Other games

While chess should be enough to sustain most of us, the urge to try something new (or different) is understandable. The main issue is that the online community for other boardgames isn't as developed (excluding the classics like Bridge, Go and Backgammon).
There are often sites for a specific game (like Dominion) but if you are looking for a more general site, then https://boardgamearena.com/ might be worth a visit. Setting up an account is free, although some games are restricted to Premium account holders (although they can invite you to play). There are a lot of Euro boardgames there, as well as some of my 'casual' favourites like Sushi Go, and For Sale. It even has a ranking system, so you can compare you skills at Puerto Rico in the same way you can do so with Chess. (PS It does have Chess!)