I remember an article in a Go World that tried to quantify how many points various (joseki?) mistakes made, and thought it would be interesting to apply that idea to a whole game and see if the sum of the mistakes ends up near the actual game score. For example, I think pretty much everyone above 10 kyu could identify this block of
as a mistake in direction as there is no extension stone around the marked point yet, but I've seen dan players play this way. Assuming the rest of the game was played perfectly, how much would black win by? Two points, 5 points, 10 points? My feeling is maybe 3-4 points. Perhaps monte carlo bots could give some insight here, though their play is far from perfect 
.To stimulate discussion, here are two games of mine, both ending in resignation but with a fairly easy to count position, the first me losing to a player around the same strength (in fact I posted this game for analysis at viewtopic.php?f=4&t=8310) and another beating a weaker player by a wider margin. My suggestion is to go through the game, identifying mistakes from both sides and assigning a point value to them, and then sum up the totals to see the "mistake score" (I will use the convention that black's score is positive, so mistakes from black are negative and from white positive). Then actually count the position and see how close they are. Of course some(most?) mistakes are really hard to quantify and it's hard to know what the current score is, for example in the 2nd game is the lower side really my territory? If up until his invasion we count yes and white is leading 30 points in the mistake count, but then we realise black could have found a living sequence then that mistake is like 40 points but that doesn't mean the score at the end is white by 70. Also what about a mistake that goes unpunished? Should you count the mistake assuming the opponent punishes correctly, and then when they don't put the same amount back? I leave it up to you as this isn't meant to be rigourous, just some interesting fun.
Game 1:
My mistakes count:
Final score:
Game 2:
My mistakes count:
Final score:
. 
was a mistake. Better jump out, or possibly make a double kakari.
What this exercise needs is a good ddk game. Volunteers?
and 
from an even position.