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
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Slav defence D17 Central variation
7. Nxc4
White recaptures the c4 pawn.
Black can now choose to either enter the Carlsbad variation with 7...Qc7 or to transfer the knight to b6 with 7...Nb6.
Theory table
Carlsbad variation 7...Qc7 8. g3 e5 7...Nb6
References
See also