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🕸Fergus Duniho wrote on Tue, Sep 21, 2004 02:24 AM UTC:

Since I'm working on updating my Chess,_Large.zrf file today, I was paying
more attention to the various games in it, and I started tripping up over
Aberg's variation. In this ZRF, which I originally wrote in 1998, I
implemented both Aberg's variation, or what I thought was his variation,
and a Capablanca variation of my own. When I originally wrote the ZRF,
this page did not exist, and I based my ZRF on the description which is
now at 

http://www.chessvariants.org/misc.dir/chessmods.html

I've just noticed that this old description has a contradiction in it.
The text description places the Chancellor on the Queen's side and the
Archbishop on the King's side, but the diagram reverses this. I based the
ZRF on the diagram, and my own Capablanca variation just reversed the
positions of Chancellor and Archbishop. Since this page agrees with the
old text and not with the old diagram, I take it that my variation was
actually Aberg's variation.

Furthermore, Pritchard's description of Carrera's Chess contradicts the
description on this website. Pritchard points out that Murray reversed the
names of the Champion and Centaur, and our page on Carrera's Chess was
based on John Gollon, who probably got his information from Murray. I
trust Pritchard more than Gollon or Murray, and so I take his description
of the game as more authoritative.

Therefore, it appears that Carrera's Chess, Aberg's Capablanca
variation, and my Capablanca variation all have the same setup. It looks
like my least original variant ever is even less original than I thought
it was. :)

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Comments

Aberg variation of Capablanca's Chess. Different setup and castling rules. (10x8, Cells: 80)

💡📝Hans Aberg wrote on Sat, May 3, 2008 04:43 PM UTC:

H.G.Muller:
| But the point is that this does not alter the piece values.

Right, though that might be just a preferred way to structure theory because it suits human thinking. Essentially, define contexts, and attach values to them. First define piece values in nutralk settings. Then observe that the bishop pair gets an added value. Then try to figure out values for good and poor bishops. And so on. By contrast, computers tend to be very poor at handling such contexts, so other methods might be suitable for programs.

Derek Nalls wrote on Sat, May 3, 2008 03:26 PM UTC:

Muller:

You have my best regards toward your worthwhile effort to publish your
empirical, statistical method for obtaining the material values of pieces
in the ICGA Journal.  My assessment is that it will surely be a much
better paper than the junk [name removed] published in the same journal
regarding piece values.

[The above has been edited to remove a name and/or site reference. It is
the policy of cv.org to avoid mention of that particular name and site to
remove any threat of lawsuits. Sorry to have to do that, but we must
protect ourselves. -D. Howe]

H. G. Muller wrote on Sat, May 3, 2008 03:22 PM UTC:

Sure, this is what people do and have done for ages. It is well known that the advantage of having the move is worth 1/6 of a Pawn, (corresponding in normal Chess to a white score of 53-54%) and that, by inference, wasting a full move is equivalent to 1/3 of a Pawn.

But the point is that this does not alter the piece values. It just adds to them, like every positional advantage adds to them. In my test the advantage of having the lead move is neutralized by playing every position both with white to move and black to move.

💡📝Hans Aberg wrote on Sat, May 3, 2008 11:50 AM UTC:

H.G.Muller:
| As piece values are only useful as strategic guidelines for quiet
| positions, they cannot be sensitive to who has the move.

At the beginning of the game, white is thought to have a slight advantage, and the first task of black will be attempting to neutralize that. And it might be possible set a picee value to that positional advantage, just as when reasoning in terms of getting positional compensation for a sacrifice. Somewhat less han a pawn, perhaps. If one knows about the black/white winning statistics, one might be able to set a value on it that way. It may not be usable for a computer program as it does not change sides, but only computes the relative values of moves.

H. G. Muller wrote on Sat, May 3, 2008 10:34 AM UTC:

As piece values are only useful as strategic guidelines for quiet positions, they cannot be sensitive to who has the move. A position where it matters who has the move is by definition nont quiet, as one ply later that characteristic will have essentially changed. So at the level of piece-value strategies, Chess is a perfectly symmetric game.

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