Wikipedia
Blindfold chess (also known as sans voir) is a form of chess play wherein the players do not see the positions of the pieces or touch them. This forces players to maintain a mental model of the positions of the pieces. Moves are communicated via a recognized chess notation.
Blindfold chess was considered miraculous for centuries, but now there is greater recognition of people who can keep track of more than one simultaneous blindfolded game. In simultaneous blindfold play, an intermediary usually relays the moves between the players.
Usage examples of "blindfold chess".
Blackburne, whose 27th birthday had been celebrated just the day before, had already been playing blindfold chess for seven years.
Grateful at last to have found something to talk about, he launches into a long dissertation about the Musikalisches Opfer's six-part fugue, which Bach is supposed to have improvised on the spot for King Frederick the Great, a feat equivalent to playing and winning sixty games of blindfold chess simultaneously.
It was blindfold chess, played with imperfect knowledge of the initial position.
It wasat least no worse than the terrible games of blindfold chess herfather had once made her play with him, as a way of training hermind and memory.