1. c2c4  1... e7e5  2. b1c3  2... f8b4  3. d1b3 [%cal dd1b3][%c_arrow d1b3;keyPressed;none;from;d1;opacity;0.8;to;b3;persistent;false] \"A modern line and the first line of some chess engine.\" (Korobov) 3... a7a5  4. g2g3  4... g8f6  5. f1g2  5... e8g8  6. g1f3  6... b8c6 