Author: Stephen A. Boak
Date: 00:06:29 11/17/99
Go up one level in this thread
On November 16, 1999 at 07:32:57, Christophe Theron wrote:
>On November 16, 1999 at 06:49:28, Stephen A. Boak wrote:
>
>>On November 16, 1999 at 02:16:10, Christophe Theron wrote:
>>
>>>On November 15, 1999 at 23:01:17, Stephen A. Boak wrote:
>>>
>>>>Based on the following reported results for Chess Tiger 12.0 at 40/2hr time
>>>>controls, and assumed ratings shown for the opponents, I calculate the
>>>>Performance Rating for Chess Tiger for 122 games at 2726.
>>>>
>>>>SSDF Chesstiger12.0 (A450)-Fritz5.32 (P200MMX), 2575, 30,5-13,5
>>>>SSDF ChessTiger 12 K6-2 - Shredder 2 200MMX, 2503, 28.5-11.5
>>>>ChessTiger12-Fritz6, 2681(?): +5 =1 -0 Thorsten Czub
>>>>SSDF Chesstiger12.0 (equal)-Hiarcs 7.32 128MB K6-2 450 MHz, 2646, 19.5-12.5
>>>>
>>>>--Steve Boak
>>>
>>>What happens to the rating if you take out the games played by Thorsten? Because
>>>there is no evidence that Fritz6 is as strong as Fritz5.32...
>>>
>>>
>>> Christophe
>>
>>Without the Thorsten games, ChessTiger 12.0 is 2711 for 116 games. Yes, I
>>assumed Fritz6 was equal (absent evidence) to Fritz5.32. Dropping those 6 games
>>is not very significant since so many games have elsewhere been reported against
>>opponents with established ratings.
>>
>>--Steve
>
>OK, thanks.
>
>Do you have a program or a spreadsheet to compute this?
>
>
> Christophe
I use a very simple spreadsheet with a very simple formula. Can you read an
Excel file? or another style spreadsheet? Let me know which one you can read,
and I'll send it to you by eMail.
The simple formula (it can be very easily calculated by hand or programmed in
whatever language you want to use) is:
A. Add up all opponent ratings for *all* the games,
then
B. Calculate (Total ChessTiger 12.0 score - Total Opponent score)*400,
then
C. Divide the grand sum (A+B) by the total number of rated games.
It's that easy.
NOTE--for the Step B calculation, you can simply use
(CT12WinQty - CT12LossQty)*400
if it is easier to use the Win and Loss counts for CT12, instead of Total Scores
for CT12 and its Opponents. Here is another way of looking at the same
calculation and how to 'program' it:
[RtgOpp1*QtyGamesVsOpp1 +
RtgOpp2*QtyGamesVsOpp2 +
RtgOpp3*QtyGamesVsOpp3 + ...
RtgOppN*QtyGamesVsOppN +
(CT12TotScore - OppTotScore)*400] / TotRatedGames
I call this the +/- 400 (plus minus 400) rule for Performance Rating
calculation. It is the same as averaging your individual game performance
rating for each game, based on:
A. If you win, you get your opponent's rating plus 400 pts.
B. If you lose, you get your opponent's rating minus 400 pts.
C. If you draw, you get your opponent's rating.
This, by the way, is the basic formula used to establish a provisional rating
for a new USCF player in the United States. After approx 20 games or so, the
provisional rating becomes a 'permanent' rating, the +/- 400 rule is no longer
used, and the USCF then uses a version of ELO rating formulas to alter the
'permanent' rating thereafter.
The +/- 400 rule is used, however, any time it is desired to calculate the
Tournament Performance Rating (TPR) for a player in a particular tournament.
The tournament can be USCF or FIDE type, or any similarly rated, ELO-based
system. If I received a TPR of 2850 in a FIDE tournament, that would mean my
performance level (score obtained versus my particular opponents and their
particular ratings) was about the same as what Kasparov would be expected to
obtain, if he played those same opponents instead of me. :)
It might work also, over a large number of games, on another rating system, such
as the English or British rating system. But the magnitude 400 is probably
scaled for mathematical ELO-systems like USCF and FIDE. You often see the TPR
ratings shown, for example, in the London Chess Centre's This Week in Chess
(TWIC) reports of major tournaments (as a column in the results crosstable). In
this case it is used as a measure of how well a player performed in a single
tournament, against a certain field of opponents.
In this instance, since CT12 opponents are rated at the SSDF ELO-based system,
the Performance Rating I calculated for CT12 may be compared to other comp-comp
ratings issued by SSDF. Thus is approximates the SSDF rating that CT12 has
earned so far due to its score versus those particular SSDF-rated opponents.
I keep my personal human results, including score and opponent rating, on a
spreadsheet. I use the TPR +/- 400 rule to calculate my TPR, tournament by
tournament, as well as my 'running TPR' (which changes game by game) over the
last 50, 25 and 15 games. These TPR figures are easily graphed by my
spreadsheet program (Excel)to track my performance trend over time. I even
separately calculate my TPR with White pieces, then my TPR with Black pieces, so
I can see my trends there, analyze my strengths and weaknesses, and improve my
worst areas. As you would expect, the TPR with White pieces is normally always
higher than the TPR with Black pieces. It is interesting to calculate how much
different those TPR ratings are--if you like statistics like I do! :)
--Steve
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