pinandfork: 1d4 d5 2 c4 Nf6 is best met by 3cd Nxd
4 Nf3 .Now after 3cd Black cannot convert it into Grunfeld Exchange by playing g6 .Because then white will keep the pawn by playing 4 Qa4 + Bd7
5 Qb3 followed by NC3 and e4 which gives a healthy pawn.
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