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Normalising PR’s in Matches

Posted By: Rick Janowski
Date: Sunday, 30 June 2013, at 8:24 p.m.

In Response To: Normalising PR’s in Matches (David Rockwell)

I am not advocating how the cube and checker prs are measured at all. What I am advocating is normalising the actual proportions of cube to checker decisions made to a fair level reprsentative of the normal level.

For example, two players in Iancho's database only needed to make cube decisions from 5% of their overall decisions, and conversely two other players had to make over 25% cube decisions, compared to the rest of the field whose percentage of cube decisions where in the band 10-20%. This was beneficial to the former and onerous to the latter with a maximum difference between overall pr and normalise pr of 0.4, moving 8 place in the table.

The effect of poor cube or solid cube action in being able to engineer a genuine reduction in number of cube decisions won't generally change the proportions to any significant extent, in my opinion. If a player with a checker pr of 4 and cube pr of 8, gets an overall pr of 4.4 with one set of 50 matches where he had 10% cube decisions, then in the next set gets a overall pr of 4.8 with the same base pr values but 20% cube decisions, do we think his overall level of play has worsened? Or do we think instead that there were factors completely outside the player's control that were the major (if not sole) cause of the apparent lack of performance?

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