E Michael White wrote:Roger
I read it that:- If all the opponents of an ungraded player are graded the results don’t go through step 2 but the "starting grade" is fed into the "grading proper".
That actually makes sense as 10% and below or 90% and higher scores are presumably not uncommon, whilst really strange grades relatively infrequent. I think the investigations of two years ago seemed to indicate that you also needed a fellow ungraded player to get the instability. Examples of relatively low graded player in opens are quite common. Whilst it can be good for their experience, whether it's good for their grade is unclear. So the example of playing 4@175 and 1@150 is likely.
In terms of the arithmetic, if you play 4*175 and 1*150, that's 850 points. Double it for two tournaments and that's 1700. So if you scored 50%, your performance grade would be 170. If you score 8 losses and 2 draws, you subtract eight fifties, so 400. Thus your performance is 130. Lose all ten and the performance is 120. That's ignoring the 40 point rule of course.