I am a European (UK) 2 dan, 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). 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 I have also done unpublished work in the topology of Go, and have dabbled in the Rules Of Go.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". Other people whose work specially interests me are Ger Hungerink, Matti Siivola, Bill Spight, Elwyn Berlekamp, Denis Feldmann (aka F3etoiles), Robert Pauli, Fred Hansen?, and Robert Jasiek.