-Generator variant, called "Matrix" ?
-Peces on first rank never move but generate new pieces. Pawn don't generate.
-A generator captured and replaced by a similar piece does not generate.
-King does not generate. No castling. En passant possible?
-Goal is still checkmate.
+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.