Difference between revisions of "BoxRec Ratings Description"

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== Introduction ==
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'''Boxing Record Archive''' ([[BoxRec.com]]) provides ''Active'' and ''All'' boxer ratings, as calculated daily by its computer, to entertain its visitors. They have no official value beyond this Web site. The ''All'' ratings include both "Inactive" (retired) and "Active" boxers. The ''Active'' ratings include only those boxers who have had a bout within the past 365 days. (After a year of not fighting, a boxer is automatically designated "inactive" by the BoxRec computer. A boxer is also designated "inactive" if he has announced his retirement, even if he may have had a bout within the past 365 days.) Every boxer in the database is rated--even those with an 0-1 record.
  
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These ratings are not influenced by subjective views or opinions, but are wholly dependent upon the bouts contained in the BoxRec server database. The BoxRec computer re-calculates the ratings daily at approximately 9:35 GMT. As the computer refreshes its calculations each and every day, a boxer may earn or lose ratings points with every bout he has fought since the last calculation--provided, of course, that a BoxRec Editor has entered that bout into the database before the recalculation. A boxer may also earn or lose points if bouts are added to any of his opponents' records, or to their opponents' records--even if the boxer himself has not had a fight since the last BoxRec computer calculation.
  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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There admittedly are inaccuracies and anomalies, especially in the All-Time ratings, because of incomplete records in the BoxRec database. Although a boxer’s own record may be complete, his opponents’ records may not be complete. Pre-World War II boxers in particular are at somewhat of a disadvantage, vis-à-vis modern boxers. Their opponents’ records often are quite incomplete--because of the scarcity of source material or Editors' time--while the records of opponents of more current boxers often are quite complete. So, for example, while the records of Mike Tyson’s opponents may be quite complete--thereby earning Tyson a certain number of points and giving him a high ranking among the All-Time Heavyweights--the records of Young Stribling’s opponents may be extremely lacking, thereby giving Stribling fewer points and a much-lower All-Time rating. And it may appear to the casual BoxRec visitor that Stribling had fought many boxers making their professional debuts or having had only a handful of career bouts, when the truth is that not all of his opponents’ total career bouts have been entered yet into the database by an Editor. (Too many of those old-time bouts are forever lost in history because they were not reported by a newspaper or similar source, or the source was later destroyed.) But as the BoxRec Editors continue to research older resources and enter “new” historical bouts into the database, the rating of an old-time boxer like Stribling will gradually move up or down, even if his own record is complete--if bouts are added to his opponents’ records, or to his opponents' opponents' records, and so forth. So the BoxRec ratings are continually improving as new bouts are entered into the database. (Presently, some 2,000 current and old-time bouts are entered each week by the BoxRec Editors.)
  
<html>
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Further, because of the very few women presently boxing professionally, with some weight divisions having only a handful of active female boxers, a woman with an 0-1 record will appear “world ranked” by BoxRec. This is simply an anomaly due to the few female entries in the database.
  
<head>
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== Ratings structure ==
  
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
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All these ratings evaluate every day all bouts in the database in chronological sequence. A higher rated boxer should be expected to defeat a lower rated boxer with increasing probability by increasing rating difference.
  
<meta name="description" content="Johan Perez - Boxer">
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=== Current ("Active") rating ===
  
<title>Johan Perez - Boxer</title><link rel="stylesheet" type="text/css" href="http://static.boxrec.com/boxrec.css"><script type='text/javascript' src='http://partner.googleadservices.com/gampad/google_service.js'>
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#Every boxer gets a first rating of 0 before his first bout.
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#After every bout, the ratings of the two boxers involved are changed depending on the bout's official result ([[KO]], [[TKO]], [[RTD]], [[unanimous decision|UD]], [[points|PTS]], [[newspaper decision|NWS]], [[majority decision|MD]], [[split decision|SD]], [[disqualification|DQ]], [[technical decision|TD]], [[draw|DRAW]]).
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#The value of a result varies between v=1 and v=0.
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#The clear decision factor varies between cd=1 and cd=0.
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#The winner cannot lose points for KO, TKO, RTD, DQ, TD and decisions on points with cd=1
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#KO, TKO, RTD are rewarded with full value v=1, cd=1.
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#NWS is rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed. Clear decision factor cd=1.
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#UD, PTS are rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed, clear decision factor cd=1. This is valid, if the score cards are not available.
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#DRAW is rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed. Clear decision factor cd=0.
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#MD, SD, DQ, TD are rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed. Clear decision factor cd=0.5. This is valid, if the score cards are not available.
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#If the score cards are available, the value rewarded is in direct proportion to the rounds boxed, with full value v=1 for 12 rounds boxed and more. The clear decision factor is in proportion to rounds boxed and the mean score difference per judge. cd=1 for a mean score difference per judge of 50% of the rounds boxed.
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#All bouts are regarded to have the same weight independent of titles.
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#The winner gets a certain part of the opponent's points and a certain part of the rating difference to the opponent's rating.
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#For a DRAW the rating of the higher rated boxer is reduced by some part of the point difference; the rating of the lower rated boxer is enhanced by the same amount of points.
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# The full relative point reward is 33%. It is in direct proportion to the pre-bout rating of the defeated opponent.
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#The winner can get up to 25 additional points per opponent's launch state rank
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#The maximum launch state rank regarded is 15 - and so the maximum number of additional points is 375
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#This value is reduced by the own rating, and it is set in direct proportion to the rounds boxed and the clearness of the decision
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#This value is multipied by the maximum of 6 * the opponent's launch state+1 and the minimum of the opponent's rating and 25 * the opponent's launch state
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#This value is divided by 25 * the opponent's launch state
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#This value is multiplied by the quotient of the maximum of the opponent rating and 18 on one side and the sum of the maxima of the opponent rating and 18 and the maxima of the own rating and 18
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#Launch states are:  
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##0 = no recent win
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##1 = 1 recent win, 2 = 2 recent wins, 3 = 3 recent wins
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##4 = recent win over opponent with state 3, 5 = 2 recent wins over opponent with state 3, 6 = 3 recent wins over opponent with state 3
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##7 = recent win over opponent with state 6, 8 = 2 recent wins over opponent with state 6, 9 = 3 recent wins over opponent with state 6
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##10 = recent win over opponent with state 9, 11 = 2 recent wins over opponent with state 9, 12 = 3 recent wins over opponent with state 9
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##13 = recent win over opponent with state 12, 14 = 2 recent wins over opponent with state 12, 15 = 3 recent wins over opponent with state 12
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#The ratings are decreased for moving up to higher weight divisions by the square of the reciprocal ratio of the weights limits of the divisions--and they are increased by the same factor for moving down the divisions.  
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#The rating of a boxer is reduced by 0% to 50%, if he didn't box an opponent with a rating of at least 50% to 0% of his own rating points within 18 months.  
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#The rating of a boxer is reduced by 50% for every time period of inactivity of 18 months.
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#The pre-bout rating of a boxer successfully returning from inactivity is set to the lower value of his own rating before inactivity and the higher value of his own rating after inactivity and the pre-bout rating of his opponent.
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#The pre-bout rating of a successfully debuting boxer is set to 25% of his opponents pre-bout rating.
  
