From: Tim Casey MV US ADOBE COM>
Date: 13 dec 1995
Subject: Re: IGS/ISS thread
> From: Albyn Jones REED EDU>
> there should be no significant differences in the rating algorithm.
> one question is: what is the nominal difference between ranks? in
> go i believe that a one stone difference in rank is presumed to
> correspond to a winning probability of 2/3 for the higher ranked player.
> is the traditional ranking system in shogi based on the same assumption?
Well, this is already a significant difference in the algorithm. There
is no idea about 'stones'. (At least the last time I played Shogi :) :).
Yes, the basic presumption about the rating system is the basis for difference
in rank. One stone is the same as one rank, or there abouts.
So for Shogi games, a handicap game should not be counted. Because I do
not know of any piece to rank difference off hand. I imagine there is one,
just I am not sure how simple it would be. Also, in Go, the person who
goes first gets a 0.5 advantage, where 1.0 == one stone. None of this
makes sense for Shogi. Although, the person who does has the first move
probably does have an advantage.
All of this comes down to I do not know how the rating system will perform
for Shogi games. If I limit the ratings to even games, and a few other
things which come along, then we will see. This took about 1 1/2 years
on IGS, just to set expectation up front :).
On the other hand, there is nothing inherent in the ratings about Go.
All it takes is the win/loss records for the day. This sill happens.
The basic algorithm is a very sound one for computing ratings. It is
used by the AGA and IGS. The basic function of the ratings, collecting
results, adjusting people, etc; are all working. The only question in
my mind is the question of picking up Go and putting in Shogi represents
a totally new set of unexpected results. It could very well be things
will work.
So when someone comes along as a 4d, in shogi, and plays enough games;
their rating will be computed. Now, if their ratings gets computed to
be a 1d, this is bad. If it gets computed to a 5d/3d, maybe things
are working but need adjustment. I guess this is the kind of process
I expect. (Not the 4d->1d, but the 4d->5d or 4d->3d :).
tim