Oscar Korschelt
O. Korschelt (1853-1940) was the author of the first extensive treatise on Go in a European language (German). This work, originally published in 1880, has been republished in English translation as a book called The Theory & Practice of Go.
Korschelt studied go in Japan with Honinbo Shuho and included much material from Shuho in his book.
There is disagreement as to whether Korschelt's first name was Oscar or Otto. Note: the author's name on the book says "Oscar Korschelt".
Here are are some pieces of the articles (in German) including a lot of sgf-files of the diagrams.
Jared Beck: Yeah! That german page is really cool. I was working through this game from my copy of the book when I found this site. It's so nice to have sgf files when studying a game. I recommend the historical games on this site, especialy
that game, because of the abundance of easy-to-learn-from moves.