</script>
 
  
<script type='text/javascript'>
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'''Formula'''
  
GS_googleAddAdSenseService("ca-pub-7857969694503313");
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If a boxer with a rating of r_a before the fight defeats a boxer b with a rating of r_b before the fight with result of value v and clear decision factor cd, the new ratings r_a_new and r_b_new after a fight are, earn_f is 33.3%:
  
GS_googleEnableAllServices();
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*earn = earn_f * v * (r_b*cd + (r_b-r_a)/(1+2*cd));
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*r_a_new = r_a + earn
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*r_b_new = r_b - earn
  
</script>
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Additional points (no additional loss points accounted):
  
<script type='text/javascript'>
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*opponent in launch state n: v * cd * (25*n - r_a) * max(6*(n+1),min(r_b,25*n)) / (25*n) * max(r_a,18) / (max(r_a,18) + max(r_b,18))
  
GA_googleAddSlot("ca-pub-7857969694503313", "BoxRec_300x250");
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Rating reduction caused by missing opponent quality:
  
GA_googleAddSlot("ca-pub-7857969694503313", "BoxRec_Sky_1");
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*r_new = r_old * (1 - 0.5*(1 - best_opp/r_old/0.5))
  
GA_googleAddSlot("ca-pub-7857969694503313", "BoxRec_Header");
 
  
GA_googleAddSlot("ca-pub-7857969694503313", "BoxRec_Top");
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'''Examples'''
  
GA_googleAddSlot("ca-pub-7857969694503313", "BoxRec_MPU_left_1");
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''Boxer a KO boxer b, a has 1000 points, b has 500 points. launch state 4, v=1, cd=1, ''
  
GA_googleAddSlot("ca-pub-7857969694503313", "BoxRec_MPU_left_2");
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*earn= 0.33 * 1 * (500*1 + (500-1000)/(1+2*1)) = 111
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*r_a_new = 1000 + 111 = 1111
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*r_b_new =  500 - 111 =  389
  
GA_googleAddSlot("ca-pub-7857969694503313", "BoxRec_MPU_left_3");
 
  
GA_googleAddSlot("ca-pub-7857969694503313", "BoxRec_MPU_left_4");
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''Boxer a UD 6 boxer b, scores 59:55 58:56 58:56, a has 1000 points, b has 500 points.''
  
GA_googleAddSlot("ca-pub-7857969694503313", "BoxRec_Footer");
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*A 6 rounder is rewarded with value 6/12, v=0.5
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*UD is rewarded with cd=1 at maximum
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*mean score difference per judge is (4+2+2)/3 = 2.667, which is rewarded in direct proportion to half the rounds boxed with cd= 2.667/3 = 0.89 at maximum
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*so cd=0.89
  
GA_googleAddSlot("ca-pub-7857969694503313", "BoxRec_Front_Page_MPU");
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*earn= 0.33 * 0.5 * (500*0.89 + (500-1000)/(1+2*0.89)) = 44
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*r_a_new = 1000 + 44 = 1044
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*r_b_new =  500 - 44 =  456
  
</script>
 
  
<script type='text/javascript'>
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''Boxer a SD 4 boxer b, scores 39:37 39:37 37:39, a has 1000 points, b has 500 points''
  
GA_googleFetchAds();
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*A 4 rounder is rewarded with 4/12, v=0.333
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*SD is rewarded with cd=0.5 at maximum
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*mean score difference per judge is (2+2-2)/3 = 0.667, which is rewarded in direct proportion to half the rounds boxed 0.667/2 at maximum\
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*so cd=0.333
  
</script>
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*earn= 0.33 * 0.33 * (500*0.33 + (500-1000)/(1+2*0.33)) = -15
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*r_a_new = 1000 - 15 = 985
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*r_b_new =  500 + 15 = 515
  
  
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''More complex - Boxer a KO 4 boxer b, a has 30 points, b has 40 points, boxer b is in launch state 3, v=1, cd=1''
  
</head>
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*earn= 0.33 * 1 * (40*1 + (40-30)/(1+2*1)) = 14
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*r_a_new = 30 + 14 = 44
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*r_b_new = 40 - 19 = 21
  
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*additional points:
  
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*1 * 1 * (3*25 - 30) * max(6*4,min(40,3*25)) / 75 * 30 / (30+40)= 1 * 45 * 40 / 75 * 3 / 7 = 10
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*r_a_new = 44 + 10 = 54
  
<body>
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=== All Time ("Inactive") Ratings ===
  
<a name="top"></a>
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The All Time Rating for a boxer is the sum of 33% of the sum of annual rank points he gets for his annual ratings - and 33% of the sum of annual rank points of best defeated opponents - and 14% of his career top rating:
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#the annual rating is the rating at the end of every year the boxer was active
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#annual rank points = 200 / annual rank in division cluster
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#the value of 200 annual points for the top boxer is reduced, if the annual rating of #10 in the division cluster is less than 100 for men, -  and if the annual rating of #5 in the division cluster is less than 50 for women
  
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=== Bout Star Ratings ===
  
<table width="100%" class="a">
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All bouts are rated with 0 to 5 stars.
  
<tr valign=top>
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Men
  
<td width="20%" class="a">
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* 5 stars = both opponents have 331 ratings points at least ~ best 100 boxers
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* 4 stars = both opponents have 188 ratings points at least ~ best 300 boxers
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* 3 stars = both opponents have 83 ratings points at least ~ best 900 boxers
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* 2 stars = both opponents have 24 ratings points at least ~ best 2700 boxers
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* 1 stars = both opponents have 1 rating point at least = rated boxers
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* 0 stars = one opponents has not even 1 rating point at least = not rated boxers
  
<a href="http://boxrec.com/index.php"><img src="http://static.boxrec.com/BoxRec.png" border="0" alt="BoxRec"></a></td>
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Women
  
