
1) Traditional board game
Found on
https://www.crosswordclues.com/clue/rithmomachy

Rithmomachy (or Rithmomachia, also Arithmomachia, Rythmomachy, Rhythmomachy, or sundry other variants; sometimes known as The Philosophers` Game) is a highly complex, early European mathematical board game. The earliest known description of it dates from the eleventh century. A literal translation of the name is `The Battle of the Numbers`. The......
Found on
http://en.wikipedia.org/wiki/Rithmomachy
No exact match found.