I'm pleased to present you today a complete repertoire after 1. c4. I've chosen e5 as an answer by process of elimination. And my conclusion is that the reversed sicilian is maybe black's soundest and most logical answer to 1. c4
Black contests the center in a classical way and seeks strong and powerful central play. It looks like it's a sicilian defence with one tempo less, but some particularities that it does not lead to a big advantage for white as we might suppose. Why? Because black has more information. It is a very important feature in reversed openings.
They were amazing match-ups featuring this openings and it gives chances for black to win, which is rare against the English Opening.
Specialists of this line include Anatoly Karpov, Michael Adams, Nigel Short, Paul Keres and Vasily Smyslov
I will use as main reference 'Gambit Guide to the English Opening with ...e5'
May this repertoire serve you well in your own games,
After <1. c4 e5>, white has a few choices which leads to different kinds of position. Pawn structure is an extremly important aspect of the position
I) The stereotypical g3 development <1. c4 e5 2. g3 Nf6 3. Bg2 c6!>
III) The Odd 2. Nf3 line <1. c4 e5 2. Nf3 e4 3. Nd4 Nc6>