Chess Opening Essentials, Volume 4 - Dimitri Komarov, Stefan Djuric, Claudio Pantaleoni

1.c4 / 1.Nf3 / Other First Moves: Chess Opening Essentials is an accessible primer and a reference book at the same time. It gives a flavour of how every opening works and explains the similarities with other openings as well as the differences. In addition, it also points at the various middlegame plans that apply after the opening has ended.