moha wrote:
Ok, so resolving the ko can wait. But I still don't see all conditions of this approach - have you written them somewhere?
This is an idea I have had in the back of my mind for some time, but I had not written anything down yet. I decided to bring it up in response to lightvector's topic about his version of the Japanese rules. It is based upon Berlekamp's original komaster rule, where the komaster gets two moves in a row (unless only one is needed to win the ko). I have adapted it for play at temperature -1 and for multiple kos, and I allow each player to attempt to claim komaster status.
Originally I allowed the koloser to make a ko threat that the komaster might answer, because the koloser cannot take the ko back, anyway. She may capture the komaster's stones, however, which would invalidate the komaster's claim.
There are four possible outcomes. 1) Only Black can successfully claim komaster status, and gets to win the ko. 2) Only White can do so. 3) Neither player can do so, in which case the ko remains unfilled, normally as seki. Sometimes during the play at temperature -1 conditiions will change and one player or other will be able to make a successful claim. 4) Both players can do so, in which case the ko position is not scorable. The rules will have to deal with that problem. The anti-seki of the J89 rules is not allowed at the end of play, for example.
Also, for kos that arise during the play at temperature -1, such as in Bent Four, if the player whose turn it is can successfully claim komaster status, then the other player cannot attempt to do so. And I suppose that there can be only one komaster claim at a time.
Quote:
For example, the last diagram of the post you refer to ("white komaster, variation") seems unclear. If W only aim to resolve the ko, the previous diagram seems better for him. If not, I don't see how he could capture (or achieve anything) in the last diagram if B insist on the cycle. What rules are in place there?
Since White is claiming komaster status for the top ko, Black cannot take it back. And by ordinary ko rules Black cannot take the double ko back, either. That allows White's komaster claim to succeed. Then there is still the double ko to resolve, but it is fairly obvious that Black is dead.
Here is the diagram again.
- Click Here To Show Diagram Code
[go]$$W White komaster, variation
$$ | . . . . . .
$$ | O O . . . .
$$ | B O . . . .
$$ | 1 X O O O .
$$ | X X X X O .
$$ | W X 3 X O .
$$ | 2 O X O X .
$$ | O O O O X .
$$ | , O X X X .
$$ | O O X . . .
$$ | X X X . . .
$$ | . . . . . .[/go]
at
After
Black has no local play. White can then win the ko by capturing the Black stones, assuring life. If Black plays elsewhere White ignores the play, since he can make a successful claim. Presumably White could make a successful claim by filling the ko with
, but this way there is no question.