Lines and Numbers

Posté par northlecale le 3 août 2016

The EGD has a Calculator to find rating(GoR) change after any tournament. At the moment, there are at least 2 variations of the rating system with regards to tournament results submission. This means that you can have a different exit rating depending on the country you play in. To show this, we will look at an improving player with an out of date rank – of course he could also be a total sandbagger. His last rank was 10-kyu so he enters at this rank, but actually he is 2-kyu online (about 1800?). Thus he smashes up his opposition – that is he wins 5 games out of 5.

Scenario 1 is the straight up normal mode of operation.

Round Opponent P.Change O.Change
1 1000 +35.6 -34.4
2 1100 +46.5 -42.1
3 1225 +57.3 -47.1
4 1350 +63.9 -47.6
5 1500 +67.9 -44.8

Thus our player (P) moves his rating from 1000 to 1271.2. Notice that opponent 5 loses less GoR than opponent 4. At first sight this seems illogical, but there is an explanation. This is because opponent 5 is in a higher rating bracket, thus his modifier is lower. The total loss in rating for the opponents is 216.

Scenario 2 is where either the Tournament Director, the EGF Member (e.g. Finland’s or France’s Go Association), or the EGD administrators themselves look at the results, decide that (P) needs his rating changed, and do it. Let us pretend his rating is changed to 1300 by one of these three entities before they enter the results into the database. That is, they alter the tournament data before submission.

Round Opponent P.Change O.Change
1 1000 +7.4 -8.3
2 1100 +11.9 -13.0
3 1225 +20.9 -21.4
4 1350 +32.8 -30.8
5 1500 +44.8 -37.5

Thus our player (P) moves his rating from 1300 (or perhaps 1000) to 1417.8. The total loss in rating for the opponents is 111.

Here I do not say which system is better. I only want to say that after all these years we should have only one system, i.e. one complete end to end method of working, in the European Go Federation. One system which we all accept and agree to use. If we do not, then the ratings between one country and the next might not be the same. That is inherently a bad thing for rating integrity.

Publié dans Baduk, Go, Weiqi | Pas de Commentaire »

 

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