411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Qe7/3. d4/3...d6
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
After 3...d6, Black may get a semi-decent position if they play accurately. They might also consider moves like 4...Nc6 or 4...Nf6.
1.e4 e5 2.Nf3 Qe7 3.d4 d6