Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nf6/3. d4

=Petrov's Defence=

Now, Black has to choose between the two pawns which to capture : /3...exd4/ or /3...Nxe4/. Unless they want to keep on playing a symmetrical game with /3...d5/.

A transposition to Philidor's Defence is possible by the mean of 3...d6.

=Theory table= .

'''1. e4 e5 2. Nf3 Nf6 3. d4'''