its for ddos protection, it literally says "ddos protection by cloudfare"
chess.com is checking my browser

The title message and sometimes a captcha comes up when i try to log in.Why is this?Are they downloading somwthing?
It's nothing to worry about. The message is a result of the site using Cloudflare DDoS protection. I think it only kicks in when the site gets too many logins in a certain time period, which doesn't happen too often.

The title message and sometimes a captcha comes up when i try to log in.Why is this?Are they downloading somwthing?
It's nothing to worry about. The message is a result of the site using Cloudflare DDoS protection. I think it only kicks in when the site gets too many logins in a certain time period, which doesn't happen too often.
It can also happen if you try to access a URL that requires authentication to access. I have it happen a lot when my session has timed out and I try to access messages.
The title message and sometimes a captcha comes up when i try to log in.Why is this?Are they downloading somwthing?