A pioneering monograph on an unusual opening (1 d4 d5 2 c4 Nc6); an introduction to a different world of chess, born in the fertile imagination of Mikhail Chigorin. The book is thoroughly and properly researched (pre-database) and full of the author's own insights and analysis; you can tell that he has personally examined every variation.
Chigorin theory has moved since 1981 — due in particular to the many games of GM Morozevich — but Watson's book still stands up in most cases.
It's an admirable piece of work.
