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Chess Opening Theory/1. e4/1...d5/2. exd5/2...Nf6/3. c4
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Modern Scandinavian B01 Modern Scandinavian
3. c4
As Black didn't recapture the d-pawn straight away, White defends it, hoping to stay up the material.
Black has two main options: to chip away at the pawn chain with 3...c6 or 3...e6.
After 3...c6, White could trade 4. dxc6?! Nxc6. However, although White is up a pawn, this helps Black to develop and Black is thought to have full compensation.
Better is 4. d4 (or 4. Nc3 which will transpose), and after 4...cxd5 the position has transposed into the Panov-Botvinnik attack in the Caro-Kann. Because this line used to be considered better for White, 3. c4 used to be the overwhelming choice of strong players. It has fallen out of fashion for three reasons. Firstly, because the Panov-Botvinnik is now only considered even. Secondly, 3. d4 became more popular as a serious try at an advantage for White. Thirdly, the rise of the response 3...e6.
3...e6 is the Icelandic-Palme gambit. After 4. dxe6 Bxe6, Black looks for attacking chances, hoping their development lead and an open position will prove an advantage.
Theory table
1. e4 d5 2. exd6 Nf6 3. c4
3456
c6d4
cxd5=
...dxc6
Nxc6Nf3
e5d3
e4=/+
e6d4
exd5=
...dxe6
Bxe6Nf3
Nc6d4
+/-
...dxe6
Bxe6Nf3
Qe7Qe2
∞
References
See also