Play against the English opening
Depends what u play against d4
It's quite relevant what you play against 1.d4, for what you might choose against 1.c4. Against several defenses to 1.c4, white can still choose to transpose to 1.d4 positions, so if not careful can be move order tricked into playing opening don't play. The exceptions would be 1.c4 e5, or 1...c5. If play something like the KingsIndian or QGD against 1.d4, black can save work heading for these openings against 1.c4. If white decides to say in english lines, the nature of play is quite similar or promising for black.
Depends on my mood that day. I play either 1...b6 (English Defense), 1...Nf6 (Speaking as a King's Indian player) and 1...f5 (Also play the Dutch).
I don't push the e- or c-pawn one or two squares against the English, which are four other popular responses along with 1...g6.
I would try 1-...g5. A reverse grob variation against sicillian defence.
1. c4 g5 is the Jaenisch Gambit, and is a ton of fun, if fairly unsound.
Possibly helpful:
Beating Unusual Openings by Richard Palliser (2006)
https://web.archive.org/web/20140627072813/http://www.chesscafe.com/text/hansen107.pdf
Grandmaster Repertoire 19 - Beating Minor Openings by Victor Mikhalevski
http://www.qualitychess.co.uk/ebooks/BeatingMinorOpenings-excerpt.pdf
http://www.davidsmerdon.com/?p=1888
