Robert, I just tried to answer Jann questions (maybe I missed Jann pointRobertJasiek wrote:I do not understand what you are trying to say. Please explain!Gérard TAILLE wrote: Can white prevents black to make infinite passes? Obviously the answer is NO?
Can black prevents white to make infinite passes? This time the answer is YES, isn't it?
The situation is not symmetrical => black has an advantageous loop.
Considering your questions the point is to avoid mixing the two questions above. It is true that if black plays a sequence showing infinite passes for black then white would have also infinite passes. But that was not the questions above.
Can white prevents black to make infinite passes? Obviously the answer is YES?
Can black prevents white to make infinite passes? the answer is still YES?
The situation appears symmetrical => no advantageous loop.
).These "have a loop" and "have an advantageous loop" doesn't seem clear enough. Do sequences with double passes count as loop? If no, how to "have advantageous loop" if opponent passes (once) after my pass? If yes, would a sole double ko seki make a loop? Maybe an advantageous loop even, breaking it?
I am not quite sure what additional information you want. Maybe I can clarify why I invented this "advantageous loop".
When you take a set of positions with potential loop (typically with three kos) the results for these positions given by J89 or J2003 or any traditionnal japonese rules depend clearly of the specific position. The work I have done was to try to find a particularity which can tell me if the result will be territory or a seki. I hoped and I was alomost convinced that such particularity must exist to explain the logic of japonese rules and result expected.
The result of my search is : yes this particularity is simply the answer to the two questions:
Can white prevents black to make infinite passes?
Can black prevents white to make infinite passes?
If the answers to these two questions are not the same then, for all examples I studied, the result will be dead versus alive stones (using common GO language) and the answer to the two questions tell us which side is in the best position. If the answers to these two questions are the same then, for all examples I studied, the result will be seki, neither side having an advantage.
In order to reach a result as close as possible to the expected result my view was simply to introduce these two questions within confirmation phase.
OC the exact wording has to be studied carefully but this is the idea.
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) to write. Seems that it was too deep in the night...
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