<td class="a" align="center" width="60%"><center>
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* 5 stars = both opponents have 42 ratings points at least ~ best 30 boxers
<script type='text/javascript'>
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* 4 stars = both opponents have 28 ratings points at least ~ best 60 boxers
GA_googleFillSlot("BoxRec_Header");
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* 3 stars = both opponents have 14 ratings points at least ~ best 120 boxers
</script>
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* 2 stars = both opponents have 4 ratings points at least ~ best 240 boxers
</center>
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* 1 stars = both opponents have 1 rating point at least = rated boxers
<p>
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* 0 stars = one opponents has not even 1 rating point at least = not rated boxers
</td>
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<td class="a" align="right">
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== Links ==
 
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*[http://boxrec.com/forum/viewtopic.php?f=3&t=28051 BoxRec Forum] discussion of Ratings Formula
<form name=language method="post" action="/list_bouts.php" target="_parent">
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*[http://www.boxrec.com/ratings.php BoxRec's Ratings]: Current & All-Time
 
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*[[BoxRec.com|BoxRec History & Description]]
<select name="set_language" dir="ltr" onchange="this.form.submit();" style="vertical-align: top"><option value="da-utf-8">Danish</option>
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*[[BoxRec's Annual Ratings|BoxRec's Annual Ratings Men]], [[BoxRec's Annual Ratings Women|BoxRec's Annual Ratings Women]]
<option value="de-utf-8">Deutsch</option>
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*[http://www.boxrec.com/ BoxRec Home Page]
<option value="nl-utf-8">Dutch</option>
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<option value="en-utf-8">English</option>
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<option value="es-utf-8" selected="selected">Español</option>
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<option value="pl-utf-8">Polski</option>
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<option value="ru-utf-8">Русский</option>
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<option value="zh-utf-8">汉语</option>
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</select></form></td></tr></table>
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<a href="forum/ucp.php?mode=login">login</a></td></tr></table><br clear=all><center>
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<script type='text/javascript'>
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GA_googleFillSlot("BoxRec_Top");
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</script>
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</center>
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<p>
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<div id="bioBody">
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<div id="bioContent">
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<table align=center class=border>
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<tr><th colspan="2" class="title">Johan Perez</th><tr><tr><td>identificación global<td><b>294852</b></td></tr><tr><td>sexo</td><td>masculino</td></tr><tr><td>fecha de nacimiento</td><td>1983-06-10 / edad 29</td></tr><tr><td>apoderado/agent</td><td><a href="register.php?boxer_id=294852" rel="nofollow">register</a></td></tr><tr><td>división</td><td>peso superligero</td></tr><tr><td>rating</td><td><div class="flag world" title="Mundo">&nbsp;</div><a href=ratings.php?sex=M&division=Light+Welterweight&pageID=2>43 / 1557</a><br><div class="flag ve" title="Venezuela">&nbsp;</div><a href=ratings.php?sex=M&division=Light+Welterweight&country=VE&pageID=1>1 / 6</a></td></tr><tr><td>guardia</td><td>diestro</td></tr><tr><td>altura</td><td>5&prime; 11&Prime; &nbsp; / &nbsp; 180cm</td></tr><tr><td>apodo</td><td>El Terrible</td></tr><tr><td> nacionalidad </td><td> Venezuela </td></tr><tr><td>ciudad de residencia</td><td>Caracas, Venezuela</td></tr><tr><td>lugar de nacimiento</td><td>Caracas, Venezuela</td></tr><tr><td>nombre de nacimiento</td><td>Johan Alfredo Perez Morales</td></tr><tr><td colspan=2>
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            <center>
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            <font color=#008000>victorias <b>15</b> (KO 12)</font>
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            +
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            <font color=red>derrotas <b>1</b> (KO 0)</font>
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            +
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            <font color=#2B60DE>empató <b>1</b></font>
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            =
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            <b>18</b><br>
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            rounds boxed <b>65</b> KO% <b>66,67</b>
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            </center>
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            </td></tr><tr><td colspan=2 align=center><table><tr><td class=a><div class="icon book-open">&nbsp;</div><a href="media/index.php?title=Human:294852">biography</a></td><td class=a><td class=a><a href="watching.php?action=add&human_id=294852">
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<img src=http://static.boxrec.com/watch.png border=0 alt="watch">watch</a></td>
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<td class=a></td></tr></table></td></tr></table></div>
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<div id="bioAds"><center>
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<script type='text/javascript'>
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GA_googleFillSlot("BoxRec_300x250");
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</script>
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</center>
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</div>
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</div>
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<div id="clear"></div>
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<p>
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<form method=POST ACTION="/list_bouts.php?human_id=294852&cat=boxer">
+
 
+
<table class="border" align="center">
+
 
+
<tr valign=middle><th valign=middle>
+
 
+
&nbsp;Lb<input type="radio" name="set_weight" value="Lb" onClick="submit()">&nbsp;St<input type="radio" name="set_weight" value="St:Lb" onClick="submit()">&nbsp;Kg<input type="radio" name="set_weight" value="Kg" onClick="submit()" checked > &nbsp; | &nbsp;
+
 
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<input type="radio" name="set_order" value="Ascending" onClick="submit()" checked>
+
 
+
<b>&uarr;</b>fecha<b>&darr;</b>
+
 
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<input type="radio" name="set_order" value="Descending" onClick="submit()"> &nbsp; | &nbsp; ratings off
+
 
+
            <input type="radio" name="set_bout_ratings" value="Off" onClick="submit()">
+
 
