle.

(Those who think that the tiger's mouth is a good shape are imagining it in certain configurations of other stones of the opposite color. On the empty board it is overconcentrated. -- Bill Spight.)

Below are other ninety degree shapes formed by three stones of the same color, ordered in increasing Euclidean distance and, presumably, increasing efficiency (more or less). At some point, probably not reached on this page, such shapes become good in themselves as the stones work together.

[Diagram]
One space jumps  

(sIG): It would be better to have the stone at a instead of 1, no? Otherwise it's quite easy to cut at b (without terrible shapes)

[Diagram]
Keimas  

See big bulge.

[Diagram]
Hazama tobis  
[Diagram]
Two space jumps  
[Diagram]
Ogeimas  



See /Discussion.


90 degree shapes last edited by tapir on March 18, 2013 - 14:20
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