On Jun 7, 1:23  ͼ 
> > What determines the best pairing? A score will be calculated for your output
> > against the input. For each player, the partner is found in the player'srdered list, as an index. So, for the above example:
>
> > David: 0
> > Helen: 0
> > Joseph: 0
> > Vicki: 2
>
> What is the penalty for "unwanted" pairings, e.g.
>
> David: Helen Vicki
> Helen: David
> Joseph: Vicki Helen
> Vicki: David
>
> with output:
>
> David Joseph
> Helen Vicki
>
> Or is the list of preferences always complete, i.e. it always contains
> all other players?

Yes, always complete, the least preferred players will be toward the
end.