Author: James T. Walker
Date: 07:58:30 01/05/00
Go up one level in this thread
On January 04, 2000 at 19:36:54, Mike S. wrote: >On January 04, 2000 at 17:51:40, James T. Walker wrote: > >>(...)Junior won the match >>20.5 to 19.5. When I added the 40 games to the database and clicked on "Create >>ELO Start List" to my surprise, Fritz was rated higher than Junior. (...) > >This sounds surprising to me also at a first look. But there may be an >explanation: If you let calculate a starting list, every player's rating is set >to 2400 at first - but there is a minimum of games for a player to get rated I >think. If some of Junior's opponents, from the earlier games, didn't reach this >minimum (or had very low ratings), then it's possible that Junior therefore gets >a low rating himself. His opponent's average may be much lower than Fritz' in >your database. >I would try the following: Make a database like it was before (without the Fritz >6 games), and make a elo starting list. Set the resulting ratings into the games >(menu item "set elos in games"). Add the Fritz 6-Junior match to the database. >Mark only these new games in the list and choose "add to elo list". >I did not simulate this whole process on my computer, but it should take the >former rating of Junior as a basis, although it could be reduced a bit if the >percentage is lower than before. Please backup everything before you try... > >Regards, >M.Scheidl Hello Mike, First of all the average rating is set to 2350 in the Chessbase GUI's. I don't know why since the only mention in the original manual talked about 2400 as the assumed average rating. You can prove this by playing a match between two players and after calculating the ratings for each you will see the average is 2350. I forgot the minimum number of games required for a rating but it is very low (3/4 games). I don't have any such "Players" in my database but if I did they would simply be ignored untill they had the minimum number of games to be calculated in the ratings list. It may have something to do with the order in which the ratings are calculated. This is the only thing I can come up with but I still cannot come up with a scenario in which A loses to B and has a higher rating than B when B is the only player A has played. Jim Walker
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.