After capturing the screen with the "Print Screen" key, the image can be pasted into any graphics program, so I don't see the need for a dedicated screen capture utility.
(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)