I am now a European (UK) 1 kyu, who is interested in strange go positions (beasts) which I have collected into a Bestiary -- not only a Go Rules Bestiary. I have done some research into Seki (especially Hanezeki, generalized to what I now prefer to call "Tail Seki"). My work on seki, and various bestiaries are available via my home page. I have also done unpublished work in the topology of Go, and have dabbled in the Rules Of Go.
I am slightly obsessed by the "Most Difficult Problem Ever" from the Igo Hatsuyoron, especially the pages hosted by Deutsche Go Zeitung, largely due to Thomas Redecker, and Joachim Meinhardt?. This led to a book by Thomas (and Joachim, and myself), published by Brett und Stein Verlag, and called " The Most Difficult Problem Ever, Hatsuyoron 120".
While working on this problem, I was fortunate to discover/invent an intriguing, and counter-intuitive, example of a "simple" Circular Tail Seki (AKA Circular Hanezeki) -- see Hanezeki. In 2020 I created a maximal Circular Tail Seki which contains 14 _necessary_ liberties between two groups.