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Dave McCooey wrote on 2020-07-30 UTC
Hi Kevin.  The 91-hex board endgame databases that I generated take into account colorbound pieces, including the distinction between "central" and "non-central" colorbound pieces.  The results are available on these pages, with a link from this page.  For the KNBvK endgame, I use the suffix "(xc)" for the central-B case and "(xn)" for the non-central-B case.  The central-B case has a slightly higher winning percentage (0.98% vs 0.25%), but both of these percentages are quite small.  Over 99% of all positions in both endgames are drawn.

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