The chess game had a wide diffusion during Renaissance. It was introduced in Italia by the arabs who knew it from the persians and indians.In the Renaissance it was a metaphor of the World.So, contemporaries of the manuscript have the objective knowledge to interpret the staging retonseepatirn.I think that we have here a scene representing the power and wealth of a couple that was given by god, and illustated by the latin inscriptions.The jewels are the signs of the couple's power and the book should be then the same as photos are today.