In the Caruana v Svidler game you showed a drawing repetition ending in Kh2 ..Rh5+ Kg3 ..Rg5+ Kh3?? which wouldn't draw but lose on the spot to ..Rh1+ Qh2 ..Rh5+ winning the Queen outright. White obviously has to play te King back to h2 and not h3 in order to repeat the position safely..