[%c_effect b6;square;b6;type;GreatFind;persistent;true] A good and provocative move, allowing White to advance the pawn to e4.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. g1f3  4... d7d6  5. d1c2  5... e8g8  6. c1d2 