Tools for Stringing Conkers. (XCalPab, 2009)

As I mentioned previously, horse chestnuts have an even more commonly known purpose: the game of Conkers. In England, where the tree is found abundantly, school children scour the ground, and even the trees themselves, in autumn, filling their pockets with as many of these tiny nuts as they can find. Then, they thread them on strings and the fun begins. The game Conkers, which originated in Britain sometime after the horse chestnut was introduced, consists of two players, each with his or her own horse chestnut, or “conker,” threaded on a string. One player will dangle his conker from the string, and the opposing player swings his conker, aiming at the other player’s. Players take turns, and whoever breaks the opponents conker first is the winner.

More detailed instructions on how to play conkers, and information about the World Conker Championships, can be found at: 
http://www.worldconkerchampionships.com/html/conkers_about.html