Sensei's Library (commonly referred to as SL among Go-players) is an Internet website and wiki, dedicated to articles about, and discussion of, the game of Go.
[1] Hollosi is also known for designing version 4 of Anders Kierulf's popular SGF file format and for his work with the Austrian Citizen Card project.
[2][3] Sensei's Library is used for a number of purposes, and contains over 26,000 pages [4] on a wide range of topics, such as the culture and history of Go, Go theory, strategy, and community information.
Articles cover a variety of topics, including possibly the best discussion of endgame theory published anywhere.
"[5] Among its contributors are some published Go authors, such as Charles Matthews and John Fairbairn.