I came across this situation recently while watching a game of a 13k vs 13k. When I did my counting practice I didn't count the left white group (sorry, don't know how to mark stones) as dead, but when the 13ks did the counting, they counted it did. I can't see the sequence that kills white. Does anyone see the solution? I only included as much as I thought was necessary.

Click Here To Show Diagram Code

[go]$$ Black to kill
$$|....X.X
$$|...XOXX
$$|XXXXOX.
$$|OOOXOXX
$$|O.OOOXO
$$|.OOXXX.
$$|XOOXOXX
$$|.XOOOXO
$$|XXXOXXO
$$|XXXXOOO
$$|X..XOXO
$$|OXXXXXO
$$|OOXOOOO
$$|XOOOXOX[/go]

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??/10,000

Don't know! Haven't been counting. Will count eventually...

Assuming external stones are alive, then you are correct, white is alive (in seki). If black fills the ko, white plays in black's eye to maintain the seki.

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