Once in 960 times, chess960 should just be the same as regular chess. Are there any known instances of this? Or is this selection automatically excluded and they just roll the dice again? So is it really "Chess959"?
EDIT: Found this: https://lichess.org/forum/lichess-feedback/chess960-starting-position-518-is-like-regular-chess. An online player complains that he has faced the dreaded 518 two times. And why not? My golfing uncle hit two holes-in-1 during his career, and that’s got to be a lot less likely than 1 in a thousand!
But I think that Chess960 can’t be that popular at top levels or there would be a celebrated example where GM X faced GM Y over a 518 Game Array.