I sometimes like to seed a little something from the world of the weird.
I came across a reference to a phychic who channeled a game with a dead Grand Master, but with no names mentioned.
Well, AHA! There WAS a game between a dead Grand Master and the living player was no less than Victor Korchnoi. Hard to think that a legend like Korchnoi would be bothered with a fake medium.
The game took 7 years due to the slowness of transmitting plays from the deceased Maroczy to the traveling Korchnoi.