The 47/50 bar for the Overall Progress Prize was actually set in the first competition, it’s just that no one got it. Interestingly, the purse for the prize has doubled from “at least $794,624” to “at least $1,589,248”.
Perhaps intended as an Easter egg, those numbers are equal to 97*2^13 and 97*2^14, respectively.
I assume 97 <- 47+50? (although I'm not sure where the 13 and 14 respectively come from)