One of the many aggressive attempts to gain more than positional compensation for the pawn in these lines.
1. d2d4  1... d7d5  2. c2c4  2... c7c6  3. g1f3  3... g8f6  4. b1c3  4... e7e6  5. g2g3  5... d5c4  6. f1g2  6... b8d7  7. e1g1  7... b7b5  8. e2e4  8... c8b7  9. e4e5  9... f6d5 