1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... a7a6  6. d1d3 A very rare  line, also played by Carlsen against Grandelius in this tournament. It has recently been tested by Fedoseev, and before that it was brought briefly  into the spotlight by the creative Spanish GM Vallejo. It should be  mentioned that the Dutch GM had tested it in the distant 2014. 6... b8d7 