1. d2d4  1... d7d5  2. g1f3  2... g8f6  3. c2c4  3... c7c6  4. e2e3  4... e7e6  5. b1d2  5... f8e7  6. b2b3  6... e8g8  7. c1b2  7... b8d7  8. f1d3  8... d5c4 [%c_effect c4;square;c4;type;Interesting;persistent;true] Black usually delays this capture and plays b6, but there's nothing wrong with it.