Besides this, move 18, white wanted to open the diagonal for his bishop-queen battery; black’s power was too consolidated, though, for this to be of any advantage – very hard to judge; therefore, I think white would be more accurate with 17.d5 because his capture dxe allows black a free game with ideas of nc5 with a transfer to a home on the d-file. White should be calm and controlling instead of his freeing of black's game, who played cramped with the goal of relief.