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table[edit]

Percentage score p into rtg. difference
1.00 +800 +400
0.99 +677 +392
0.9 +366 +320
0.8 +240 +240
0.7 +149 +160
0.6 +72 +80
0.5 0 0
0.4 −72 -80
0.3 −149 -160
0.2 −240 -240
0.1 −366 -320
0.01 −677 -392
0.00 −800 -400

The probability function D800 is given by D800(P) = 4C(P - 0.5), Class interval C = 200. (Elo, 1978, p.146). Rating performance using D800 produces the same result as "algorithm of 400".

quotations[edit]

(Elo, 1978, p. 25)

The coefficent reflects the ralative weights selected for the pre-event rating and the event performance rating. A high K gives high weight to the most recent performance. A low K gives more weight to earlier performances.

The coefficent K reflects the ralative weights selected for the pre-event rating and the event performance rating. A high K gives high weight to the most recent performance. A low K gives more weight to earlier performances (Elo, 1978, p. 25).

The development of the Percentage Expectancy Table (table 2.11) is described in more detail by Elo (1978, p159) as follows:

The normal probabilities may be taken directly from the standard tables of the areas under the normal curve when the difference in rating is expressed as a z score. Since the standard deviation σ of individual performances is defined as 200 points, the standard deviation σ' of the differences in performances becomes √2 or 282.84. the z value of a difference then is D/282.84. This will then divide the area under the curve into two parts, the larger giving P for the higher rated player and the smaller giving P for the lower rated player.

For example, let D = 160. Then z = 160/282.84 = .566. The table gives .7143 and .2857 as the areas of the two portions under the curve. Thes probabilities are rounded to two figures in table 2.11. |author=Arad E. Elo |title=The Rating of Chessplayers

The table is actually build with 2000/7 as an approximation for √2.

Ceci n'est pas une pipe. This is Not a Pipe.

— René Magritte, The Treachery of Images

Foreign language[edit]

Zunächst sind ebenso viele Nummern zu verloosen, als Theilnehmer
vorhanden sein: bei 14 Theilnehmern z. B. die Nummern 1, 2, 3 bis 14.
 Die Paarung geschieht alsdann in folgender Weise: Man fertigt
ein Schema an, welches soviel senkrechte Reihen hat, als die Hälfte
der Theilnehmer beträgt. Bei einer ungeraden Anzähl ist die Anzahl
der senkrechten Reihen die Hälfte der um 1 vergrösserten Theilnemer-
zahl. Bei 14 Theilnehmern sind daher,  14/2 = 7, bei 13 Theilnehmern
(!3+1)/2= 14 / 2, also ebenfalls 7 senkrechte Reihen zu bilden.

Je suis English. Je suis English.

Math[edit]

Base 10 or base [edit]

In The Rating of Chessplayers, 1978, page 141 we read at 8.43:

When the logarithms in equation (38) are taken to the base ,

then the Verhulst and the logistic take the following forms:

(46)

And subsequently in chapter 8.46 Percentage Expectancy Table, page 143 the table does have the header:

Logistic Probabilities to base

Based on the above sources, it is

LSM rating[edit]

Let Gm,m be bipartite with two disjoint parts A, B and m-regular. Let SA, SB be the sum of the scores si of Xi in A, B respectively.

Rating vector q equals: 

   qi = (2.si + T / m) / γ,   where γ = n.m,  T = SA if Xi in A, and SB if Xi in B.

Cite[edit]

Cite direct journal.[1]

Brouwer, Andries E.; Haemers, Willem H. (2012), "12.3.1 Hamming graphs" (PDF), Spectra of graphs, Universitext, New York: Springer, p. 178, doi:10.1007/978-1-4614-1939-6, ISBN 978-1-4614-1938-9, MR 2882891, retrieved 2022-08-08.

Elo, Arpad (1986) [1st pub. 1978]. The Rating of Chessplayers, Past and Present (Second ed.). Arco. ISBN 978-0-668-04721-0.

Jaan Kiusalaas (29 January 2010). "Hoofdstuk 2.7 Iterative Methods, 4.6 Systems of Equations". Numerical Methods in Engineering. With Python (2nd ed.). New York: Cambridge University Press. ISBN 978-0-521-19132-6.

