The manuscript is exclusively devoted to modern chess (using the modern rules of movement for the pawn, bishop, and queen, although castling had not yet taken its current form), and no mention is made of the earlier form. The rules are not explained, so the manuscript must have been written at a time and place when the new rules were well established, or it was addressed to a player familiar with the new rules. The addressee of the manuscript is not named, but was evidently a nobleman of high rank.[3] Some particulars of the manuscript suggest that the author was from Spain or Portugal and that it was copied at some point in France, although this is not certain.[4]