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. e3/6...e6/7. Bxc4/7...Bb4
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Dutch Variation D18-D19 Dutch Variation Euwe Variation
7...Bb4
Black develops the bishop to its most natural square.
White should simply castle kingside /8. O-O/ to get out of the pin and start preparing e4.
Theory table
8. O-O +
References
See also