ABSTRACT
Expert performance can defy belief. Consider that Timur Gareyev, in breaking the world record for “blindfold” chess, simultaneously played 48 opponents without being able to see their boards, losing only six games. Or consider that Alex Mullen, en route to winning the 2016 Memory World Championships, memorized a deck of cards in 21.5 seconds. Equally astonishing, in 2016, Feliks Zemdegs set the Rubik’s Cube speed-solving record with a time of 4.73 seconds.