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            on
+
 
+
            <input type="radio" name="set_bout_ratings" value="On" onClick="submit()" checked></th><th valign=middle><div class="icon chart">&nbsp;</div>
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+
            <input type="radio" name="set_bout_ratings" value="Graphics" onClick="submit()">
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            </th><th valign=middle> | &nbsp; </th><th valign=middle><div class="icon print">&nbsp;</div> <a href="prt.php?human_id=294852&cat=boxer" target=_BLANK>print</a></b></th></tr></table></form><p><table align=center><tr><th class=left></th><th></th><th>fecha</th><th>Kg</th><th>oponente</th><th>Kg</th><th>G-P-E</th><th>últimos 6</th><th align=left>lugar</th><th></th><th></th><th></th><th></th><th>división</th><th align=center>box pre</th><th align=center>box aft</th><th align=center>opp pre</th><th align=center>opp aft</th><th></th><th class=right></th></tr><tr><td class=left></td><td><div class="icon tick"></div></td><td><a href='date_search.php?yyyy=2012&mm=07&dd=21'>2012-07-21</a></td><td>63.4</td><td><a href="list_bouts.php?human_id=352193&cat=boxer">Pablo Cesar Cano</a></td><td>63.5</td><td class="c"><font color=#008000><b>24</b></font>-<font color=red><b>1</b></font>-<font color=#2B60DE><b>1</b></font></td><td align=right><table><tr><td class=w></td><td class=w></td><td class=w></td><td class=l></td><td class=w></td><td class=w></td></Tr></table></td><td>Oasis Hotel Complex, Cancun, Quintana Roo, México</td><td class=rl>P</td><td>DT</td><td align=right>7</td><td align=right>12</td><td>peso superligero</td><td align=center>164</td><td align=center>143</td><td align=center>138</td><td align=center>170</td><td><a href="/media/index.php?title=Fight:1700393"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> árbitro: <a href="list_bouts.php?human_id=401173&cat=referee">Luis Pabon</a>  | juez: <a href="list_bouts.php?human_id=402849&cat=judge">Guillermo Perez Pineda</a> 67-67 | juez: <a href="list_bouts.php?human_id=402316&cat=judge">Cesar Ramos</a> 65-68 | juez: <a href="list_bouts.php?human_id=400927&cat=judge">Hubert Earle</a> 65-68 </small><br><a href="title_search.php?title=WBA&division=Light Welterweight&SUBMIT=Go">interim WBA World peso superligero título</a></br><small>Accidental head clash</small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon query"></div></td><td><a href='date_search.php?yyyy=2011&mm=12&dd=10'>2011-12-10</a></td><td>63.5</td><td><a href="list_bouts.php?human_id=388971&cat=boxer">Fernando Castaneda</a></td><td>63.5</td><td class="c"><font color=#008000><b>18</b></font>-<font color=red><b>5</b></font>-<font color=#2B60DE><b>0</b></font></td><td align=right><table><tr><td class=w></td><td class=w></td><td class=w></td><td class=w></td><td class=w></td><td class=w></td></Tr></table></td><td>El Palenque de la Feria, Tepic, Nayarit, México</td><td class=rw>G</td><td>KOT</td><td align=right>4</td><td align=right>12</td><td>peso superligero</td><td align=center>148</td><td align=center>164</td><td align=center>58</td><td align=center>49</td><td><a href="/media/index.php?title=Fight:1637660"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> árbitro: <a href="list_bouts.php?human_id=401173&cat=referee">Luis Pabon</a>  | juez: <a href="list_bouts.php?human_id=424039&cat=judge">Jason Garcia</a>  | juez: <a href="list_bouts.php?human_id=403816&cat=judge">Enrique Portocarrero</a>  | juez: <a href="list_bouts.php?human_id=402537&cat=judge">Jose Roberto Torres</a>  </small><br><a href="title_search.php?title=WBA&division=Light Welterweight&SUBMIT=Go">interim WBA World peso superligero título</a> <small>(supervisor: <a href="list_bouts.php?human_id=527959&cat=supervisor">Francisco Pina</a>)</small></br></td><td class=right></tr><tr><td class=left></td><td><div class="icon tick"></div></td><td><a href='date_search.php?yyyy=2011&mm=10&dd=22'>2011-10-22</a></td><td>63.5</td><td><a href="list_bouts.php?human_id=395184&cat=boxer">Kenny Galarza</a></td><td>63.5</td><td class="c"><font color=#008000><b>15</b></font>-<font color=red><b>1</b></font>-<font color=#2B60DE><b>0</b></font></td><td align=right><table><tr><td class=w></td><td class=w></td><td class=w></td><td class=l></td><td class=w></td><td class=w></td></Tr></table></td><td>Arena Roberto Duran, Panama City, Panamá</td><td class=rw>G</td><td>KOT</td><td align=right>4</td><td align=right>9</td><td>peso superligero</td><td align=center>78</td><td align=center>148</td><td align=center>106</td><td align=center>67</td><td><a href="/media/index.php?title=Fight:1625692"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> tiempo: 2:48 | árbitro: <a href="list_bouts.php?human_id=400865&cat=referee">Uriel Aguilera</a>  | juez: <a href="list_bouts.php?human_id=402849&cat=judge">Guillermo Perez Pineda</a>  | juez: <a href="list_bouts.php?human_id=437396&cat=judge">Sergio Caiz</a>  | juez: <a href="list_bouts.php?human_id=401630&cat=judge">Levi Martinez</a>  </small><br><a href="title_search.php?title=WBALAT&division=Light Welterweight&SUBMIT=Go">vacante WBA Fedelatin peso superligero título</a></br></td><td class=right></tr><tr><td class=left></td><td><div class="icon tick"></div></td><td><a href='date_search.php?yyyy=2011&mm=06&dd=17'>2011-06-17</a></td><td>63.5</td><td><a href="list_bouts.php?human_id=323278&cat=boxer">Alberto Mosquera</a></td><td>63.5</td><td class="c"><font color=#008000><b>16</b></font>-<font color=red><b>0</b></font>-<font color=#2B60DE><b>0</b></font></td><td align=right><table><tr><td class=w></td><td class=w></td><td class=w></td><td class=w></td><td class=w></td><td class=w></td></Tr></table></td><td>Arena Roberto Duran, Panama City, Panamá</td><td class=rd>E</td><td>DM</td><td align=right>10</td><td align=right>10</td><td>peso superligero</td><td align=center>64</td><td align=center>78</td><td align=center>112</td><td align=center>99</td><td><a href="/media/index.php?title=Fight:1591503"><div class="icon book-open"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> árbitro: <a href="list_bouts.php?human_id=401395&cat=referee">Omar Quijada</a>  | juez: <a href="list_bouts.php?human_id=401345&cat=judge">Eliecer Perez</a> 95-95 | juez: <a href="list_bouts.php?human_id=401396&cat=judge">Bolivar Arauz</a> 94-97 | juez: <a href="list_bouts.php?human_id=401346&cat=judge">Arturo Sánchez</a> 96-96 </small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon tick"></div></td><td><a href='date_search.php?yyyy=2011&mm=04&dd=15'>2011-04-15</a></td><td>65.3</td><td><a href="list_bouts.php?human_id=51511&cat=boxer">Noel Gomez</a></td><td>65.3</td><td class="c"><font color=#008000><b>18</b></font>-<font color=red><b>29</b></font>-<font color=#2B60DE><b>3</b></font></td><td align=right><table><tr><td class=l></td><td class=l></td><td class=l></td><td class=l></td><td class=l></td><td class=l></td></Tr></table></td><td>Palacio Dorado, Panama City, Panamá</td><td class=rw>G</td><td>KO</td><td align=right>2</td><td align=right>8</td><td>peso welter</td><td align=center>58</td><td align=center>58</td><td align=center>4</td><td align=center>4</td><td><a