How could expert chess players play a chess with their eyes closed?
Most scientists attribute extraordinary memory performance to an enhanced ability to associate or organize the information to be memorized, rather than true photographic memory. For example, many expert chess players possess a remarkable capacity to recall the position of chess pieces at any point from a game. The ability to retain an accurate mental image of the chessboard permits these players to play multiple boards at a time ― even while they are blindfolded!
I wonder why "even while they are blindfolded" appears in a logical aspect. How could expert chess players play a chess with their eyes closed? I don't understand it.
please help me!