The Week in Chess

Friday, November 29, 2013

Junior 13.08.4 x64 inflated ELO rating 3200

Right after I posted the last Junior 13.08.4 gauntlet matches yesterday, November 11, 2013, I noticed that the ELO rating of Junior in its website is 3200+.

I was intrigued of such very high rating so I looked at the reliable and trusted rating list sites and found that it was really overstated. The ELO rating of Junior at CCRL is 3026 while at CEGT it is 2841. The OWL rating list site has it at 2807.  The bloated ELO rating of Junior is almost equal to the rating of number one Stockfish 131109 x64 at 3211.  To check whether I am correct in my rating list statistics, I decided to have a one-on-one match between Junior 13.08.4 and Stockfish 131109.

And here is the result:

Junior 13.08.4 x64 vs. Stockfish 131109 x64 - Match 100R 1M1S
RankEngineScoreStJuS-B
1Stockfish 131109 x6488.5/100· ·· ·· ·83-6-11 1017.75 
2Junior 13.8.04 x64 11.5/1006-83-11· ·· ·· · 1017.75 


100 games played / Tournament finished

Tournament start: 2013.11.29, 01:28:19
Latest update: 2013.11.29, 08:08:40
Level: Blitz 1/1
Hardware: AMD Phenom(tm) II X4 945 Processor with 2.0 GB Memory
Operating system: Windows 7 Ultimate Professional Service Pack 1 (Build 7601) 64 bit
Table created with: Arena 3.0


ELO Rating estimate with BayesElo:
 Rank Name                               Elo    +    - games score oppo. draws
   1      Stockfish 131109 x64    166   80   80   100   89%  -166   11%
   2      Junior 13.8.04 x64        -166   80   80   100   12%   166   11%

Junior's score and the equivalent BayesElo rating shows that indeed it's published ELO rating estimate is very high.  There is no relative data shown to support it in its website, so it can be assumed that Junior's 3200+ ELO rating is for commercial purposes.

Download the match games here.

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