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H. G. Muller wrote on Sat, Oct 8, 2016 08:29 AM UTC:

A dramatic difference between the mG-enhanced and the mZ-enhanced Knight! The latter seems significantly stronger than a Bishop. (Even when the latter operates as a pair.) Of course the context is different as well, but not that different.

Did the values you programmed into Fairy-Max take account of the Knight being more valuable than the Bishop? If not, the tests could exaggerate the difference. There is a paradoxical effect that between pieces that intrinsically are nearly equal, the one that the engine values the most is worth the least. Because the fear that it would be exchanged for the one the engine values lower will inhibit the use of it. So if a Bishop, which in reality is less powerful than the enhanced Knight, would be given a value higher than it, the Knight can wreck its damage with impunity, scaring away the Bishop, where in reality the Bishop should chase the Knight away. This effect pulls values of nearly equivalent pieces closer together, and is no doubt the reason why the Bishop and Knight are so very close in value in orthodox Chess.


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