Edmund Landau[2]

[Dr. W. Ahrens][3]

[Citeer Arxiv][4]

Chance[5]

Roblox[6]

In practice, there is little difference between the shape of the logistic and normal curve. So it does not matter whether the logistic or normal distribution is used to calculate the expected scores. [7]

Repeat pp [7]: 3–6 
Repeat pp [7]: Chapter 3 
Repeat at [7]: Chapter 3 
Repeat loc[7]: Chapter 3 

Diversen[edit]

Interwiki: pairwise comparison

(E1)          f(x) = x + 1

Deze iteratie is met pen en papier of pocket calculator uit te voeren. Het resultaat is een benadering. De relatie tussen ratingverschil (D) en winstkans (P) is niet lineair. Het rekenkundige gemiddelde van de tegenstanderratings is een benadering van van de rating waarvan de verwachting van de gespeelde partijen 50% is. Daarom zal deze procedure niet convergeren naar een oplossing, waarin de werkelijke en verwachte waarden identiek zijn.

In de beschouwing wordt uitgegaan van een binomiale verdeling, uitsluitend winst (1) en verlies (0) komen voor. In de schaakpraktijk is remise geen uitzondering. Daardoor wordt de verdeling vlakker. De binomiale variantie van een partij tussen even sterke spelers is per definitie gelijk aan: μ = (0 + 1)/2, en σ2 = (1 - μ)2/2 + (0 - μ)2/2 = 1/4. Inclusief remise (½) wordt dit: μ = (0 + ½ + 1)/3, en σ2 = (1 - μ)2/3 + (½ - μ)2/3 + (0 - μ)2/3 = 1/6. Dit is een factor 2/3 kleiner.[8]

Calculating of the Rating Difference table[edit]

The standard normal distribution, with mean value μ = 0 and standard deviation σ = 1, in x = 2.17 equals to 98.500%. This is the first value in the 99% category. The corresponding rating is 620. Therefore the standard deviation employed in the table equals to 620 / 2.17 = 2000 / 7. The Elo table contains a few irregularities. A more accurate expectation of 620 equals to 98.4997%, which falls into the 98% range. The table assigns 344 to expectation 88%. However the expectation due to the normal distribution is 88.5705%, which is clearly in the 89%. Needed are references to the construction of this table in order to explain the underlying calculation.

If Player A has a rating of and Player B a rating of , the exact formula (using the logistic curve).[9] for the expected score of Player A is

Next[edit]

Elo made references to the papers of Good 1955,[10] David 1959,[11] Trawinski and David 1963[12] and Buhlman and Huber 1963.[13]

The above schedule can also be represented by a graph, as shown below:

Round Robin Schedule Span Diagram

Designing Schedules for Leagues and Tournaments.[14] 

(http://www.emba.uvm.edu/~jdinitz/preprints/design_tourney_talk.pdf)

Brewer's Dictionary of Phrase and Fable

Ramon Llull Ars Magna (cyclic pattterns), Martin Gardner, Last Recreations.

Round robin references [15] [16][17][18]

nl:IJmuiden IJmuiden (nnle)

"Damclub IJmuiden" (in Dutch). Retrieved 2014-01-01.

Édouard Lucas, Récréations Mathématiques, four volumes, Gauthier-Villars, Paris, 1882-94 (https://archive.org/stream/rcrationsmathma01lucagoog#page/n0/mode/2up)

M. Walecki , professeur de Mathémntiques spéciales au lycée Condorcet

http://www.les-mathematiques.net/phorum/read.php?17,569123,569771

Pour Walecki: Walecki Felix Charles Louis

Né le 12/01/1844 à Moselle - Metz. Agrégé de mathématiques. A eu la légion d'honneur. A enseigné au lycée de Nancy avant de sévir à Paris, au lycée Condorcet. » C’est donc son anniversaire aujourd’hui : 166 ans aujourd’hui. Mais il faut aller plus loin : qui est Walecki ? Qu’a-t-il publié ? démontré ? qu’est-ce ce qui pousse à s’intéresser aujourd’hui à lui ? Comment procéder méthodologiquement pour en savoir plus sur lui ?

