Morelli game #1836261

Came across this intriguing 9x9  between R56ygf v zeder.  Finely balanced endgame, as far as I could see, so couldn't for the life of me  figure out why it ended in a resignation.  Would be  very interesting to hear the insider take on that, if either or both of the protagonists were happy to discuss.

https://littlegolem.net/jsp/game/game.jsp?gid=1836261

Thanks, purgency.  Very helpful.  I'm real rubbish at stuff like links!

I think it's because black seems to secure the top-right quarter. There's still possibility for a draw though, so maybe it's more due to the psychological effect of losing 2 stones at move 23 for white.