@vendasaid I imagine it would take quite a lot of practice.
Well, yeah. But "experienced" and "quite a lot of practice" are more or less the same thing, aren't they?
Even I can play my favourite openings blindfold for quite a few moves. A whole game is another matter, but then, I've never had occasion to try in earnest. Still, if as bad a player as I can play a serious line blindfold for more than a few moves without seriously trying, it should come as no surprise at all that even a halfway decent player can play a whole game blindfold with practice.