The FIDE Online Arena is fun and useful for both users who have a subscription and those who don’t. The subscription is for those who want to play online-rated games and work towards getting the FIDE Online Arena Titles recognized by FIDE. Playing rated games gives you a start in professional chess (here is where you can buy a subscription).
But you can also enjoy the Arena without having a paid subscription. You can:
Play unrated games
Play in World Chess tournaments
Play in prized tournaments with an entry fee
Analyze your games
Get online tournament certificates
Start or join Clubs
For some of these features, you might consider registering for free — you will be able to save your game history and chat with friends and opponents.
You might be eligible for a free Pro subscription if:
you have subscribed at Old Fide Arena and your subscription has not expired yet. In that case please send the sync request to firstname.lastname@example.org
you are an offline player titled with WIM / IM / WGM / GM
Titled offline players will be assigned a free online pro membership.
To get the promo code please send the following information to email@example.com
A selfie where you are holding your ID (passport or driver's license will work perfectly)
your current FIDE ID number