I used both the chess app and chess.com website through a browser on my smartphone. As of a few days ago, the website looks similar on the browser as it does on the app, and I miss the desktop version on my phone.
Although I think changing the website layout/code for smartphones is a good thing, you should still let the users use the desktop version on their phones if they want to.
The site will load the mobile optimized version by default, but your mobile browser will probably have an option to load the desktop version. Just check that and it will load.
I used both the chess app and chess.com website through a browser on my smartphone. As of a few days ago, the website looks similar on the browser as it does on the app, and I miss the desktop version on my phone.
Although I think changing the website layout/code for smartphones is a good thing, you should still let the users use the desktop version on their phones if they want to.