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  1. #1
    CC FIDE Master
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    Returning players and ratings.

    I have just returned to chess and want to know how do you calculate your rating based on tournament results when you play an unrated player.

    Could Bill Gletsos let all of us know how to calculate our rating with an unrated player.

    lost

  2. #2
    Illuminati Bill Gletsos's Avatar
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    Quote Originally Posted by lost
    I have just returned to chess and want to know how do you calculate your rating based on tournament results when you play an unrated player.

    Could Bill Gletsos let all of us know how to calculate our rating with an unrated player.

    lost
    If the "unrated" opponent is listed as xg on the master file list then the system will use the internal rating it has for the player.
    If the "unrated" opponent is not on the master list or is listed as "unr" or "new" then the rating used will be based on their performance during the entire rating period.

    As such you cannot calculate it.
    The Force can have a strong influence on the weak-minded.
    Mos Eisley spaceport The toolbox. You will never find a more wretched hive of scum and villainy.

  3. #3
    CC FIDE Master
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    Ok thank you Bill.

    lost

  4. #4
    CC International Master
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    To avoid starting another thread: What is the FIDE to ACF conversion? Like if I beat someone who only has a FIDE rating does the change in my rating go completely according to that? Or is there a formula?
    And still, no one has satisfactorily proven, that it isn't opposite day.

  5. #5
    CC Grandmaster Garrett's Avatar
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    Far out how many points did Damien Norris shed from the zonal ?

    his ACF rating is 1620

    Damien was always a great player and from memory always well over 2000.

    I'd hate to be playing him in his next tourney at that rating.

    cheers
    Garrett.

  6. #6
    CC Grandmaster Garvinator's Avatar
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    Quote Originally Posted by Garrett
    Far out how many points did Damien Norris shed from the zonal ?His ACF rating is 1620
    Could have been worse. He could have lost another 21 and been able to play in the Australian Minor

  7. #7
    CC International Master Watto's Avatar
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    Quote Originally Posted by Garrett
    Far out how many points did Damien Norris shed from the zonal ?

    his ACF rating is 1620

    Damien was always a great player and from memory always well over 2000.

    I'd hate to be playing him in his next tourney at that rating.

    cheers
    Garrett.
    He shed 448 points.

  8. #8
    CC Grandmaster Garrett's Avatar
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    okay thanks

    448, that sounds harsh.

    Damien is a great bloke and I think it would be devastating to shed that many points from one tournament (edit - I don't know for fact it was one tournament).
    Last edited by Garrett; 05-10-2009 at 01:12 PM.

  9. #9
    CC Grandmaster Garvinator's Avatar
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    Quote Originally Posted by Garrett
    okay thanks

    448, that sounds harsh.

    Damien is a great bloke and I think it would be devastating to shed that many points from one tournament (edit - I don't know for fact it was one tournament).
    Norris's results from the Oceania Zonal:

    Code:
    Rd. SNo	Name		  Rtg	Res.
    1   60 Stahnke Alexander  1795	s 0
    2   62 Ford Daniel	  1792	w ½
    3   52 Juszczynski Mathew 1914	s 0
    4   56 Rachmadi Herman	  1842	w 0
    5   72 Cigelj David	  1238	s 1
    6   61 Egan Bill	  1795	w 1
    7   49 Jule Alexandra	  1928	s 0
    8   63 Searle Zachary	  1791	s 0
    9   70 Lapitan Daniel	  1287	w 0
    Which means he performed at around 1550 or so for the tournament. Considering that he has played nine games in the tournament, his current rating, while seemingly harsh, is based on his most recent data and 1620 does seem fair for the results he has recorded. There is nothing in these results to indicate that he performed anywhere near his old rating of 2142.

    The better way to look at it is that his past rating is from so long ago that this is a new rating based on his current results. If he plays more and performs way above 1600, then is rating will shoot up just as much.

  10. #10
    CC Grandmaster Garrett's Avatar
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    Quote Originally Posted by Garvinator
    If he plays more and performs way above 1600, then is rating will shoot up just as much.
    Are you sure that is the case ?

    His old rating may (I don't know) have had a question mark or two.

    Now that the rating has no question mark is it possible to gain 442 points if he performed at 2200 for a single 9 round tournament ?

    cheers
    Garrett.

  11. #11
    Monster of the deep Kevin Bonham's Avatar
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    I'm pretty sure the ratings Garvin shows above for Norris's opponents are actually FIDE ratings where the player has a FIDE rating. Try these (noting that they are ACF ratings for the previous period not this one) :

    Code:
    1 Alexander Stahnke                      1635   0.0         
     2 Daniel Ford                           1619   0.5         
     3 Mathew Juszczynski                    1872   0.0         
     4 Herman Rachmadi                       1569   0.0         
     5 David Cigelj                          1238   1.0         
     6 Bill Egan                             1497   1.0       
     7 Alexandra Jule [WIM]                  1826   0.0         
     8 Zachary Searle                        1746   0.0         
     9 Daniel Lapitan                        1287   0.0
    On this basis his TPR was only 1374 though it is a little higher when performances in the period by his opponents are taken into account, as Glicko does.

    Quote Originally Posted by Garrett
    Now that the rating has no question mark is it possible to gain 442 points if he performed at 2200 for a single 9 round tournament ?
    No but a couple of such tournaments in the same ratings period would more or less do it.

    I will shortly move the Norris discussions into the main returning players thread or merge the two threads.

  12. #12
    CC International Master
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    Quote Originally Posted by Kevin Bonham
    I'm pretty sure the ratings Garvin shows above for Norris's opponents are actually FIDE ratings where the player has a FIDE rating. Try these (noting that they are ACF ratings for the previous period not this one) .
    If you want to calculate his true performance rating you need to take ratings for the current period. This is exactly what Glicko does.

  13. #13
    CC Grandmaster Garvinator's Avatar
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    Quote Originally Posted by Kevin Bonham
    On this basis his TPR was only 1374 though it is a little higher when performances in the period by his opponents are taken into account, as Glicko does.
    Well, in this case his performance was even worse that my estimate. Certainly nothing to suggest that his current rating deserves to be anything like 2100.

  14. #14
    Monster of the deep Kevin Bonham's Avatar
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    Quote Originally Posted by drug
    If you want to calculate his true performance rating you need to take ratings for the current period.
    I meant that they are for the period in which the Zonal was played (the ratings that were current at the time the event was processed), rather than being the ratings that are current now.

  15. #15
    CC International Master
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    Quote Originally Posted by Kevin Bonham
    I meant that they are for the period in which the Zonal was played (the ratings that were current at the time the event was processed), rather than being the ratings that are current now.
    When I say current I mean September 2009. When Glicko does calculations it eventually uses ratings that will be the output. We already know what the output is so one can just use it.

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