[%c_effect b4;square;b4;type;Interesting;persistent;true] An interesting idea that had already been played by Van Foreest.
1. c2c4  1... e7e5  2. b1c3  2... g8f6  3. g1f3  3... b8c6  4. g2g3  4... d7d5  5. c4d5  5... f6d5  6. f1g2  6... f8c5  7. e1g1  7... e8g8  8. d1c2 