Chess Opening Theory/1. d4/1...d5/2. Nf3

A flexible developing move. While this move usually leads to a Queen's Gambit, it is also used to go into a Colle System—a solid line that prepares e2-e4 earlier and can be more aggressive than the usual lines.

Black can develop a number of ways, though 2...Nf6 is most common due to its flexibility.

1. d4 d5 2. Nf3

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