Talk:Elo rating system

message: The development of the Elo system can be followed here: Digitaal archief Chess Life.
Chess Life, March 5 & April 5, 1960
Chess Life, June 1961. pp. 160-1
A. E. Elo; Analytical Reports, 1961, 1963 & 1965, (Privately Printed)
A. E. Elo; Historical Rating List, Chess Life April 1964
Chess Life, July & August 1967
It would be interesting to uncover the reports from 1961, 1963 and 1965. KP (talk) 12:51, 26 July 2022 (UTC)
thread_title:  Who invented the K-factor? 

message: shouldn't the solid and the dotted black lines be the other way around in figure 2? CwelTHC (talk) 17:11, 1 May 2023 (UTC)
replies: text: or rather the rating change values be flipped around to account for greater changes in unexpected outcomes CwelTHC (talk) 17:14, 1 May 2023 (UTC)

text: by "figure 2" i guess you mean the one with caption beginning "Graphs of probabilities and Elo rating changes…"? —Tamfang (talk) 20:58, 21 May 2023 (UTC)
thread_title:  Figure 2 

message: D        P    |    D       P    |    D        P
Rtg.Dif   H   L  | Rtg Dif  H   L  | Rtg Dif   H   L   
  0-3    .50 .50 | 122-129 .67 .33 | 279-290  .84 .16 
  4-10   .51 .49 | 130-137 .68 .32 | 291-302  .85 .15  
 11-17   .52 .48 | 138-145 .69 .31 | 303-315  .86 .14  
 18-25   .53 .47 | 146-153 .70 .30 | 316-328  .87 .13  
 
 26-32   .54 .46 | 154-162 .71 .29 | 329-344  .88 .12    
 33-39   .55 .45 | 163-170 .72 .28 | 345-357  .89 .11   
 40-46   .56 .44 | 171-179 .73 .27 | 358-374  .90 .10   
 47-53   .57 .43 | 180-188 .74 .26 | 375-391  .91 .09
 
 54-61   .58 .42 | 189-197 .75 .25 | 392-411  .92 .08   
 62-68   .59 .41 | 198-206 .76 .24 | 412-432  .93 .07    
 69-76   .60 .40 | 207-215 .77 .23 | 433-456  .94 .06    
 77-83   .61 .39 | 216-225 .78 .22 | 457-484  .95 .05 
 
 84-91   .62 .38 | 226-235 .79 .21 | 485-517  .96 .04    
 92-98   .63 .37 | 236-245 .80 .20 | 518-559  .97 .03 
 99-106  .64 .36 | 246-256 .81 .19 | 560-619  .98 .02
 107-113 .65 .35 | 257-267 .82 .18 | 620-735  .99 .01
 114-121 .66 .34 | 268-278 .83 .17 | over735 1.00 .00
It is easy to verify the table is actually built with standard deviation 2000/7 as an approximation for 200√2.
A citation to a detailed description of the construction of the table by Elo is desirable.
The construction by pencil and paper is not trivial and prone to errors.
Since the normal curve flattens, one would expect that the number of rating differences within one percentage row does not decrease. However, there is a discontinuity at D = 345-357, P = 89%. This suggests that the table may contain irregularities
Rtg Dif Range                
279 290 11
291 302 11  
303 315 12
316 328 12
329 344 15
345 357 12 <---
358 374 16
375 391 16  
392 411 19
KP (talk) 08:11, 4 August 2023 (UTC)
thread_title:  The development of the Percentage Expectancy Table 

message: While not a universal metric for poker, GGPoker has incorporated an Elo rating system into one of its Sit & Go online poker formats, ‘Spin & Gold ELO’,  where player ratings are determined by win rate. Players are then awarded a letter score based on that rating, with E at the low end of 1200, A at 4000+, Master at 5000+ and Grand Master if they rank within the top 100 players. While the Elo ratings of each player affect how many points are gained or lost, they do not affect match-making.
https://www.pokerlistings.com/rise-up-the-spin-gold-elo-ranking-system-at-ggpoker
https://donkhunter.com/en/news/ggpoker-introduces-spin-gold-elo-ranking-syste,1033.html
https://www.ggpoker.com/poker-games/spin-gold-elo/ Chris H (GGPoker) (talk) 06:08, 12 October 2023 (UTC)
thread_title:  Use Outside of Chess - Other board and card games - Elo in Poker