The alliances were like this.
My allies == Korx, Thalan
Korx == me, Thalan, Yor
Thalan == me, Korx, Yor
Yor == Thalan, Korx
Since I was not allied with the Yor, I dont qualify for a diplo victory. But both the Thalan and the Korx do.
I will send the saved game shortly, just as soon as I figure out how.
A Diplomatic victory is easy enough to prevent, just dont be allied with someone, and they cannot win. But if your ally is also allied with everyone else, then they should win.
END COMMUNICATION