Schurig does not provide a proof nor a motivation for his algorithm. For more historical details, see Ahrens.[19]

This method was discovered by Felix Walecki and reported by Lucas (1883) as a solution to the Walking schoolgirl problem (Les Promenades du Pensionnat).[20]

Lucas, who describes the method as simple and ingenious, attributes the solution to Felix Walecki. Lucas also shows an alternative solution by means of a sliding puzzle

Other articlea are: [21] [22] [23] and .[24]

Teeds method .[25]

Alternatively Berger tables,[26]

In France this is called the Carousel-Berger system (Système Rutch-Berger).[27] [28]

See also Combinatorial design

Schurig tables.[29]

According to the Oxford Companion, the pairing tables were first published by Richard Schurig in 1886 in Deutsche Schachzeitung v41. "With scant regard for chess history FIDE calls Schurig's creation 'Berger tables' because Johann Berger gave them, duly acknowledged, in his two Schachjahrbucher (1892-3 and 1899-1900) "How old are the Berger round-robin tables?".,

Try to do something in Beta.[22]

A quad is a Round-robin tournament. [30]

Berger published the pairing tables in his two Schachjahrbucher,[31][32] with due reference to its inventor Richard Schurig.[33]

Original construction of pairing tables by Richard Schurig (1886)[edit]

For 7 or 8 players, Schurig[29] builds a table with vertical rows and horizontal rows, as follows:

1. Round 1 2 3 4
2. ,, 5 6 7 1
3. ,, 2 3 4 5
4. ,, 6 7 1 2
5. ,, 3 4 5 6
6. ,, 7 1 2 3
7. ,, 4 5 6 7

Then a second table is constructed as shown below:

1. Round . 1 . 7 . 6 . 5
2. ,, . 5 . 4 . 3 . 2
3. ,, . 2 . 1 . 7 . 6
4. ,, . 6 . 5 . 4 . 3
5. ,, . 3 . 2 . 1 . 7
6. ,, . 7 . 6 . 5 . 4
7. ,, . 4 . 3 . 2 . 1

By merging above tables we arrive at:

1. Round 1, 1 2, 7 3, 6 4, 5
2. ,, 5, 5 6, 4 7, 3 1, 2
3. ,, 2, 2 3, 1 4, 7 5, 6
4. ,, 6, 6 7, 5 1, 4 2, 3
5. ,, 3, 3 4, 2 5, 1 6, 7
6. ,, 7, 7 1, 6 2, 5 3, 4
7. ,, 4, 4 5, 3 6, 2 7, 1

Then the first column is updated. The first or second position are alternating substituted by a bye, if is not even, or by .

The pairing tables were published as an annex concerning the arrangements for the holding of master tournaments.

Relatieve ratings uit de periode Morphy[edit]

Als er toernooiresultaten bekend zijn over een langere periode, dan kunnen de relatieve ratings worden vastgesteld, ook als spelers niet tegen elkaar hebben gespeeld. Elo werkt dit uit, op basis van de onderstaande kruistabel. Cite error: A <ref> tag is missing the closing </ref> (see the help page). voor een moderne benadering van dit probleem.

Irregularities in The Percentage Expectancy Table[edit]

Tables of Normal Probability Functions U. S. Department of Commerce National Bureau of Standards Applied Mathematics Series #23 Issued June 5, 1953

Fide Table Handbook Fide, https://handbook.fide.com/chapter/B022022 The Rating of Chessplayers. [9]

Below we find the irregularities in the table: 

         σ=2000/7
 Rtg H  |z-score |table x           |Tabel y 50% + 2y |Calc             | P
 Dif    |        |                  |                 |                 |
 54  58%| 0,1890 |0,149907183209998 |0,574953591604999|0,574953591604999| 57%
     88%| 1,2000 |0,769860659556583 |0,884930329778292|0,884930329778292|
 343    | 1,2005 |                  |                 |0,885027364557095| 89%
     88%| 1,2010 |0,770248798671795 |0,885124399335897|0,885124399335898|
 344 88%| 1,2040 |0,771410421454696 |0,885705210727348|0,885705210727348| 89% *
        |        |                  |                 |                 |
 358 90%| 1,253  |0,789794293303286 |0,894897146651643|0,894897146651643| 89% *
 392 92%| 1,372  |0,829936562186873 |0,914968281093437|0,914968281093436| 91% *
 620 99%| 2,170  |0,969993154052536 |0,984996577026268|0,984996577026268| 98% *

Inflation in FIDE ratings[edit]

There is no relationship between strength and rating increase. Elo rating is differential. So if FIDE decides to lower the Elo rating of all its members in the pool by 100, the scoring probabilities between players remain the same. As more rating points are added, the average rating per player in the pool will increase.

Rating development chess world champions
Chess Fide Ratings

The graph shows the expectation of the champion's rating from the FIDE rating list, compared to the ratings of the following 19 players. Robert Fischer's superiority is undeniable. The line represents the average rating development. The rating inflation since 1985 is clear.

Magnus Carlsen's rating as of February 2022 is 2865, and the average rating difference with the next 19 players is 102 (64%). Rating inflation have stabilized.

