John does not know the back of his father's hand

Here's a brief description of the contestant's attempt. Someone's probably working writing up more detail!

John started out looking for his father's hand, before opting to spend 700 guesses to eliminate 7 boards. Despite narrowing the odds significantly, and making multiple incorrect guesses on the remaining board (at one point even touching the correct photo), he failed to find the photo of his own hand, and received zero points.

(Written by Taskmaster Wiki contributors)