This book is a complete Black repertoire starting 1.e4 e5 2. Nf3 Nc6 3. Bb5 a6, the exchange variation being the first chapter.
It provides you with a lot of insights into this remarkable variation, the Ark, and entertains the reader with spectacular, resourceful lines to illustrate the ideas.
This book should also be interesting for those who just enjoy chess in general, not just for the fans of this line seeking new ideas!
You don’t need to memorize everything to be able to play the variation successfully.
Longer lines merely tend to be examples of how the game might develop, which help to enhance your understanding.