The meaning of the K factor[edit]

The K-factor determines how we weigh past and present. A low K gives more weight to past performances. (Elo, 1978, p. 25). In the following example we show the effect of the K-factor on the rating development in more detail. The K factor in this example is set to 32. 

The new rating (Rn) is approximately equal to the rating performance (Rp) calculated over the games played in the rating period (N = 5) supplemented by (800/K - N) = 20 fictitious draws against own rating.

Let N = 5, Ne = 20, N + Ne = 25, K = 4C / 25, R0 = 1613.

The class interval C = 200 is rooted in tradition (Elo, 1978, p. 19). In this example, the past weighs 4 times as much as the present. If K is set to 10 then the ratio between present and past becomes 1 to 15.

K-factor example: Rn ≈≈ Rp
R0 =1613 Elo Elo 800 Lin A400
Pl Rc N W D P(D) We P(D) We Rp
S0 1613 20 10 0 50,0% 10,00 50,0% 10,00 0
S1 1609 1 ½ 4 50,6% 0,51 50,5% 0,51 0
S2 1477 1 ½ 136 68,3% 0,68 67,0% 0,67 0
S3 1388 1 1 225 78,5% 0,78 78,1% 0,78 400
S4 1586 1 1 27 53,8% 0,54 53,4% 0,53 400
S5 1720 1 0 -107 35,4% 0,35 36,6% 0,37 -400
1601,600 25 13,0 12,865 12,856 400/25
P = 52,00% P = 52,00%
D(P) = 14,330 D800(P) = 16

We note the following:

RnElo   = 1617,33 = 1613 + 32(13,000 – 12,865)
RnP800 = 1617,60 = 1613 + 32(13,000 – 12,856)
RpD800 = 1617,60 = 1601,600 + 16
RpElo  = 1615,93 = 1601,600 + 14,330

As the expectation curve between -300 and +300 is almost linear we have:

RnElo ≈≈ RnD800 == RpD800 ≈≈ RpElo, calculated over the above 25 games.

Percentage Expectancy Curve

P(D) = norm.dist(D, 0, 2000 / 7, cumulative), (Elo, 1978, p.28)

Linear Approximation Formulae ( "algorithm of 400")

P800(D) = D / 4C + 50%, slope = 1 / 4C, intercept = 50%.
D800(P) = (P - 50%)4C.

kolommen[edit]

References[edit]

