One of the first chess books I have ever read and it is a gem! Though many of its ideas were a little difficult for me to understand (after all, I was a relative beginner), upon reading and re-reading it I found it to be indispensable. Though the openings are a little out of date, the general advice given, its organisation, and especially sections on tactics and on past and present players are most impressive, as can be expected from a player who was world champion for longer than anyone else (21 years). Recommended for beginner to intermediate players.