The Spanish Origin of the Checkers and Modern Chess Game. Volume III.

Since 1987 we have defended in articles that the Spanish queen Isabella I of Castile (Isabel la Catolica) was the new chess queen (dama) on the chessboard.

Other publications were in 1990, 1994, 1997, and 2004. And of course, Marilyn Yalom studied our book during her visit to the National Library in The Hague (Holland) before she wrote Birth of the Chess Queen in 2004.

In her book one cannot see that in 1987, 1990, and 1994 we already published material about Isabel la Catolica (Isabel I of Castile) being the new powerful dama or chess queen on the chessboard.

In other words we can state here that we have been studying Spanish history and its chess literature for over 30 years.

Since 2003 we have also known the development of the new bishop in chess.