Be careful with New Zealand rules!
I saw such games before, played by sum on KGS (Robert Jasiek,5d from Germany), but it's the first time I saw 8-9 dan players, using New Zealand rules.
Maybe W thought that he is playing with regular Japanese rules, so after playing all "useful" moves he played pass. Black got 1 extra dame point, because of this pass and won the game by 1 point
Ilya Shikshin (roln111) was lucky!
Maybe it's a good idea to delete New Zealand rules from rules selections on KGS. What do you think?