Chess Opening Theory/1. a4/1...e5/2. a5

White continues marching down the board with the a-pawn. This opening is considered dubious. Black has two options:

• 2...a6, stopping White from advancing their pawn any further, or
• 2...d5, taking the full center, unfazed by White's pawn push.

• Kasparov, Garry, & Keene, Raymond 1989 Batsford chess openings 2. ISBN 0-8050-3409-9.

• Nunn's Chess Openings. 1999. John Nunn (Editor), Graham Burgess, John Emms, Joe Gallagher. ISBN 1-8574-4221-0.

• Modern Chess Openings: MCO-14. 1999. Nick de Firmian, Walter Korn. ISBN 0-8129-3084-3.