In message <[EMAIL PROTECTED]>,
John Tromp <[EMAIL PROTECTED]> writes
hi Nick,
On 11/12/07, Nick Wedd <[EMAIL PROTECTED]> wrote:
The results of yesterday's KGS bot tournament are now available at
http://www.weddslist.com/kgs/past/32/index.html.
Your comments and corrections will be appreciated as usual.
You wrote:
"In the round 8 game between FirstGoBot and break13, this position
appeared. White has just captured two stones, and Black (break13)
tried to recapture one stone. This ought to be allowed, no superko
repetition is involved. However break13 was not allowed to recapture,
and eventually timed out. Readers of this page can confirm that
something has gone wrong by clicking on the above game link, using
CGoban to look at the game, and going to the final position. It is not
then possible to play a stone at L11, though it ought to be. This is
very odd, and I have reported it to wms."
However, there is nothing strange going on here. It's a simple
case of sending 2, returning 1, which is prohibited by Positional
Superko. Recapturing would repeat the position of 3 plies before
(with white to move instead of black).
Yes, you're right. It's positional Superko. It's surprisingly easy to
miss this, even when you are looking for it.
Nick
--
Nick Wedd [EMAIL PROTECTED]
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