English Chess Forum

I don't have a grade at the moment as I haven't played for a few years. My grading performance is about 180 over the 15 games I've played this season. Presumably this (roughly speaking) will be my grade when the list comes out? But if I play a 120 grade in my club championship and win, my grading performance will go down?

Is it definitely graded? Not all Club Championships are. It's difficult to say given you're ungraded, because it is subject to my first answer.

then there is an iterative process based on results between ungraded players until the system settles down to consistent grades for everyone?

The only thing I'm slightly unclear on is my games against other ungraded players. Am I right in saying that the "first pass" would give me and other graded players a grade based on our games against graded players (as you mention in your post Alex), then there is an iterative process based on results between ungraded players until the system settles down to consistent grades for everyone?

The first step of the grading process is to calculate an 'initial grade' for new players. This is done in two stages. The first is an iteration using 40 points for a win and ignoring the 40 point rule. The second stage is to use the result of the first stage as the new player's grade and grade his results using 50 points for a win and the 40 point rule. The new player is then treated as a graded player with a grade given by the 'initial grade'.

So, to answer the questions actually asked:-

1. New player loses 10 games to opponents all graded 150
Initial grade Stage 1 gives: 10 x (150 - 40) / 10 = 110
Initial grade Stage 2 gives: 10 x (150 - 50) / 10 = 100
Published grade: 10 x (140 - 50) / 10 = 90

2. New player wins 10 games against opponents all graded 150
Initial grade Stage 1 gives: 10 x (150 + 40) / 10 = 190
Initial grade Stage 2 gives: 10 x (150 + 50) / 10 = 200
Published grade: 10 x (160 + 50) / 10 = 210

1. New player loses 10 games to opponents all graded 150 and wins 1 game against an opponent graded 50
Initial grade Stage 1 gives: (10 x (150 - 40) + (50 + 40)) / 11 = 108
Initial grade Stage 2 gives: (10 x (148 - 50) + (68 + 50)) / 11 = 100
Published grade: ((10 x (140 - 50) + (60 + 50)) / 11 = 92

2. New player wins 10 games against opponents all graded 150 and loses 1 game against an opponent graded 250
Initial grade Stage 1 gives: (10 x (150 + 40) + (250 - 40)) / 11 = 192
Initial grade Stage 2 gives: (10 x (150 + 50) + (232 - 50)) / 11 = 200
Published grade: ((10 x (160 + 50) + (240 - 50)) / 11 = 208