href="/media/index.php?title=Fight:1588154"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> tiempo: 2:29 | árbitro: <a href="list_bouts.php?human_id=401393&cat=referee">Hector Afu</a>  | juez: <a href="list_bouts.php?human_id=426656&cat=judge">Victor Simmons</a>  | juez: <a href="list_bouts.php?human_id=451628&cat=judge">Fernando Murray</a>  | juez: <a href="list_bouts.php?human_id=401999&cat=judge">Ignacio Robles</a>  </small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon query"></div></td><td><a href='date_search.php?yyyy=2011&mm=03&dd=04'>2011-03-04</a></td><td></td><td><a href="list_bouts.php?human_id=243777&cat=boxer">Yader Polanco</a></td><td></td><td class="c"><font color=#008000><b>11</b></font>-<font color=red><b>10</b></font>-<font color=#2B60DE><b>0</b></font></td><td align=right><table><tr><td class=nc></td><td class=l></td><td class=l></td><td class=l></td><td class=l></td><td class=l></td></Tr></table></td><td>Casino Pharaohs, Managua, Nicaragua</td><td class=rw>G</td><td>KOT</td><td align=right>1</td><td align=right>6</td><td>peso superligero</td><td align=center>64</td><td align=center>64</td><td align=center>0</td><td align=center>0</td><td><a href="/media/index.php?title=Fight:1578286"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> tiempo: 0:44 | árbitro: <a href="list_bouts.php?human_id=406631&cat=referee">Onofre Ramirez</a>  | juez: <a href="list_bouts.php?human_id=409806&cat=judge">Augusto Rojas</a>  | juez: <a href="list_bouts.php?human_id=410741&cat=judge">Armando Garcia</a>  | juez: <a href="list_bouts.php?human_id=410740&cat=judge">Manuel Gonzalez Martinez</a>  </small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon query"></div></td><td><a href='date_search.php?yyyy=2010&mm=12&dd=10'>2010-12-10</a></td><td>66.7</td><td><a href="list_bouts.php?human_id=15770&cat=boxer">Gilbert Quiros</a></td><td></td><td class="c"><font color=#008000><b>19</b></font>-<font color=red><b>13</b></font>-<font color=#2B60DE><b>1</b></font></td><td align=right><table><tr><td class=l></td><td class=l></td><td class=d></td><td class=w></td><td class=w></td><td class=l></td></Tr></table></td><td>Fight Club Escazu, San Jose, Costa Rica</td><td class=rw>G</td><td>KO</td><td align=right>1</td><td align=right>8</td><td>peso welter</td><td align=center>31</td><td align=center>58</td><td align=center>30</td><td align=center>20</td><td><a href="/media/index.php?title=Fight:1559721"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> tiempo: 2:37 | árbitro: <a href="list_bouts.php?human_id=402670&cat=referee">Victor Molina</a>  | juez: <a href="list_bouts.php?human_id=401660&cat=judge">Ruben Garcia Dr.</a>  | juez: <a href="list_bouts.php?human_id=401157&cat=judge">Julio C. Alvarado</a>  | juez: <a href="list_bouts.php?human_id=404820&cat=judge">Dimas Fonseca</a>  </small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon query"></div></td><td><a href='date_search.php?yyyy=2010&mm=11&dd=13'>2010-11-13</a></td><td></td><td><a href="list_bouts.php?human_id=396104&cat=boxer">Johnny Greaves</a></td><td></td><td class="c"><font color=#008000><b>3</b></font>-<font color=red><b>56</b></font>-<font color=#2B60DE><b>0</b></font></td><td align=right><table><tr><td class=l></td><td class=l></td><td class=l></td><td class=w></td><td class=l></td><td class=l></td></Tr></table></td><td>M.E.N. Arena, Manchester, Lancashire, Reino Unido</td><td class=rw>G</td><td>PTS</td><td align=right>4</td><td align=right>4x3</td><td>peso superligero</td><td align=center>35</td><td align=center>35</td><td align=center>0</td><td align=center>0</td><td><a href="/media/index.php?title=Fight:1554009"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> árbitro: <a href="list_bouts.php?human_id=404431&cat=referee">Steve Gray</a> 40-36 </small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon tick"></div></td><td><a href='date_search.php?yyyy=2010&mm=07&dd=31'>2010-07-31</a></td><td>62.8</td><td><a href="list_bouts.php?human_id=35834&cat=boxer">Jose Miranda</a></td><td>63.5</td><td class="c"><font color=#008000><b>9</b></font>-<font color=red><b>9</b></font>-<font color=#2B60DE><b>3</b></font></td><td align=right><table><tr><td class=d></td><td class=l></td><td class=l></td><td class=w></td><td class=l></td><td class=l></td></Tr></table></td><td>Arena Panama Al Brown, Colon City, Panamá</td><td class=rw>G</td><td>DU</td><td align=right>8</td><td align=right>8</td><td>peso superligero</td><td align=center>32</td><td align=center>35</td><td align=center>17</td><td align=center>17</td><td><a href="/media/index.php?title=Fight:1527675"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> árbitro: <a href="list_bouts.php?human_id=403304&cat=referee">Hector Montes</a>  | juez: <a href="list_bouts.php?human_id=535725&cat=judge">Jesus Aleman</a> 77-75 | juez: <a href="list_bouts.php?human_id=401474&cat=judge">Saturio Segarra</a> 78-75 | juez: <a href="list_bouts.php?human_id=403343&cat=judge">Luis Blandón</a> 77-76 </small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon query"></div></td><td><a href='date_search.php?yyyy=2010&mm=03&dd=27'>2010-03-27</a></td><td>63.5</td><td><a href="list_bouts.php?human_id=348038&cat=boxer">Azael Cosio</a></td><td>63.5</td><td class="c"><font color=#008000><b>8</b></font>-<font color=red><b>0</b></font>-<font color=#2B60DE><b>2</b></font></td><td align=right><table><tr><td class=d></td><td class=w></td><td class=d></td><td class=w></td><td class=w></td><td class=nc></td></Tr></table></td><td>Polideportivo José María Vargas, La Guaira, Venezuela</td><td class=rw>G</td><td>KOT</td><td align=right>2</td><td align=right>9</td><td>peso superligero</td><td align=center>23</td><td align=center>32</td><td align=center>4</td><td align=center>4</td><td><a href="/media/index.php?title=Fight:1496650"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> árbitro: <a href="list_bouts.php?human_id=403941&cat=referee">Domingo Salcedo</a>  | juez: <a href="list_bouts.php?human_id=403939&cat=judge">Miguel Hurtado</a>  | juez: <a href="list_bouts.php?human_id=404883&cat=judge">Franklin Mejias</a>  | juez: <a href="list_bouts.php?human_id=403945&cat=judge">Benito Parra</a>  </small><br><a href="title_search.php?title=FEDCEN&division=Light Welterweight&SUBMIT=Go">vacante WBA Fedecentro peso superligero título</a></br></td><td class=right></tr><tr><td class=left></td><td><div class="icon tick"></div></td><td><a href='date_search.php?yyyy=2009&mm=11&dd=27'>2009-11-27</a></td><td>63.3</td><td><a href="list_bouts.php?human_id=348038&cat=boxer">Azael Cosio</a></td><td>63.3</td><td class="c"><font color=#008000><b>8</b></font>-<font color=red><b>0</b></font>-<font color=#2B60DE><b>2</b></font></td><td align=right><table><tr><td class=w></td><td class=d></td><td class=w></td><td class=d></td><td class=w></td><td class=w></td></Tr></table></td><td>Arena Roberto Duran, Panama City, Panamá</td><td class=rnc>SD</td><td>SD</td><td align=right>3</td><td align=right>9</td><td>peso superligero</td><td align=center>23</td><td align=center>23</td><td align=center>4</td><td align=center>4</td><td><a href="/media/index.php?title=Fight:1460399"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> árbitro: <a href="list_bouts.php?human_id=401395&cat=referee">Omar