Since 1987 we have defended in articles that the
Spanish queen Isabella I of Castile (Isabel la
Cat—lica) 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.