I'm a little fuzzy, also. I assume anachists would not be in favor of a law like Obamacare because it was imposed on the 49% of the population who were strongly against it. I would assume acarcho-capitalists would have the same conclusion.
I understand the historical relation between anarchy and other leftist politics like socialism and communism. But since anarchists seem to be opposed coercive top-down hierarchies, idealogical or otherwise, I found it interesting that they are considered to be on the left and not outside of left/right politics.
As I'm typing here, headed towards looking up the differences between left and right, I found this: "In both its social and individualist forms, anarchism is usually considered an anti-capitalist and radical left-wing or far-left" [0]
That jives with the overlap I've noticed between anarchists and a subset of libertarians.
[0] https://en.wikipedia.org/wiki/Anarcho-capitalism