Werner’s own blurbs
Running chess on a smart card
Due to my work with smart cards I recently came across a little pet project named SmartChess which succeeded to implement chess software on a smart card. If you are interested in chess and very small CPUs you might want to have a look at it.
It is not pure coincedence that I noticed this project: Achim actually helped me to get the smart card support for GnuPG going by writing up a spec, answering numerous questions of mine, testing and actually providing cards.