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H. G. Muller wrote on Wed, Feb 19, 2020 02:27 PM UTC:

The 'diagram designer' was not made by me, but by Fergus. I am only responsible for the 'Interactive Diagram'. Because you explicitly address me, I will answer for the latter:

It is certainly not possible in the Interactive Diagram to use other board topologies, such as hexagonal bords, or circularly deformed boards. All boards must consist of a corner-connected grid of squares. Irregular shapes of such boards (such as e.g. in Omega Chess, with its wizzard squares, or the citadel of Tamerlane Chess) can be emulated by declaring some squares in the smallest surrounding rectangle to be inaccessible 'holes'. The Design Wizard in the Interactive Diagram article has no provisions for defining those, though. But you can just edit the HTML code that it delivers to add the holes; you only need to define an extra 'piece' with the name 'hole', followed by a list of squares that should be holes.


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