  1. ^ Csató, L. On the ranking of a Swiss system chess team tournament, Annals of Operations Research 254, 17-36 (2017). https://arxiv.org/abs/1507.05045v5.
  2. ^ Landau, Edmund (1915), "Über Preisverteilung bei Spielturnieren", Zeitschrift für Mathematik und Physik, Leipzig: B. G. Teubner: 192–202
  3. ^ Ahrens, W. (1901), "Zur relativen Bewertung von Turnierpartien", Wiener Schachzeitung, Nr. 10/11 October-Novemb.: 181–192 {{citation}}: |volume= has extra text (help)
  4. ^ Chebotarev, Pavel Yu.; Shamis, Elena (1999). "Preference fusion when the number of alternatives exceeds two: Indirect scoring procedures". Journal of the Franklin Institute. 336 (2): 205–226. arXiv:math/0602171v3. doi:10.1016/S0016-0032(98)00017-9. S2CID 8649169.
  5. ^ Glickman, Mark E., and Jones, Albyn C., "Rating the chess rating system" (1999), Chance, 12, 2, 21-28.
  6. ^ John Shedletsky (2010-02-09), ROBLOX Contests, blog.roblox /2010 /02/ roblox-contests/
  7. ^ a b c d e Glickman, Mark E. (1995), "A Comprehensive Guide to Chess Ratings". A subsequent version of this paper appeared in the American Chess Journal, 3, pp. 59--102.
  8. ^ Balakrishnan, N; Balasubramanian, K.; Viveros, R. (1995). "Some discrete distributions related to extended Pascal Triangles". FibonacciQuart. (33): 415–425.
  9. ^ a b Elo, Arpad E (2008) [1978]. "8.4 Logistic Probability as a Rating Basis". The Rating of Chessplayers, Past&Present. Bronx NY 10453: ISHI Press International. ISBN 978-0-923891-27-5.{{cite book}}: CS1 maint: location (link) Cite error: The named reference "AEE1978" was defined multiple times with different content (see the help page).
  10. ^ Good, I.J. (1955). "On the Marking of Chessplayers". The Mathematical Gazette. 39 (330): 292–296. doi:10.2307/3608567. JSTOR 3608567. S2CID 158885108.
  11. ^ David, H.A. (1959). "Tournaments and Paired Comparisons". Biometrics. 46 (1–2): 139–149. doi:10.1093/biomet/46.1-2.1.
  12. ^ Trawinski, B.J.; David, H.A. (1963). "Selection of the Best Treatment in a Paired-Comparison Experiment". Annals of Mathematical Statistics. 34 (1): 75–91. doi:10.1214/aoms/1177704243.
  13. ^ Buhlmann, Hans; Huber, Peter J. (1963). "Pairwise Comparison and Ranking in Tournaments". The Annals of Mathematical Statistics. 34 (2): 501–510. doi:10.1214/aoms/1177704161.
  14. ^ Dinitz, Jeff (November 13, 2004). "Designing Schedules for Leagues and Tournaments" (PDF). Home Page for Jeff Dinitz. Mount Saint Mary College: GRAPH THEORY DAY 48.
  15. ^ Strehlov, Richard A; Wright, Sue Ellen, eds. (1993). Standardizing Terminology for Better Communication: Practice, Applied Theory and Results. Vol. 1166. ASTM. pp. 336–337. ISBN 0-8031-1493-1.
  16. ^ Brewer's Dictionary of Phrase & Fable. New York: Harper & Brother Publishers. p. 786.
  17. ^ Orcutt, William Dana (1895). Official Lawn Tennis Bulletin. Vol. 2. New York: The Editors. pp. 1, 3.
  18. ^ Illinois. Office of the Superintendent of Public Instruction (1862). "Biennial Report". 44. The Superintendent. LCCN 05034329. ark:/13960/t54f24422. {{cite journal}}: Cite journal requires |journal= (help)
  19. ^ Ahrens, Wilhelm (1901). "Anordnungs Probleme, Aufgabe 2". Mathematische Unterhaltungen und Spiele (in German). Leipzig: B. G. Teubner. ark:/13960/t2w37mv93.
  20. ^ Lucas, Edouard (1883). "Les jeux de demoiselles". Récréations Mathématiques (in French). Paris: Gauthier-Villars. pp. 177–180.
  21. ^ Hasse, Maria (1961). "Über die Behandlung graphentheoretischer Probleme unter Verwendung der Matrizenrechnung". Wissenschaftliche Zeitschrift der Technischen Universität Dresden (in German). 10: 1313–16. ISSN 0043-6925.
  22. ^ a b Ramanujacharyulu, C (1964). "Analyses of preferential experiments". Psychometrika. 29 (3): 257–261. doi:10.1007/BF02289722. S2CID 121033891.
  23. ^ Landau, Edmund (1915). "Über Preisverteilung bei Spielturnieren". Zeitschrift für Mathematik und Physik (in German). 63: 192–202.
  24. ^ Zermelo, E (1915). "Die Berechnung der Turnier Ergebnisse als ein Maximumproblem der Wahrscheinlichkeitsrechnung". Mathematische Zeitschrift (in German). 29: 436–460. doi:10.1007/BF01180541. S2CID 122877703.
  25. ^ Ahrens, Dr. W (1901). "Zur relativen Berwertung von Turnierpartien". Wiener Schachzeitung (in German). IV: 181–191.
  26. ^ Table de Berger (in French), Examples up to 30 participants
  27. ^ Le livre de l'arbitre : édition 2008 (PDF). Fédération Française des Échecs. 2008. p. 56. ISBN 978-2-915853-01-8.
  28. ^ Système Rutch-Berger (PDF). Fédération Française des Échecs. 2008. ISBN 978-2-915853-01-8.
  29. ^ a b Schurig, Richard (1886). "Die Paarung der Theilnehmer eines Turniers". Deutsche Schachzeitung (in German). 41: 134–137. OCLC 556959107.
  30. ^ "An Introduction to USCF-Rated Tournaments" (PDF). The United States Chess Federation. Feb 23, 2006.
  31. ^ Berger, Johann (1893). Schach-Jahrbuch für 1892/93. Leipzig. OCLC 651254787.{{cite book}}: CS1 maint: location missing publisher (link)
  32. ^ Berger, Johann (1899). Schach-Jahrbuch für 1899/1900 : fortsetzung des schach-jahrbuches für 1892/93. Leipzig. pp. 21–27. OCLC 651254792.{{cite book}}: CS1 maint: location missing publisher (link)
  33. ^ Richard Schurig (in French)
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