-Bugs, limitations:
- - switching chess when castling: show 2 promotion kings (??)
- - Crazyhouse: TODO = keep track of promoted pawns.
- - Checkered: implement stage 2 ?!
+"FreeBoard", re-using a lot of Board logic, but with SVG (empty) board + SVG (empty) reserves.
+Will be used for variants with custom non-rectangular board (Hex, at least)
+Or, with other board shapes (see greenchess.net for example)
+
+Would be nice to display some better variants names (Pacosako -> Paco-Ŝako etc),
+but the "formatted" name with uppercase + all lower cases would still be required.
+(For example in variants list, or tournament variant field).