-Merge variants 1, 2 (3) into one with sub-variant selection when starting a game (New Game + vs engine + analyse)
-E.g. Checkered 1 & 2 into one, and so on.
-Need additional field in variant code... in a generic way (radiobutton or select or checkbox?)
+Merge Orda + Empire + Hoppelpoppel + Newzealand getSlideNJumpMoves() into base_rules.js
+=> allow to simplify getPawnMoves in RoyalRace (and some getXMoves in Shatranj)
+
+Option "free placement" in Hidden