Quijada</a>  | juez: <a href="list_bouts.php?human_id=401346&cat=judge">Arturo Sánchez</a>  | juez: <a href="list_bouts.php?human_id=406752&cat=judge">David Singh</a>  | juez: <a href="list_bouts.php?human_id=485165&cat=judge">Aida Tejada</a>  </small><br><a href="title_search.php?title=WBABOL&division=Light Welterweight&SUBMIT=Go">WBA Fedebol peso superligero título</a></br><small>Accidental headbutt</small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon tick"></div></td><td><a href='date_search.php?yyyy=2009&mm=08&dd=08'>2009-08-08</a></td><td>62.4</td><td><a href="list_bouts.php?human_id=443578&cat=boxer">Yonel Echenique</a></td><td>62.6</td><td class="c"><font color=#008000><b>1</b></font>-<font color=red><b>2</b></font>-<font color=#2B60DE><b>0</b></font></td><td align=right><table><tr><td class=w></td><td class=l></td><td class=l></td></Tr></table></td><td>Gimnasio Yuyin Luzcando, Panama City, Panamá</td><td class=rw>G</td><td>KOT</td><td align=right>3</td><td align=right>6</td><td>peso superligero</td><td align=center>23</td><td align=center>23</td><td align=center>0</td><td align=center>0</td><td><a href="/media/index.php?title=Fight:1439642"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> tiempo: 1:02 | árbitro: <a href="list_bouts.php?human_id=505718&cat=referee">Hadilton Jimenez</a>  | juez: <a href="list_bouts.php?human_id=409273&cat=judge">Roberto Perlaza Quintana</a>  | juez: <a href="list_bouts.php?human_id=451628&cat=judge">Fernando Murray</a>  | juez: <a href="list_bouts.php?human_id=401345&cat=judge">Eliecer Perez</a>  </small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon query"></div></td><td><a href='date_search.php?yyyy=2009&mm=02&dd=08'>2009-02-08</a></td><td>63.5</td><td><a href="list_bouts.php?human_id=198812&cat=boxer">Dunis Linan</a></td><td>62.6</td><td class="c"><font color=#008000><b>10</b></font>-<font color=red><b>12</b></font>-<font color=#2B60DE><b>2</b></font></td><td align=right><table><tr><td class=l></td><td class=l></td><td class=w></td><td class=l></td><td class=w></td><td class=d></td></Tr></table></td><td>Plaza Caracas El Silencio, Caracas, Venezuela</td><td class=rw>G</td><td>DU</td><td align=right>8</td><td align=right>8</td><td>peso superligero</td><td align=center>4</td><td align=center>23</td><td align=center>20</td><td align=center>15</td><td><a href="/media/index.php?title=Fight:1386680"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td><div class="icon query"></div></td><td><a href='date_search.php?yyyy=2007&mm=06&dd=16'>2007-06-16</a></td><td>63.5</td><td><a href="list_bouts.php?human_id=37135&cat=boxer">Franklin Arroyo</a></td><td>63.5</td><td class="c"><font color=#008000><b>6</b></font>-<font color=red><b>4</b></font>-<font color=#2B60DE><b>0</b></font></td><td align=right><table><tr><td class=w></td><td class=w></td><td class=l></td><td class=l></td><td class=w></td><td class=l></td></Tr></table></td><td>Gimnasio Mocho Navas, Petare, Venezuela</td><td class=rw>G</td><td>KO</td><td align=right>1</td><td align=right>6</td><td>peso superligero</td><td align=center>5</td><td align=center>9</td><td align=center>2</td><td align=center>1</td><td><a href="/media/index.php?title=Fight:1212131"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> tiempo: 0:24 | árbitro: <a href="list_bouts.php?human_id=403941&cat=referee">Domingo Salcedo</a>  </small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon query"></div></td><td><a href='date_search.php?yyyy=2006&mm=05&dd=01'>2006-05-01</a></td><td>64.0</td><td><a href="list_bouts.php?human_id=6926&cat=boxer">Catalino Julio</a></td><td>65.0</td><td class="c"><font color=#008000><b>3</b></font>-<font color=red><b>8</b></font>-<font color=#2B60DE><b>1</b></font></td><td align=right><table><tr><td class=l></td><td class=w></td><td class=w></td><td class=l></td><td class=l></td><td class=l></td></Tr></table></td><td>Gimnasio Luis Navarro, Los Teques, Venezuela</td><td class=rw>G</td><td>KOT</td><td align=right>1</td><td align=right>4</td><td>peso superligero</td><td align=center>0</td><td align=center>5</td><td align=center>0</td><td align=center>0</td><td><a href="/media/index.php?title=Fight:1091229"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> tiempo: 1:57 | árbitro: <a href="list_bouts.php?human_id=403944&cat=referee">Kelvin Cedeno</a>  </small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon query"></div></td><td><a href='date_search.php?yyyy=2006&mm=03&dd=17'>2006-03-17</a></td><td>63.4</td><td><a href="list_bouts.php?human_id=37482&cat=boxer">Vicente Seca</a></td><td>62.5</td><td class="c"><font color=#008000><b>0</b></font>-<font color=red><b>10</b></font>-<font color=#2B60DE><b>0</b></font></td><td align=right><table><tr><td class=l></td><td class=l></td><td class=l></td><td class=l></td><td class=l></td><td class=l></td></Tr></table></td><td>El Velodromo Teo Capriles, Caracas, Venezuela</td><td class=rw>G</td><td>KO</td><td align=right>1</td><td align=right>6</td><td>peso superligero</td><td align=center>0</td><td align=center>0</td><td align=center>0</td><td align=center>0</td><td><a href="/media/index.php?title=Fight:1075878"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> tiempo: 1:59 | árbitro: <a href="list_bouts.php?human_id=407722&cat=referee">Jose A. Garcia B.</a>  </small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon query"></div></td><td><a href='date_search.php?yyyy=2005&mm=07&dd=31'>2005-07-31</a></td><td></td><td><a href="list_bouts.php?human_id=288048&cat=boxer">Luis Jose Leon</a></td><td></td><td class="c"><font color=#008000><b>0</b></font>-<font color=red><b>2</b></font>-<font color=#2B60DE><b>0</b></font></td><td align=right><table><tr><td class=l></td><td class=l></td></Tr></table></td><td>Estadio del Palmar, San Mateo, Venezuela</td><td class=rw>G</td><td>KOT</td><td align=right>2</td><td align=right>4</td><td>peso superligero</td><td align=center>0</td><td align=center>0</td><td align=center>0</td><td align=center>0</td><td><a href="/media/index.php?title=Fight:996050"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> árbitro: <a href="list_bouts.php?human_id=407722&cat=referee">Jose A. Garcia B.</a>  </small><br></td><td class=right></tr><tr><td class=left></td><td><div class="icon query"></div></td><td><a href='date_search.php?yyyy=2005&mm=03&dd=05'>2005-03-05</a></td><td>62.0</td><td><a href="list_bouts.php?human_id=319413&cat=boxer">Erwin Romero</a></td><td>63.0</td><td class="c"><b><font color=grey>debut</font></b></td><td align=right><table><tr></Tr></table></td><td>Estadio Municipal, Coro, Venezuela</td><td class=rw>G</td><td>KO</td><td align=right>3</td><td align=right>4</td><td>peso superligero</td><td align=center>0</td><td align=center>0</td><td align=center>0</td><td align=center>0</td><td><a href="/media/index.php?title=Fight:903995"><div class="icon book-closed"></div></a></td><td class=right></td></tr><tr><td class=left></td><td class=c colspan=18><small> tiempo: 2:32 | árbitro: <a href="list_bouts.php?human_id=404884&cat=referee">Alejandro Heredia</a>  </small><br></td><td class=right></tr></table><p><table align=center>
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Revision as of 03:03, 18 December 2012

