computer-go: Semeai graph

["Floris Geerts" <fgeerts@xxxxxxxxx>]

When searching the web using the key words " graph ", " game", and "go", I
got the following two talks given by Katsuhiko Nakamura of Tokyo Denki
University, Saitama, Japan.

 * Seminarji Slovenskega drustva za umetno inteligenco (1999)
   "Graph-Theoretic Analyses of Board Phases in the Game of Go"

 * ACC '99 9th Conference Advances in Computer Chess
   "Analyzing Capturing Races and Seki Situations in the Game of GO by
Semeai Graphs"

This last conference should have its proceedings published in "Advances in
Computer Chess 9", but  this seems not to be published yet (and will
probably be too expensive to buy anyway).

Can someone sketch the basic idea of this approach or point me to some
literature?

Thank in advance,

Floris Geerts