His book about games of chance , Liber de ludo aleae , written in the NUMBER@1 , but not published until NUMBER@2 , contains the first systematic treatment of probability , as well as a section on effective cheating methods .

A book of his , called Liber de ludo aleae -LRB- aproximately translates to as Book on the game of chances -RRB- contains the first systematic treatment of probability , as well as a section on how to cheat .
