Chess Opening Theory/1. e4/1...c5/2. Nf3/2...Nc6/3. d4/3...cxd4

Moves:1.e4 c5 2.Nf3 Nc6 3.d4 cxd4

This is the main line.

Theory table
1.e4 c5 2.Nf3 Nc6 3.d4 cxd4