The game of Chess is shown at least once ✣ in the chronicles, as a game Moxana plays, and appears to be played by the same rules in Europa Wulfenbach as on our world. The next page ✣ uses the term "check".
Other references to chess include the ultimate endgame chess ✣ set that Zola was rescued from, and the Knights of Jove clanks shaped like chess pieces ✣ .