Unsettled eyeshapes

    Keywords: Life & Death

The following eyeshapes are unsettled. There is a nakade to kill them.

[Diagram]
Three in a row.  

See straight three. Black can almost fill the eyespace with two stones, leaving White with a dead eyeshape.

[Diagram]
Bent three  

See bent three. Same comment as above.

[Diagram]
Pyramid four  

The shape here is known as the Pyramid Four. Black has a nakade at 1, the vital point. White is reduced to a single eye, which Black can almost fill with straight three or bent three. White is dead.

[Diagram]
Cross.  

In this cross of size 5, Black can kill White by playing at 1. Next he can almost fill with a pyramid four.

[Diagram]
Bulky five.  

This shape, nicknamed the 'bulky five' in English, is killed by the placement at 1. Next, he can almost fill with a squared four. White does have a ko threat to live at a.


[Diagram]
Rabbitty six.  

This is the so-called rabbitty six. After 1, Black can almost fill this eyespace with a bulky five and White can do nothing about it. As for the bulky five, White can threaten to live at a as a ko threat.


Unsettled eyeshapes last edited by Malcolm on June 1, 2018 - 10:19
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