Conkers is a traditional children's game in Great Britain and Ireland played using the seeds of horse chestnut trees—the name 'conker' is also applied to the seed and to the tree itself. The game is played by two players, each with a conker threaded onto a piece of string: they take turns striking each other's conker until one breaks.
You are very welcome sir. I must say I'm not English, I'm Spanish actually. Congratulations on your Street Coder book, sounds like great reading material for junior engineers, I'll give it a read, seems promising. Regards.
https://en.m.wikipedia.org/wiki/Conkers