ALL MINI-GAMES COURTESY OF STUDYING CHESS MADE EASY BY ANDREW SOLTIS
8/pppppppp/8/8/8/8/PPPPPPPP/8 w - - 0 1
"Pawn Wars" is a great way to play and teach kids about chess, each player starts with only pawns on their starting squares and the winner is the first one to reach the eighth rank, this teaches kids about pawn play and promotion. Then later you can bring in the kings, then they will rarely forget the power of the king in the endgame.
7n/8/2pppp2/2p2p2/2P2P2/2PPPP2/8/N7 w - - 0 1
This one is called Forbidden City, this is probably the best way to learn how to play with the Knights, Whites goal is to get to h8 and return to a1, blacks goal is to get to a1 and return to h8. Neither Knight can land on a square where they can be eaten by a pawn, or a square which contains a pawn and they can never enter the square the pawns have formed, thus the name, Forbidden City. Of course whoever moves first should win but it is not so easy for beginners.
r7/8/8/8/8/8/2PPPPPP/8 w - - 0 1
This is called Rook vs Pawns, White wins if one of the pawns queens and Black wins if he/she can eat all of White's pawns, this can help teach kids the power of passed pawns and the lateral attacks of the Rook.