-Later:
-Let choice of time control, allow correspondance play, several games at the same time
-==> need to use indexedDB instead of localStorage. Maybe with Dexie https://dexie.org/
-Each user would have a unique identifier stored in the client DB.
-Allow to cancel games (if opponent doesn't connect again)
-Identity would be browser-based: different games on smartphone, home computer, work computer... (why not ?)
-Index might still look the same, and variant page would have another tab "Games"
-==> running, and finished (which can be deleted from local memory)
-(A true analysis mode could be implemented also, to navigate in completed games --> use a button)
-Allow challenging a specific player (by his chosen name)
-But keep the random pairings as main playing way + always playing in ZEN mode,
-except when accepting an individual challenge.
+S-chess https://en.wikipedia.org/wiki/Seirawan_chess
+
+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.
+
+Take(a)n(d)make : if capture a piece, take its power for the last of the turn and make a move like it.
+If a pawn taken: direction of the capturer.
+
+"Ball" Chess: 9x9 board, ball on center square. 2 queens ?
+To take the ball when it's free you need to capture it.
+To take the ball when it's used, u need to take the piece.
+Goal: bring ball to final rank.
+Possibles passes : soit à une pièce, soit sur une case.
+ --> remplace un déplacement de pièce. Par exemple pion a2 passe à cavalier a4 = 1 coup.
+ --> selon le mode de déplacement standard (donc tout droit pour les pions)
+Pas de notion d'échec ou de mat (?)
+Si une pièce est mat elle donne le ballon (?)
+
+Maxima, Interweave, Roccoco
+
+Synchrone Chess: allow to anticipate en-passant capture as well :)
+
+Dynamo chess