[%c_effect c5;square;c5;type;Interesting;persistent;true] By now we are used to queen's pawn sidelines in world championship matches. Both Ding and Ju showed that this is just as viable a path as fighting for advantage in the main lines.
1. d2d4  1... d7d5  2. g1f3  2... g8f6  3. e2e3  3... c7c5 