-Add problems
-https://www.janko.at/Retros/Glossary/Dynamo.htm
-https://www.janko.at/Retros/Problemkiste/N1995-04.htm#3718
+Ambiguous chess
+https://www.chessvariants.com/mvopponent.dir/ambiguous-chess.html
+Need special highlight square --> similar to enlightened for Dark, in Board.vue
+Also in notation, show only dest square for "opponents ambiguous moves".
+Similar to Marseille-chess, white first move only 1 subTurn, do not choose a square.
+Then black has a free first move, then choose a square, and the process goes on.
+
+(Note: could simplify Marseille FEN, just indicate turn)
+
+[Sittuyin (burmese chess) --> probably not]