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

[John Tromp <John.Tromp@xxxxxx>]

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.

regards,
-John
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