It turns out that 100 square Gothic Chess was written about in a letter by Capablanca to someone in 1935, according to Edward Winter. He was still calling the Chancellor the Marshall and the Archbishop the Chancellor back then. This board was set up exactly like Gothic Chess only it was 10x10 in dimension and not 10x8. Capablanca said he did not like the 10x8 version since "the Bishops strike through to the Rooks". So it looks like he examined but rejected Gothic Chess. Does this mean it cannot be patented? I think 10x10 Gothic could be played here anyway.