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@HGMuller

The first problem to solve is that the square coloring doesn't alternate properly. If there's a way to set colors more manually, I'll do that. I think the coloring is important to see the bishop bindings and rook's alternation, so I'm not willing to just leave it as is. I can't put just one hole between little boards, or the knights will be afforded an incorrect move. I could put three holes between little boards, but that'll have quite a bit too much empty space (can you thin specific ranks+columns?).

Skimming the documentation page for the interactive diagram, I think I can do this, but just by creating a background image and setting the background parameter (keeping two spaces between boards)? That's a little obnoxious, and something like Game Courier's method for specifying custom coloring patterns would be nice, but also not a big deal.

Ideally I could override the coordinates

This doesn't seem possible besides setting a starting rank number, but I can suppress coordinates altogether. A new parameter with comma-separated rank/file names would be really nice.