Chess is a scientific game and its literature ought to be placed on the basis of the strictest truthfulness, which is the foundation of all scientific research. — W._Steinitz

A00-A99

A00		Irregular Openings
A01		Nimzovich
A02-A03		Bird
A04-A09		Réti
A10-A39		English
A40		Irregular Queen's Pawn
A41-A42		Modern
A43-A44		Old Benoni
A45-A50		Indian
A51-A52		Budapest
A53-A55		Old Indian
A56		Benoni
A57-A59		Benko Gambit
A60-A79		Modern Benoni
A80-A99		Dutch