Introduction

Boxing Record Archive (BoxRec.com) provides Active and All boxer ratings, as calculated daily by its computer, to entertain its visitors. They have no official value beyond this Web site. The All ratings include both "Inactive" (retired) and "Active" boxers. The Active ratings include only those boxers who have had a bout within the past 365 days. (After a year of not fighting, a boxer is automatically designated "inactive" by the BoxRec computer. A boxer is also designated "inactive" if he has announced his retirement, even if he may have had a bout within the past 365 days.) Every boxer in the database is rated--even those with an 0-1 record.

These ratings are not influenced by subjective views or opinions, but are wholly dependent upon the bouts contained in the BoxRec server database. The BoxRec computer re-calculates the ratings daily at approximately 9:35 GMT. As the computer refreshes its calculations each and every day, a boxer may earn or lose ratings points with every bout he has fought since the last calculation--provided, of course, that a BoxRec Editor has entered that bout into the database before the recalculation. A boxer may also earn or lose points if bouts are added to any of his opponents' records, or to their opponents' records--even if the boxer himself has not had a fight since the last BoxRec computer calculation.

There admittedly are inaccuracies and anomalies, especially in the All-Time ratings, because of incomplete records in the BoxRec database. Although a boxer’s own record may be complete, his opponents’ records may not be complete. Pre-World War II boxers in particular are at somewhat of a disadvantage, vis-à-vis modern boxers. Their opponents’ records often are quite incomplete--because of the scarcity of source material or Editors' time--while the records of opponents of more current boxers often are quite complete. So, for example, while the records of Mike Tyson’s opponents may be quite complete--thereby earning Tyson a certain number of points and giving him a high ranking among the All-Time Heavyweights--the records of Young Stribling’s opponents may be extremely lacking, thereby giving Stribling fewer points and a much-lower All-Time rating. And it may appear to the casual BoxRec visitor that Stribling had fought many boxers making their professional debuts or having had only a handful of career bouts, when the truth is that not all of his opponents’ total career bouts have been entered yet into the database by an Editor. (Too many of those old-time bouts are forever lost in history because they were not reported by a newspaper or similar source, or the source was later destroyed.) But as the BoxRec Editors continue to research older resources and enter “new” historical bouts into the database, the rating of an old-time boxer like Stribling will gradually move up or down, even if his own record is complete--if bouts are added to his opponents’ records, or to his opponents' opponents' records, and so forth. So the BoxRec ratings are continually improving as new bouts are entered into the database. (Presently, some 2,000 current and old-time bouts are entered each week by the BoxRec Editors.)

Further, because of the very few women presently boxing professionally, with some weight divisions having only a handful of active female boxers, a woman with an 0-1 record will appear “world ranked” by BoxRec. This is simply an anomaly due to the few female entries in the database.

Ratings structure

All these ratings evaluate every day all bouts in the database in chronological sequence. A higher rated boxer should be expected to defeat a lower rated boxer with increasing probability by increasing rating difference.

