I remember when I saw George Koltanowski perform a blindfold exebition in San Francisco in the 1950's. I joined his Presidio chess club and he became my friend.

He performed this Knights tour many times each in different ways.

I still have two wind up time clocks. I have the books that he gave me when I won sections of tournaments. They are in descriptive notation. I can actually read them.

Here is a photo of Geo Koltanowski facing the corner, playing eight boards blindfolded. In Brazil  1948.