References to ease looking up the games referred to in this book in a games database. Useful if you want to follow the book commentary on your computer.
References starting with 'g' are identifiers in the GoGoD database, 's' ones are in the SmartGo database. (The intention is to be able to include references to other databases too.)
p23 g1933-10-04a, s1933-10-04na
p30 g1942-07-01a, s1942-07-01nb