Ah, that makes sense. I'd been thinking that black lost a point of
territory at G1, but of course that's still black territory after the
dead white stones are removed.
All's right with the world.
Thanks,
Peter Drake
http://www.lclark.edu/~drake/
On Jul 19, 2010, at 11:41 AM, John Tromp wrote:
dear Peter,
Here's one for you tournament directors and rules experts out
there. I'm
probably missing something obvious (and will realize it just after
I send
out this post), but here goes:
5..........
4#########.
3.#.OOOOO##
2##.O###OO#
1.###.#.#O#
ABCDEFGHJK
In the diagram above, the white stones are obviously dead. The
question is:
does white profit by playing G1, forcing black to connect at E1?
(There is
no current ko.)
It seems that, under AGA rules, the answer depends on whether we
use area
(Chinese) or territory (Japanese) counting. I thought that wasn't
supposed
to happen.
Under area counting, all of this area belongs to black and
prisoners don't
count, so clearly white's struggling is irrelevant.
Under territory counting, the G1-E1 exchange gains one prisoner for
each
player and costs black a point of territory. (Both players play one
move, so
the pass stones aren't relevant.) Isn't this a gain of one point
for white?
Is it the same under Japanese rules?
The prisoner W gains is already compensated by the creation of a new
empty point in B territory (that the capture black stone used to
occupy).
Similarly, the addition of the white stone as prisoner is compensated
by the addition
of the black connecting stone.
regards,
-John
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