Watson crushes the competition in second round of 'Jeopardy' 15 years ago
To make it a true test of brains, and remove the mechanics of button-pressing speed from the question...
Place all three contestants in isolation from each other.
All three hear the question read, and buzz-in just as they do now.
Allow ALL contestants who buzz in to answer the question, but do not allow them to know about their opponents' performances.
Record all contestants' buzz-in reaction times.
At the end of the game, compare only the accuracy of answers to determine the winner.
At the end of the game, compare buzz-in reaction times to see how thumbs fare against relays.