BQM 462

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[Diagram]

Invasion

Fernobob: Playing as white, I was recently faced with the following invasion. I tried W1 because it looked like an unreasonable invasion, but after moves 1 to 8, it seems to be alive. I've looked around for other moves that might work, but can't find any. I always thought that this was a fairly secure shape and feel that it shouldn't have lived. Is there any way to kill it, or at least end up with a slightly better outcome?

Andy: Not recommended, but if you really have to kill, white play at circle seems to do the job.

The shape of the three white stones have a name, or a least a page, at SL...anyone remember what it is called so that we might link the pages ?

[Diagram]

Invasion


[Diagram]

Point of symmetry

Bill: W2 is on a point of symmetry. Now, as Andy Pierce says, Black cannot live inside. Note that W8 is necessary to give White another liberty if Black cuts on this side.

[Diagram]

White wins the semeai

Bill: Note that W2 and W6 give White an extra liberty, which enables White to win the semeai. Note also that Black gets something in exchange for losing the invaders.



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