natural situational superko [#1654]
: natural situational superko
(2008-12-08 17:06) [#5391]
I would like to make a page about it but honestly I don't understand what it is and how it differs from an situational super ko.
So therefore this question.
(to persuade somebody more knowledgable than me to make this page)
natural situational super ko: A player may not use a board play to recreate a position if he has used one to create it.
The natural situational super ko rule treats causes and consequences as to prohibition the same way: Both can only arise due to board plays. Thus natural situational super ko is conceptionally clearer than situational super ko that also allows pass plays to cause situational prohibitions. In practice, natural situational super ko and situational super ko have almost always the same outcome, although natural situational super ko sometimes allows unfamiliar move sequences.
: Re: natural situational superko
(2008-12-08 17:34) [#5392]
The difference is subtle, and unlikely to affect any realistically played game.
The only difference is that under situational superko (non-natural), you cannot make a move that creates a position that was on the board previously after you passed. With natural, you are allowed to make such a move.
Example on 5x5 board:
Notice the subtle difference, the marked stone at a in the first diagram is not in this one