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Number of games necessary to get approx PR
Posted By: eXtreme Gammon
Date: Tuesday, 11 February 2014, at 7:36 p.m.
In Response To: Number of games necessary to get approx PR (Tenland)
Teland How many games would you deem necessary to get a decent approximation of your PR against XG
As Jason says this is difficult to answer. PR on single game varies a whole lot. however for a 56 PR like me my guestimate is
100 games : +/ 1.6 PR 250 games : +/ 1.0 PR 1000 games : +/ 0.5 PR This is based on STDEV of 8.16 for my unlimited games (4000 games, overall PR of 5.5)
Stronger players should have much less variation and I guess for a 23 PR player the number above are about twice less (0.8 PR for 100 games)
For matches, a good rule of thumb is that a N point match usually takes N games. So 20 5point match should be equivalent to 100 games

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