411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...g6/2. d4/2...Bg7/3. Nc3
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Modern Defence, Main Line rd nd bd qd kd nd rd pd pd pd pd pd pd bd pd pd pl pl nl pl pl pl pl pl pl rl bl ql kl bl nl rl
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/ while a risky approach is /3...c5/.
Theory table
1. e4 g6 2. d4 Bg7 3. Nc3
+ 3 4 …d6 Be3a6 equal …c6 Nf3 equal