411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...c6/3. Nc3/3...Nf6/4. Nf3/4...e6/5. e3/5...Nbd7/6. Bd3/6...dxc4/7. Bxc4
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Meran variation D47-D49 Semi-Slav
7. Bxc4
White recaptures the pawn.
/7...b5/ is the most proper response, justifying the loss of control over the center by making the b7-square available for the light-squared bishop while gaining a tempo.
Theory table
7... b5 8. Bd3 7. ... ... 8. Be2 7. ... ... 8. Bb3
References
Semi-Slav Defence Meran Variation: 6.Bd3