Current ("Active") rating

  1. Every boxer gets a first rating of 0 before his first bout.
  2. After every bout, the ratings of the two boxers involved are changed depending on the bout's official result (KO, TKO, RTD, UD, PTS, NWS, MD, SD, DQ, TD, DRAW).
  3. The value of a result varies between v=1 and v=0.
  4. The clear decision factor varies between cd=1 and cd=0.
  5. The winner cannot lose points for KO, TKO, RTD, DQ, TD and decisions on points with cd=1
  6. KO, TKO, RTD are rewarded with full value v=1, cd=1.
  7. NWS is rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed. Clear decision factor cd=1.
  8. UD, PTS are rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed, clear decision factor cd=1. This is valid, if the score cards are not available.
  9. DRAW is rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed. Clear decision factor cd=0.
  10. MD, SD, DQ, TD are rewarded with full value v=1 for 12 rounds boxed and more and a lower value related to the number of rounds boxed. Clear decision factor cd=0.5. This is valid, if the score cards are not available.
  11. If the score cards are available, the value rewarded is in direct proportion to the rounds boxed, with full value v=1 for 12 rounds boxed and more. The clear decision factor is in proportion to rounds boxed and the mean score difference per judge. cd=1 for a mean score difference per judge of 50% of the rounds boxed.
  12. All bouts are regarded to have the same weight independent of titles.
  13. The winner gets a certain part of the opponent's points and a certain part of the rating difference to the opponent's rating.
  14. For a DRAW the rating of the higher rated boxer is reduced by some part of the point difference; the rating of the lower rated boxer is enhanced by the same amount of points.
  15. The full relative point reward is 33%. It is in direct proportion to the pre-bout rating of the defeated opponent.
  16. The winner can get up to 25 additional points per opponent's launch state rank
  17. The maximum launch state rank regarded is 15 - and so the maximum number of additional points is 375
  18. This value is reduced by the own rating, and it is set in direct proportion to the rounds boxed and the clearness of the decision
  19. This value is multipied by the maximum of 6 * the opponent's launch state+1 and the minimum of the opponent's rating and 25 * the opponent's launch state
  20. This value is divided by 25 * the opponent's launch state
  21. This value is multiplied by the quotient of the maximum of the opponent rating and 18 on one side and the sum of the maxima of the opponent rating and 18 and the maxima of the own rating and 18
  22. Launch states are:
    1. 0 = no recent win
    2. 1 = 1 recent win, 2 = 2 recent wins, 3 = 3 recent wins
    3. 4 = recent win over opponent with state 3, 5 = 2 recent wins over opponent with state 3, 6 = 3 recent wins over opponent with state 3
    4. 7 = recent win over opponent with state 6, 8 = 2 recent wins over opponent with state 6, 9 = 3 recent wins over opponent with state 6
    5. 10 = recent win over opponent with state 9, 11 = 2 recent wins over opponent with state 9, 12 = 3 recent wins over opponent with state 9
    6. 13 = recent win over opponent with state 12, 14 = 2 recent wins over opponent with state 12, 15 = 3 recent wins over opponent with state 12
  23. The ratings are decreased for moving up to higher weight divisions by the square of the reciprocal ratio of the weights limits of the divisions--and they are increased by the same factor for moving down the divisions.
  24. The rating of a boxer is reduced by 0% to 50%, if he didn't box an opponent with a rating of at least 50% to 0% of his own rating points within 18 months.
  25. The rating of a boxer is reduced by 50% for every time period of inactivity of 18 months.
  26. The pre-bout rating of a boxer successfully returning from inactivity is set to the lower value of his own rating before inactivity and the higher value of his own rating after inactivity and the pre-bout rating of his opponent.
  27. The pre-bout rating of a successfully debuting boxer is set to 25% of his opponents pre-bout rating.


Formula

If a boxer with a rating of r_a before the fight defeats a boxer b with a rating of r_b before the fight with result of value v and clear decision factor cd, the new ratings r_a_new and r_b_new after a fight are, earn_f is 33.3%:

  • earn = earn_f * v * (r_b*cd + (r_b-r_a)/(1+2*cd));
  • r_a_new = r_a + earn
  • r_b_new = r_b - earn

Additional points (no additional loss points accounted):

  • opponent in launch state n: v * cd * (25*n - r_a) * max(6*(n+1),min(r_b,25*n)) / (25*n) * max(r_a,18) / (max(r_a,18) + max(r_b,18))

Rating reduction caused by missing opponent quality:

  • r_new = r_old * (1 - 0.5*(1 - best_opp/r_old/0.5))


Examples

Boxer a KO boxer b, a has 1000 points, b has 500 points. launch state 4, v=1, cd=1,

  • earn= 0.33 * 1 * (500*1 + (500-1000)/(1+2*1)) = 111
  • r_a_new = 1000 + 111 = 1111
  • r_b_new = 500 - 111 = 389


Boxer a UD 6 boxer b, scores 59:55 58:56 58:56, a has 1000 points, b has 500 points.

  • A 6 rounder is rewarded with value 6/12, v=0.5
  • UD is rewarded with cd=1 at maximum
  • mean score difference per judge is (4+2+2)/3 = 2.667, which is rewarded in direct proportion to half the rounds boxed with cd= 2.667/3 = 0.89 at maximum
  • so cd=0.89
  • earn= 0.33 * 0.5 * (500*0.89 + (500-1000)/(1+2*0.89)) = 44
  • r_a_new = 1000 + 44 = 1044
  • r_b_new = 500 - 44 = 456


Boxer a SD 4 boxer b, scores 39:37 39:37 37:39, a has 1000 points, b has 500 points

  • A 4 rounder is rewarded with 4/12, v=0.333
  • SD is rewarded with cd=0.5 at maximum
  • mean score difference per judge is (2+2-2)/3 = 0.667, which is rewarded in direct proportion to half the rounds boxed 0.667/2 at maximum\
  • so cd=0.333
  • earn= 0.33 * 0.33 * (500*0.33 + (500-1000)/(1+2*0.33)) = -15
  • r_a_new = 1000 - 15 = 985
  • r_b_new = 500 + 15 = 515


More complex - Boxer a KO 4 boxer b, a has 30 points, b has 40 points, boxer b is in launch state 3, v=1, cd=1

  • earn= 0.33 * 1 * (40*1 + (40-30)/(1+2*1)) = 14
  • r_a_new = 30 + 14 = 44
  • r_b_new = 40 - 19 = 21
  • additional points:
  • 1 * 1 * (3*25 - 30) * max(6*4,min(40,3*25)) / 75 * 30 / (30+40)= 1 * 45 * 40 / 75 * 3 / 7 = 10
  • r_a_new = 44 + 10 = 54

All Time ("Inactive") Ratings

The All Time Rating for a boxer is the sum of 33% of the sum of annual rank points he gets for his annual ratings - and 33% of the sum of annual rank points of best defeated opponents - and 14% of his career top rating:

  1. the annual rating is the rating at the end of every year the boxer was active
  2. annual rank points = 200 / annual rank in division cluster
  3. the value of 200 annual points for the top boxer is reduced, if the annual rating of #10 in the division cluster is less than 100 for men, - and if the annual rating of #5 in the division cluster is less than 50 for women

Bout Star Ratings

All bouts are rated with 0 to 5 stars.

Men

  • 5 stars = both opponents have 331 ratings points at least ~ best 100 boxers
  • 4 stars = both opponents have 188 ratings points at least ~ best 300 boxers
  • 3 stars = both opponents have 83 ratings points at least ~ best 900 boxers
  • 2 stars = both opponents have 24 ratings points at least ~ best 2700 boxers
  • 1 stars = both opponents have 1 rating point at least = rated boxers
  • 0 stars = one opponents has not even 1 rating point at least = not rated boxers

Women

  • 5 stars = both opponents have 42 ratings points at least ~ best 30 boxers
  • 4 stars = both opponents have 28 ratings points at least ~ best 60 boxers
  • 3 stars = both opponents have 14 ratings points at least ~ best 120 boxers
  • 2 stars = both opponents have 4 ratings points at least ~ best 240 boxers
  • 1 stars = both opponents have 1 rating point at least = rated boxers
  • 0 stars = one opponents has not even 1 rating point at least = not rated boxers

Links