A coach will really help. Once you get into the 1400+ range you're probably ready for one if you can afford it. On the other hand I know many class A players and experts (myself included) who did it without a coach. In fact many masters can tell the same story.
PS: I just started reading 'How To Reassess Your Chess' by IM Jeremy Silman... phenomenal book (so far!)
I play chess for ages, but never took it seriously.
Lately, I began to study online resources and chess books about the game. Total addiction.
I'd like to ask experienced players their opinion and thoughts about becoming good (lets say an A class player, maybe a candidate master) only by studying books and playing with computers or do you consider a coach to be 100% necessary?
(In martial arts for example, book learning without a real life trainer is a recipy for disaster...)
thanks folks