Re: [computer-go] Ko and transposition tables

[Arend Bayer <arend.bayer@xxxxxx>]

On Wed, 11 May 2005, Peter Drake wrote:

> > > > One option is to XOR all previous-board Zobrist hashes and store that
> > > > value in the table as well.  This would take care of #1 and #2 below.
> > > > 
> > > 
> > > I may have some misconceptions about Zobrist hashes, but this doesn't
> > > seem like it would work.  Suppose I play the move sequence A, B, C,
> > > D.  This produces the following sequence of Zobrist hashes:

Of course you are right this doesn't work. I think you should not try to
implement super-ko, just Japanese ko rules. Then adding a special hash
for the "forbidden move" position is enough.

Arend

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