2.1) When I try to log in with my user name and password, I get a response "Invalid user name or password!".
Please make sure that you are really entering your correct user name and password. Passwords are case sensitive, so you have to type it exactly as it was registered with your account. If it still does not work, try to use your email address at the "Did you forget your user name or password?" form to request a password change.
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)