Rob Speer on 25 Sep 2003 13:48:30 -0000


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[Spoon-business] Go rule fix


[[ I've noticed this problem with the rules, which hasn't been a problem
yet but might become one. If a move results in two dragons being in a
captured state, but one might live when the other is gone, the rule
removes BOTH of them. This makes the typical Ko situation actually
impossible:

. A B .   
A B . B      
. A B .

A places a stone in the middle of B's diamond:

. A B .
A B A B
. A B .

Since A made the move, B's stone gets captured.

. A B .
A . A B
. A B .

Now A's stone has a liberty, so it is not captured.

However, with the text of the rule as it is now, A's stone would be
captured simultaneously with B's, making the move actually illegal as A
played a stone that was immediately captured.

In 2-player go, the opponent's stones are always captured first. The
logical extension of this is:
]]

I propose:
__After you.__
{{
Add this paragraph to Rule 1639, section D:
{{
Multiple dragons can be captured in the same turn, but one at a time.
If, as a result of a stone being placed, there exists more than one
Dragon with no liberties, then the player making the capturing move
chooses in what order they are captured. If a capture creates Liberties
for a Dragon that had none, then the Dragon with the newly-found
Liberties is not captured.
}}
}}

-- 
Rob Speer

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