The Week in Chess

Saturday, July 13, 2013

Damirs Rybka Killer 77, Winner Second Stringers Tournament - 100 Rounds

A special 100 round tournament was conducted for the chess engines that fall just below the strongest chess engines category.  Damirs Rybka Killer topped the tournament with 68.32% score.

The original plan was to split the strongest chess engines into 2 groups of 20 chess engines each. This is to speedup the completion of the gauntlet tournament whenever there is a new engine released and to separate the weaker engines which look like an amateur when paired with the very strong chess engines.  64 bit versions were used whenever available.

When the initial tournament was through, I found with great disappointment that most 64 bit versions were below the ELO rating of their corresponding 32 bit versions. These are OpenCritter 1.1.37 x64, Crab PGO x64, Tinapa 1.01 x64, Protector 1.5.0 x64 and Chiron 1.1 x64. When I researched the Internet for clues, I discovered that OpenCritter was ported to C++ because of 64bit problems with the Delphi Pascal compiler.  I am not sure with the others, but the authors may shed some explanation or the community may have experienced the same situation.

Incidentally, this second stringers tournament led to the dilution of the ELO rating of the top chess engines where most lost 16 points without even playing a single game. It seems that as more games are conducted below that of the strongest chess engines, the bloated ELO ratings of strongest engines with high number of games will normalize.

Here is result of the gauntlet tournament:
Rank Engine ELO Raw Games Score% Points Win Loss Draw Chg
1 Damirs Killer 77 2908 122 1100 68.32 751.5 569 166 365 10
2 Tankist 3.1 2923 105 1100 65.18 717 547 213 340 1
3 Deep Hiarcs 14 2905 81 1100 61.64 678 542 286 272 0
4 Szint GM 2906 64 1100 58.82 647 488 294 318 -5
5 Naum 4.2 x64 2864 33 1100 53.86 592.5 465 380 255 -20
6 OpenCritter 1.1.37 x64 2839 20 1100 52.05 572.5 426 381 293 0
7 Sjeng 2010 2797 -3 1100 49.14 540.5 430 449 221 4
8 Crab PGO x64 2809 -9 1100 48.55 534 429 461 210 0
9 Spike 1.4 2834 -19 1100 46.64 513 391 465 244 -10
10 Tinapa 1.01 x64 2764 -51 1100 42.27 465 380 550 170 0
11 Protector 1.5.0 x64 2695 -117 1100 33.14 364.5 254 625 221 0
12 Chiron 1.1a x64 2585 -226 1100 20.41 224.5 152 803 145 0
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Download the computer chess engines tournament games here.

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