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I'm lloking at 1. e4, e6; 2. d4, d5; 3. e5, c5; 4. Nc3. Of course, 4...cxd is best as it asks questions at once! 4...Nc6 is not any bad move, but it isn't forcing and allows White to try something like 5. Nf3, cxd; 6. Nb5 (or perhaps even e2!). 4...cxd threatens ...dxc3 - so now what? 4. Qxd4, Nc6 with tempo.
Just 4...cxd and now what?
The interesting alternatives are 4. Nf3 and 4. Qg4, with 4. Bf4 in the hunt, too. Why play c3 when the idea is to keep the blockader on e5? Paging Nimzovitch!