There is also a chess-card-package, that "changes" the game a bit, for example one card says pawns now attack streightforward instead of left/right forward,
such thing added could spice up the game.
The card game supplement is called "Knightmare Chess" and it's really fun.
I had a friend who bought both sets around the year 2000 and we played it a lot at work.
(Hey, I was working 3rd shift in a call center and it was slow at times.)