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:
|1||Damirs Killer 77||2908||122||1100||68.32||751.5||569||166||365||10|
|3||Deep Hiarcs 14||2905||81||1100||61.64||678||542||286||272||0|
|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|
|8||Crab PGO x64||2809||-9||1100||48.55||534||429||461||210||0|
|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|
Download the computer chess engines tournament games here.