1. g1f3  1... d7d5  2. g2g3  2... b8d7 A tricky move order which aims to secure the long  diagonal for the light-squared bishop. 3. c2c4  3... d5c4  4. d1a4 Without a  check. 4... a7a6  5. a4c4  5... b7b5  6. c4c2  6... c8b7 Once upon a time the seizure of  this diagonal was considered good enough for equality. Nowadays White  tries to squeeze something out of the position. 7. f1g2  7... g8f6  8. e1g1  8... e7e6  9. d2d3  9... f8e7  10. a2a4  10... c7c5  11. b1c3  11... d8b6  12. a4b5  12... a6b5  13. a1a8 Artemiev secures the a-file before his opponent finds the time to finish the development.  Another question is how valuable this file is, as long as there are no  entry squares along it.