This move leads to a passive position of the Schlechter Defense with the pawn advancing to e6. Of course, advancing the pawns to e6 and g6, especially at the beginning of the game, is not so logical. Both moves have the same main objective: to free the bishop's path. The great merit of this move, and to be honest perhaps the only one, is taking Caruana out of his usual high-level preparation. It must be admitted that Rapport's strategy will have some success.
1. d2d4  1... g8f6  2. c2c4  2... c7c6  3. g1f3  3... d7d5  4. b1c3  4... e7e6  5. e2e3 