411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...Nf6/2. c4/2...g6/3. Nc3/3...d5/4. cxd5/4...Nxd5/5. e4/5...Nxc3/6. bxc3/6...Bg7/7. Nf3
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Grünfeld Defence
7. Nf3
This move starts a piece setup that has become increasingly popular since the 1980's. White moves their knight to an active place. The drawback is that the bishop will have to settle for the passive e2-square, else Bg4 would be strong.
Theory table
7. ... c5
See also
Grünfeld Defence