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  7. e1g1  7... f8e8  8. d2d3  8... c6d4 \"I was out of book—I did not know what to do.\" (Korobov) 9. f3d4 This turned out to be a novelty. 9... e5d4  10. c3e4  10... f6e4  11. d3e4 An unusual situation has arisen. Both central pawns are doubled and weak, and both sides try to attack them as soon as they can.