Bernice: I didnt look too far but he has only been playing with people from Estonia.....there is a pisipaddy and a pisipaddy2...multi nic? seems a bit strange but he/she might be legit.

Let me tell you something. I'm playing with both elizabeth1932, pisipaddy, sema, NODDY and i can tell you that the playing style is the same, the time where these players are online/offline is the same, the behavior of these players is the same(they never talk a word).
Conclusions are yours.

Yet there is the slight possibility that they might be a couple of friends that come along and decided to play together here. But i doubt because of the playing style which is the exact same for all these 4 players.

And if you look at pmvaht's opponents where he obtained the 3000 rating in Backgammon, you will see that his opponents were the 4 players i have mentioned and been playing.