I bought this book in the early 1970s and underlined it extensively. I recently picked it up again to update my own book on strategy, just to ensure I didn't leave anything out.
There are many interesting scenarios detailed in the book, and the editorial reviews nicely overview the moves and counter-moves. However, given that I dogeared the page of my favorite comment, I thought I'd quote the important lines here: "He [the game player] should exhaustively enumerate the distinctively different courses of action open to the opponent as a response to each of his own possible moves, and in light of these settle on his own best course of action." While this may be obvious to some, it's an important concept no successful strategist can forget and one he might often need to accomplish through writing/recording and diagramming.
Bottom line from a fellow author, Goffman's book is an excellent and classic work on strategy as viewed through game theory!