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
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Grünfeld Defence rd nd bd qd kd bd rd pd pd pd pd pd pd pd pl pl nd pl pl pl pl pl rl bl ql kl bl nl rl
5...Nxc3
This is forced, as Nb6 and Nf6 lost time, and Nb4 lost to Qa4+ Nc6 d5. Now, Black appears to have improved White's center, but weakened the long diagonal when Black plays Bg7. Black will play ...Bg7 and ...c5 soon after.
Theory table
+67bxc3
Bg7Nf3
c5=