Chess Opening Theory/1. e4/1...g6/2. d4/2...Bg7/3. Nc3

Modern Defence, Main Line
This the main line of the Modern Defence. Here Black has allowed White to have a classical pawn duo on e4 and d4. Black must have a plan to attack back or they will be steamrolled.

The most common reply is /3...d6/. Here Black attempts to undermine the center through a hypermodern approach.

A more passive approach is /3...c6/.

Theory table
'''1. e4 g6 2. d4 Bg7 3. Nc3'''