There is a link at the bottom of most pages that says Try the New Chess.com. Click that and log in.
New Chess.com Website

just go click man vs computer and it will say the old website cannot handle this and then it shows you the link to the new website# new websites

porque sigue apareciendo la vieja website, la nueva es mucho mejor.gracias¡Por favor, sea relevante, útil y agradable!

You can switch back through the link in the menu or use chess.com/switch. It may give an error the first time but if you refresh you should be able to do it.

Type chess.com/switch into the address bar, hit enter. If there is an error, refresh. That should give you a red banner asking if you are sure you want to switch. Click the switch link in the banner.
Hello,
in the last week I used the new chess.com site with a complete new interface, which I personally liked more than the "old" one.
Today it switched back to the old site. How can I get back to the new one ? any ideas, or information about this ?
Thank you.