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Chess Opening Theory/1. e4/1...e6/2. d4/2...d5/3. exd5/3...exd5/4. c4
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Monte Carlo Variation rd nd bd qd kd bd nd rd pd pd pd pd pd pd pd pl pl pl pl pl pl pl rl nl bl ql kl bl nl rl
Monte Carlo Variation
By playing 4.c4, White gains some space at the expense of not being able to defend the d-pawn. This move also tries to destabilize the d5 pawn, and open up a line for the bishop.
Common responses by Black include Nf6 which guards the pawn and develops a knight, c6 also guarding the pawn, just taking the c4 pawn with dxc4, or Bb4+ to gain a tempo on the white king and develop a bishop.
Theory table
.
1.e4 e6 2.d4 d5 3.exd5 exd5 4.c4
4
5
c4Nf6
Nc3Be7
=
...
c6Nc3
Nf3=
...Bb4+
Nc3Ne7
=
References
French Defence