2.c4 is the Reti Opening or English Opening. 1...c5 Black invites White to play 2.e4, transitioning into the Sicilian Defense, or 2.c4, the Symmetrical Defense of the English Opening. 1...g6 White can play 2.c4 for the English Opening, 2.e4 for the Sicilian Defense, 2.g3 for the King's Indian Attack, or 2.d4 for the King's Indian Defense. 1...e6 Like White's move, Black's move is non-committal as to opening. White can play 2.c4 for the English Opening or 2.e4 for the French Defense (if Black plays 2...d5) or the Sicilian Defense (if Black plays 2...c5). Another non-committal move for White is 2.d4, which can lead to the Sicilian Defense, the Queen's Gambit Declined, the Dutch Defense, the Indian Defenses, the King's Indian Attack, or the London System, depending on Black's reply. 1...f5 After 1...f5, 2.d4 is the Dutch Defense. 2.e4 borrows ideas from the Staunton Gambit. See also List of chess openings References Further reading Chess openings