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2…d5 3.Nd2 c5: when …c4 lets go of d4
2…d5 is the reply you see most: 201 games, 60%. After 3.Nd2 c5 4.e3 Nc6 5.c3, Black goes after b2 in turn.
Recall: in the b2 gambit, which square must the g1 knight hold before you play e4?