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
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Slav defence D17 Central variation
6...Nbd7
This is a simple developing move. White's only real follow-up is 7. Nxc4, keeping the knights in the center and recapturing the c4 pawn.
Theory table
Carlsbad variation 7. Nxc4 Qc7 8. g3 e5 7. ... Nb6
References
See also