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Eye Shape
The concept of Eye Shape is related to the shape of the space a group has which can potentially be transformed into eyes. See also: Since the eyes of a group can be found at different ends of a group, I'm inclined to stick with my earlier attempt "the (quality of) the shape a group has, with respect to the goal of making eyes". But how would you differentiate that from e-space/potential? With the examples below. --Dieter Otherwise said, I wouldn't think of eyeshape as being a property of the eyespace, but rather of the group. A group can have plenty of eyespace or almost no eyespace, but still have good or bad eyeshape according to the disposition of the stones. Not sure though. --Dieter Maybe we could use 'eye potential' as a 'larger' term, which encompasses both the shape and the size of the area(s) where ey(s) can be made? (Not sure either) --Morten That is exactly what I have defined 'eye potential' to be earlier on. --Dieter
The white group has lots of eyespace. But this space is also large enough for Black to build a living group, or at least a group with sufficiently good eyeshape # : - 7 to annoy White. We cannot say that White's eyeshape is very good. The group consists of two straight lines.
In this example, White has much better eyeshape, though the property of his eyespace in the corner hasn't changed. Stated more accurately: White has now two eyespaces, one already being an eye, and one where it will be easy to make a second one.
This white chain is out into the open. It has an enormous amount eyepace. Eyes can be made everywhere.
This group disposes of the same amount of eyespace, but has a lot better shape. The group will have it easier to make eyes, although the available eyespace is the same. As for the shape of the configuration, I'd rather say the shape of the group has changed, than the shape of the eyespace (although a change in the group composition, affects the composition of the eyespace and the other way round).
In this example, the Black stones make a nice shape. Without the marked white stones, the eyespace available is so vast that Black needn't worry about life. With the marked stones present, the eyespace is greatly reduced, and now Black doesn't feel that comfortable anymore. A move at A e.g. could become annoying. Eye potential for me is the combination of the space available to make eyes (eyespace) and the shape of the group with respect to the objective of making eyes (eyeshape). I agree that in tsumego, where there is usually one group surrounded by another, eyeshape, eyespace and eye potential are virtually synonyms. Language-technically they can't be synonyms. You can't reduce eyeshape or destroy eyespace. Well, the latter probably is possible, strictly speaking. (sorry for being so exhaustive) --Dieter This is a copy of the living page "Eye Shape" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |