-https://www.chessvariants.com/other.dir/fugue.html
-https://www.chessvariants.com/rules/spartan-chess
-https://www.chessvariants.com/mvopponent.dir/avalanche.html
-https://www.chessvariants.com/mvopponent.dir/hypnotic-chess.html
-https://www.chessvariants.com/mvopponent.dir/mesmer-chess.html
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-Squatter Chess: safe on last rank = win
-Companion Chess : pieces of same nature don't attack each others
-Crossing Chess = win when the king cross half-board
-Crown Chess: place all units on move 1 (similar to Sittuyin, more freely --> in own half-board, possible pawns on 1st rank)
-Medusa Chess = Isardam
---> à chaque déplacement, check attaques directes + découvertes autour de case de départ dans 8 directions (pas caval)
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-Kingmaker: pawns can promote also into enemy king
---> no king tracking, getCheckSquares + underCheck test all kings
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-Eightkings: 8 pawns + 8 kings (non-royal until the last remains?)
---> yes seems better, no king tracking + no underCheck/...etc when >= 2 kings
+"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)