[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [computer-go] Super Ko on KGS ignores player to move

Erik van der Werf wrote:
On 8/13/05, john tromp <John.Tromp@xxxxxxxxxxxxxxxxx> wrote:
That's right. Chinese rules use the simpler positional superko,

No they don't. The official Chinese rules do *not* use superko. (*1)
The examples shown at http://www.cs.cmu.edu/~wjh/go/rules/Chinese.html
(Chapter 3. Section 20) clearly indicate that balanced (*2) long
cycles are declared drawn. The only exception to this is moonshine
life (which is always considered dead).
Chapter 1, "General Rules", Section 6
states exactly the positional superko rule.

Chapter 3, Section 20, make some further comments on the above section,
such as:

  3. In rare situations such as triple ko, quadruple ko, eternal life, and
     round-robin ko, if neither side will yield, the referee may declare a
     draw or a replay. See Diagrams 4 to 7.

As Fred Hansen notes, This is a clear conflict with Section 6.
I think it should be interpreted as a possible amendment for certain
tournaments. Note that it says the referee *may* ...

I'm not sure what exactly has been implemented on KGS, but if it is
true that positional superko is used then the claim that KGS has "the
Indeed, it implements PSK.

most accurate interpretation possible" (see
http://kgs.kiseido.com/en_US/help/ruleSets.html) is definitely false.
I fail to share your conclusion, which is based on an *ambiguous* commentary instead of the "official" rules text of Chapter 1.

computer-go mailing list