-PGN text is not selectable (understand why?!)
-Checkered stage 2: switch button at reserve position (or on top).
-Mode expert: game.js, button on top (with online indicator)
-Turn indicator on top too (black or white)
+For animation, moves should contains "moving" and "fading" maybe...
+Depth 2 or 3 depending on variant and if we detect smartphone or not?
+(static get SEARCH_DEPTH() { return 2; })
+Sur page d'accueil lien "contact" avec mail + instrus en cas de bug