I love using chess boards. My personal favorite, also stolen from the 7th guest was placing 8 of each piece on without threatening another.
So place 8 rooks on the board so they cannot attack each other. Easy, put them on a diagonal. The Bishops, in a straight line. The knights are fairly easy.
Go try to put 8 queens on a chess board without any of them threatening any other one. After a very enjoyable hour, one player asked if he could make a history check to see if he could remember where some of the pieces went. I gave him 3 pieces. They got it shortly afterward.
If you want the solution, just google 8 queens.
So place 8 rooks on the board so they cannot attack each other. Easy, put them on a diagonal. The Bishops, in a straight line. The knights are fairly easy.
Go try to put 8 queens on a chess board without any of them threatening any other one. After a very enjoyable hour, one player asked if he could make a history check to see if he could remember where some of the pieces went. I gave him 3 pieces. They got it shortly afterward.
If you want the solution, just google 8 queens.