Re: [computer-go] Ko and transposition tables

[Chris Fant <chrisfant@xxxxxxxxx>]

> > Using your notation, notice that the value F (which presumably
> > represents a stone at some location) is no longer a factor in the
> > final cumulative hash.  This means that the cumulative hash will be
> > the same no matter where move 3 is played.  Isn't this a problem?
> 
> Yes, that is a problem.  Thanks for pointing out that it was me who
> was mistaken.  So a simple modification would be the following:
> 
> NewCumHash = (OldCumHash<<1) ^ BoardHash

Unfortunately that has the undesirable effect of making move sequence
a,b,c,d result in a different hash than c,b,a,d.  Hmm, back to the
drawing board...
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