Frequently recommended on chess forums for navigating restrictions. CroxyProxy

It struggles with live "Rapid" games. We noticed occasional "lag spikes" where the clock freezes for 2 seconds. It is excellent for Daily (correspondence) chess, though.

Chess.com’s security systems are sophisticated. They track IP addresses, device fingerprints, and connection patterns. If you log in from a proxy server located in Frankfurt, Germany, and then log in again from your home IP in Texas 15 minutes later, their system flags your account for "Account Sharing" or "Suspicious Login."

Many free proxy sites are riddled with intrusive ads or malicious scripts. Latency & Lag:

A free, open-source alternative with a massive player base and fast interface. ChessKid.com

It would be dishonest to write a "best proxy" article without mentioning the elephant in the room: