How good at chess was Carl Friedrich Gauss?
"... Carolus Fridericus Gauss; (30 April 1777 – 23 February 1855) …"
https://en.wikipedia.org/wiki/Carl_Friedrich_Gauss
GWTR, that was some droll wordplay, but it does state on the ChessManiac website that Gauss did play chess in his spare time. However, I believe he was not at competition level, though he might have had the potential to become so. After all, he had rather phenomenal mathematical aptitude.