During the Middle Ages and the Renaissance, Rithmomachia was one of the most popular games played in the universities and theological schools and promoted by Roger Bacon and Thomas More. Today, it has fallen into obscurity.
Links:
Wikipedia has a good simple presentation of the basics of rithmomachia
Here is a Renaissance presentation of rithmomachia
Rules for playing rithmomachia can be found here and here
For the really adventurous, here are the rules of Boolean rithmomachia
Computer [Java] versions of rithmomachia can be found here and here
Rithmomachia boards and pieces can be purchased here and here
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Be sure to check out the CUTH blog for more on the history of the Catholic Church
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