First of all I am not wrong, What I said is the quitter is always the one who looses the match, the other player wins, as opposed to what was being said by Anna_K.
The extent of victory is another problem.
It is not always +1 as you suggest here, but the system takes into consideration a couple of other circumstances as well.
However, there is no perfect solution. If the system gave (and took away from the "quitter") too much too easily, you would complain if you dc unintentionally and loose a lot of points not from your own fault.
Just think about it: If you have 7 stones in the house, the opponent say 2, in better position, guarded by other stones. And you have the hammer. Opponent quits/disconnects. Theoretically it could have been a +8 for you, but I do not think this would be fair to give +8 either.
Unfortunately we cannot have an umpire for each match, so there has to be some well defined scoring system, which is applicable for ALL of the matches. Naturally there will be instances when one of the player will find it unfair.
If you have a better idea, than the current one, make a proposal.
OP