The History of Checkers (Draughts) - Govert Westerveld - Bog

The modern game of chess started around 1475 in Spain when
the queen and bishop got a much more powerful move. It was
called "Mad Queen Chess".
These new rules quickly spread throughout western Europe and in Spain. The enhanced move for the chess queen started after the coronation of the powerfull queen of Spain Isabella I. The historical records duly note that Queen Isabella I was crowned with the sword of justice raised in front of her, and the sceptre and throne were given to her. This allusion to the real-world event is so clear within the Scachs d'Amor poem to Isabella's actual coronation that the inspiration of Queen Isabella for the new chess queen and powerfull dama of the draughts game is unquestionable. The Spaniards like the Moors, played a game on the board of lines and called it alquerque. The game became modern draughts through being transferred to the chessboard around that time. This book is the result of at least 30 years investigations in the Spanish archives