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Chigorin Chess. White has knights instead of bishops and a chancellor for his queen; black has bishops instead of knights. (8x8, Cells: 64) [All Comments] [Add Comment or Rating]
H.G.Muller wrote on 2008-04-25 UTC
It is not obvious to me that this is two. With two Bishops on each color,
each Bishop now has two othe Bishops with which it can cooperate.

When I have time I will run all combinations BNNN, BBNN, BNBN, BBBN and
BBBB against the 4 Knights, to see how the advantage grows. BBNN is known
to be more than double the BNNN advantage (the difference being the pair
bonus, of about 50cP), while BNBN (like colored Bishops) does give double
the BNNN advantage. But I haven't tried BBBN yet. And this measures very
small differences, so it should use many games (1000+).