Author: Mike S.
Date: 19:12:54 02/04/01
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On February 04, 2001 at 18:54:47, Ralf Elvsén wrote:
>>http://math.bu.edu/INDIVIDUAL/mg/ratings.html
>
>There is a link to a graph showing the draw frequency for players
>within 100 rating points as a function of their rating. Interesting...
I have done a similar analysis, using the Big Database '99, to see the
percentage of draws when BOTH players were within a certain rating range of 100
elo each. The games were from 1990...1998:
rating range #games %draws
--------------------------
- 1800 151000 27
1801 - 1900 603 35
1901 - 2000 1319 38
2001 - 2100 4607 35
2101 - 2200 12477 36
2201 - 2300 28635 39
2301 - 2400 29498 48
2401 - 2500 25970 54
2501 - 2600 10567 56
2601 - 2277 53
Looks like the "many draws" start at around 2300 elo.
What may be more interesting is, that the number of black wins is "shrinking"
(so to say) more, than the number of white wins:
-1800 : 1-0 40%, 0-1 33%
2601+ : 1-0 30% (-10), 0-1 17% (-16)
Additionally, I took a look at (a smaller number of) games, where "rating
groups" - across 200 points this time - played against each other, i.e. players
within 1900...2100 against players with 2300...2500 elo. The results were not
surprising: The draw percentage was highest within the same ratings group, and
lower against stronger or weaker players, for all groups.
Regards,
M.Scheidl
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