Teach your child chess manners in addition to table and social ones. Chess has clear rules and etiquette which must be followed for a proper game. Review this worksheet with your kid and discuss the pictures that show inappropriate behaviours. This will help them understand how to play the game correctly and with good manners.
There is no such thing as too much sharpening of skills. Encourage your child to learn more about chess technicalities with this simple worksheet. It shows them how a bishop moves: along diagonals any number of squares, but it can't jump over other pieces.