White has set up a powerful pawn center. It's time for Black to counter-attack. 2...d5 is the main line and generate tension on both pawns. 2...e5 can transpose into the Scotch Game, but other continuations are also possible, either a center collapse after 3. dxe5 or a closed game after 3. d5.
1. e4 Nc6 2. d4
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- Batsford Chess Openings 2 (1989, 1994). Garry Kasparov, Raymond Keene. ISBN 0-8050-3409-9.