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I recently read a book which discussed this shape, calling it the little pig's mouth. However I can't recall all it said :-(
The shape in Dia 1 occurred on a neighbouring board to mine during round 3 of the 2001 Wessex tournament, later it changed to that of Dia 2.
(If you are wondering whether I should have been studying a neighbouring board rather than my own game, please wonder by yourself!)
Anyway I had a feeling that Dia 1 could be killed, unsure if outright or in ko, and I had no idea about Dia 2.
This month's question: Is the corner settled? Or should something have been done about it?
8 at 4.
As becomes apparent, Dia 3 is a ko. This covers the status of Dia 1.
In Dia 4, where 4 is played at the 1-1 point, it is still ko. Unfortunately white cannot fill at 9 with 8' due to a shortage of liberties.
8 retakes
at 
.
For the record, if there is an extra stone, as Dia 5, the corner lives outright.
No. It is still a ko, in any of the variations which may get played.
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Last updated 2004-08-10
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