The tech is there, but the risk is insanely high, and it isn't easy.
It is extremely easy to cheat online. You just open an engine on your computer.
For OTB, you'd have to be really sophisticated, and most likely have a partner assist you. And you still have to be really, really good at chess - Hans, even if he's cheating, is still a 2600 rated player.
It is several orders of magnitude harder, so way less opportunity, and the risk is much, much higher. Hans would have to have nerves of steel, for sure, to pull it off. Not saying it is impossible.
It is extremely easy to cheat online. You just open an engine on your computer.
For OTB, you'd have to be really sophisticated, and most likely have a partner assist you. And you still have to be really, really good at chess - Hans, even if he's cheating, is still a 2600 rated player.
It is several orders of magnitude harder, so way less opportunity, and the risk is much, much higher. Hans would have to have nerves of steel, for sure, to pull it off. Not saying it is impossible.
But there's no evidence he cheats OTB, either.