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Snowie ER and XG elo - the new Performance rating (PR) system

Posted By: eXtreme Gammon
Date: Monday, 23 November 2009, at 12:58 a.m.

In Response To: Snowie ER and XG elo (Mislav Radica)

Version 1.10 will introduce a new option: "display performace rating"

The formula is

  • PR = -(equity error per decision)*500
  • Elo = 2240 - (equity error per decision)*16500

So Elo = 2240 - PR*33

PR is different than the Snowie ER, as eXtreme Gammoon sill does not take into account force move, dances and irrevalent moves (irrevalent checker play are the one where the best and worse play equity difference is under 0.001). However the number are comparable.

Here is the updated table from the help file.

equity per decision Category Name Color Code Elo Equivalent Performance Rating

P>+0.0000

 Wow! Underline Black 2240 and more Less than 0.0
+0.0000>P>-0.0050 World Champ Underline Black 2158-2240 0.0-2.5
-0.0050>P>-0.0100 World Class Black 2075-2158 2.5-5.0
-0.0100>P>-0.0150 Expert Black 1993-2075 5.0-7.5
-0.0150>P>-0.0250 Advanced Green 1828-1993 7.5-12.5
-0.0250>P>-0.0350 Intermediate Green 1663-1828 12.5-17.5
-0.0350>P>-0.0450 Casual Player Red 1498-1663 17.5-22.5
-0.0450>P>-0.0600 Beginner Red 1250-1498 22.5-30.0
-0.0600>P Distracted Red 1167and less 30.0 and more

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