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Kevin Pacey wrote on Fri, Jan 24, 2020 01:05 AM UTC:

By coincidence or not, H.G., that's about 87% of a queen (on 8x8, at least) which is in line with the 85% ratio offered by the old ZoG article (for 8x8), as well as the 88% (if I read right) offered up by the Betza article. I didn't check everything he's ever written so as to see if Betza thought the ratio applied on all board sizes, though. Last night my own quick sketchy re-calculations came up with a 90% ratio for on 12x12 (at least), not too different, but I would be less confident if not comparing it to ZoG and Betza's percentage figures.

One thing calculations based on theory do have the advantage of is offering up something quick, if computer analysis has yet to be done due to awkwardness of board size, for example. Players can always take calculated (or even computer-generated) piece values with a grain of salt, and/or treat them as ballpark figures, everyone should understand that, at least for CVs that aren't much explored. There is also the question of exact board size/shape being tested, exact armies used in a starting setup being tested (and the exact squares the pieces start on, as Chess960 might even show). Not only that, but the strength of an engine being used for testing, IMHO.

Dax00 didn't so far offer up a way to numerically estimate the value of a piece like the Gryphon (on 8x8, or 12x12), but rather something that looked like opinion to me. That's fine, if a number can then be offered up as at least a guestimate based on it (unless one prefers to keep it secret). Aurelian has done a kind of calculation already, based on some sort of premise(s), so it seems for 12x12 he agrees with the conclusion that it's better than a queen for that board size - what his exact number for it could be, I don't know.

P.S.: Even the best human chess players still cannot agree on even the exact values chess pieces should have, computers be damned. The current world chess champion values a bishop slightly more than a knight on average, as is tradition for a long time. I may be an exception, in that I think a knight is almost fully equal to a B - and in my days as a young man I reached 2400 USCF chess rating, and nearly 2300 FIDE (later 2400 Canadian rating, in my early 50s). Some would say I'm still pretty weak, since I blunder badly now and then. :)


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