[junon]

> has already internalized the mapping from piece shape to movement

Magnus Carlson, considered one of - if not the - best chess players of all time has a famous video of him playing three chess matches simultaneously, blindfolded, and winning all three.

Once you get to a certain point not only the movements but also entire gameplay strategies become internalized.

[WJW]

Not to mention the video where the board is presented in the "wrong" direction, so he enumerates to himself which squares the pieces are on, then closes his eyes so he can see the board clearer.

[NickC25]

The more impressive one is where he's matched up against 10 Harvard Law students simultaneously, and is blindfolded. He won all of the games handily.

Even more impressive, one of the students asked Magnus if he could sign a chess board. Not only did Magnus sign an autograph, he literally annotated the entire game from memory. That is insane to me.

https://www.youtube.com/watch?v=w1Rr4Uq1R-I

[junon]

Holy shit, I missed this one. That's wild.