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Kevin Pacey wrote on Thu, Dec 6, 2018 11:45 PM UTC:

I mentioned more about the A and D as I'd used a formula for them in the first paragraph of my previous post in this thread, and I thought I'd elaborate on my reasoning for the value I got for each of these pieces, which figured in my later estimate of the value for a WAD.

Sometimes it's easy to incorporate some of your observations (or other people's, such as Betza's) into the ways I use to estimate piece values. I seem to remember somewhere seeing a x0.5 penalty for non-capturing moves by piece types, for example.

Other times I'd have to go back and revise many estimates I've given for piece types here and there. I've sometimes gotten around to doing this. Meanwhile, I usually note that my estimates are tentative where I write them down. I figure people appreciate seeing something they can chew on, even if the values given sometimes turn out to be considerably off. Perhaps I can in time give your values (where known) in all places where I give mine, for the sake of comparison by the reader. The values of Archbishop, Amazon and BvsN are particular problem issues for me, on 8x8 at the least.

I suspect most players take values given anywhere (perhaps moreso when given by someone not into CVs seriously for that many years, like me) with a big grain of salt. Many/most CV inventors/commentators (e.g. Fergus, perhaps) never, or almost never, give numerical values (though, e.g. Fergus, may indicate a hierarchy for the piece types in the setup, and/or indicate mating potential of these), possibly to be safe, or to avoid disputes. Still, omiting such is naturally less interesting/useful than otherwise. At least you're regarded as an established authority on piece values, so people would most likely take yours (if you've given such) over mine when in doubt about piece types' values for on a given board. My main problem is I don't completely trust computer studies, by anyone, as I've written in the past. At the moment my primative methods at least do seem somewhat applicable to a range of board sizes, shapes and piece types, including those where computer studies have yet to go.


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