411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...c6/3. Nf3/3...Nf6/4. Nc3/4...dxc4/5. a4/5...Bf5/6. Ne5/6...Nbd7/7. Nxc4/7...Qc7
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Slav defence D17 Central variation
7...Qc7
Black develops the queen to c7 in order to prepare e5. This will likely lead to the Carlsbad variation.
White's main response is 8. g3 preparing to develop the dark-squared bishop to f4 where it can put pressure on the knight after 8...e5 9. dxe5 Nxe5. This also prepares to fianchetto the light-squared bishop.
Theory table
8. g3 e5 9. dxe5 Nxe5 10. Bf4 Carlsbad variation
References
See also