The Renaissance manuscript on the game of chess kept in the Coronini Cronberg Library only in 2006 was recognized as an autograph work by the famous mathematician Luca Pacioli. The small leather-bound codex was immediately related to the treatise, entitled De ludo schacorum known as Schifanoia, for centuries considered completely lost, which Pacioli intended to dedicate to the marquises of Mantua Federico Gonzaga and Isabella d'Este and for which he had requested in Venice the privilege of printing in 1508. The drafting of the work was certainly already underway from 1496 to 1499, during the period that Luca Pacioli spent in Milan at the court of Ludovico il Moro, where he met Leonardo da Vinci, destined to lead to a long and fruitful friendship, as well as a professional collaboration. It is well known that the invention of the magnificent drawings of solids and polyhedra that illustrate the De divina proportione, the work dedicated to the golden section that Luca Pacioli completed in Milan.