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Smallest Group with Two Eyes
Path: LifeAndDeath   · Prev: KillingShapes   · Next: BasicLivingEyeShapes
    Keywords: Life & Death

This is a list of the smallest groups with two eyes. Only groups that have two solid eyes are included here. A group is often considered alive before it has formed two solid eyes; see Basic Living Eye Shapes for some examples.


In the corner

In the corner, six stones are the minimum needed to complete a group with two eyes.

[Diagram]
First corner group

[Diagram]
Second corner group

[Diagram]
Third corner group

[Diagram]
Fourth corner group

  • This seems to be the same as the second corner group. The eyes are the same, the stones are slightly different.

[Diagram]
Fifth corner group

[Diagram]
Sixth corner group

[Diagram]
Seventh corner group

6 stones, 6 different eye shapes, 7 different stone shapes



On the side

On the side, the smallest groups with two eyes have eight stones.

[Diagram]
First side group

[Diagram]
Second side group

[Diagram]
Third side group

  • This looks like the second side group. Different stones, but the same eyes.

[Diagram]
Fourth side group

  • Again the same as the second group

[Diagram]
Fifth side group

8 Stones but 4 different eye spaces.

Anonymous: Does this really count as an 8 stone group? White has a ko threat at a inside the group that he will play eventually, making this a 9 stone group for black.



In the center

In the center, 10 stones are required to make a group with two eyes.

[Diagram]
First center group

[Diagram]
Second center group

[Diagram]
Third center group

[Diagram]
Fourth center group

  • These all have the same internal eye space.

10 stones but only 1 eye shape.



Here's a board containing all of the above groups:

[Diagram]
Smallest groups with two eyes


The smallest group with two eyes exists on a 3x1 board!

--RobertJasiek


Authors



Path: LifeAndDeath   · Prev: KillingShapes   · Next: BasicLivingEyeShapes
This is a copy of the living page "Smallest Group with Two Eyes" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.