In message <[EMAIL PROTECTED]>, Don
Dailey <[EMAIL PROTECTED]> writes
When someone mentioned a position where a pass-alive group should be
sacrificed - I wondered if it was also due to PSK issues.
I want to clarify something I said about PSK. I don't think the rule is
"wrong" in any sense - after all you can make up any rules you want as
long as they are internally consistent. I just believe it's a rather
arbitrary rule which has been accepted primarily because it rarely turns
out to make a difference in most situations.
PSK has been accepted by KGS because it is what the Chinese rules (as
used on KGS for computer Go events) appear to specify. But I suspect
that the authors of the Chinese rules never even considered PSK and SSK
as alternatives.
Personally I prefer NSSK (Natural Situational Superko) to SSK, and SSK
to PSK. I think that very few people who understand the difference will
prefer PSK.
Nick
For instance, I could add a rule to chess which says "it's illegal to
move a bishop to g2 on the 8th move." It would be a rather silly and
arbitrary rule and wouldn't be consistent with the spirit of the game,
and it would introduce a small bias against white for no good reason -
but it would be a valid rule and the game could still be played
reasonably. However it would be an ugly wart on the game. (Chess has
a lot of funny rules in it anyway which have been added over the years
to improve the game.)
- Don
On Mon, 2006-10-23 at 11:56 +0200, Erik van der Werf wrote:
On 10/23/06, Tom Cooper <[EMAIL PROTECTED]> wrote:
> At 01:54 23/10/2006, you wrote:
>
> >There was a posting on this list with an example of a (contrived?)
> >situation where sacrificing a pass-alive group is appropriate, in
order to
> >win a ko that is more valuable. Is even #1 "100% admissible"?
> >
> >Weston
>
>
> I must have missed this, and find it surprising. Can anyone
remember the
> example?
>
I probably posted that; it is a superko anomaly.
. O O # # # O O .
O . O # . # O O #
O O # . # O O # .
# # # # # O O # #
O O O O # # O O .
. . O # # # # O O
O O # # O O O # O
O . O # O . O # #
O . O # O O . # .
9x9 board, superko, area scoring, 6 komi for White
It does not matter who plays first.
Assuming that the players agree that white's upper left group is dead
the position can be scored as it stands (jigo).
Solution at http://www.cs.unimaas.nl/~vanderwerf/pubdown/stelling3.sgf
Erik
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--
Nick Wedd [EMAIL PROTECTED]
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