MacChess Belofte

Dedicated to chess on Mac

Information for Chess players, Chess programmers and Apple users

Updated on : 20/02/2021
Version 1.51
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XBoard tournaments

This page lists results of different engines that participate in an XBoard tournament. We will try to obtain a rating based on the tournament results. Please look below for the elo ranking of the different engines.

The tournaments are being played with following rules:

  • No thinking on the opponents time.
  • 30 moves / 30 minute for first 30 moves, thereafter, 30 minutes KO.
  • 2 games per match, one for each colour.
  • Total memory allocation per engine < 512 MB (including program size).
  • Total disk space allocation for engine source, opening book and endgame tablebases < 10GB.
  • Maximum processors usage: 2.
  • Xboard compatible.
  • Running on Mac OS X 10.3 or 10.4 with G4 processor
  • Playing an invalid move causes game to be lost.
  • Any violation of above rules causes game to be lost.
  • Engine may be improved in between consecutive games.
  • Source code must be available. (I need to compile them before I can include them in the tournament.) Exceptions can be made but need to be discussed first.

Participants:

  • Phalanx XXII
  • Crafty 19.4
  • Crafty 19.13
  • Crafty 19.13 SMP
  • Crafty 19.17 SMP
  • Pepito 1.59
  • GNUChess 5.07
  • Sjeng 11.2

Past participants:

  • Ghotmog 0.3 - retired 03/09/2005 - will be replaced by new engine
  • Ghotmog 1.0 - retired 03/09/2005 - will be replaced by new engine

Downloads:

  • The script used for the tournament is available from the download pages.

Advanced tournaments

  • Please refer to the belofte program which contains scripts that are easily modifiable and which you can include in your tournaments. Those scripts use the cross-platform ordo and cutechess applications.

Results:

Preselection round, 10 min KO games. Used to calculate indicative start ratings. Completed 01/11/2004.

Total Percent
Phalanx   0 0 0 0,5 2 2 1,5 2 8,0 50%
Crafty 19.4 2   0,5 1 0 1 2 0 2 8,5 53%
Crafty 19.13 2 1,5   2 1 2 0,5 2 2 13,0 81%
Crafty 19.17 SMP 2 1 0   2 2 2 2 2 13,0 81%
Crafty 19.13 SMP 1,5 2 1 0   2 2 2 2 12,5 78%
Ghotmog 0.3.0 0 1 0 0 0   1 1,5 2 5,5 34%
Pepito 1.59 0 0 1,5 0 0 1   1,5 2 6,0 38%
GNU 5.07 0,5 2 0 0 0 0,5 0,5   1 4,5 28%
Sjeng 11.2 0 0 0 0 0 0 0 1   1,0 6%

First tournament based on 30 min KO games. Still used to calculate ratings based on EloStat. Completed 03/09/2005.

Total Percent
Pepito 1.59   0,5 1 0,5 0 0 2,0 40%
GNUchess 5.07 0,5   0,5 0 0 0 1,0 20%
Sjeng 11.2 0 0,5   0 0 0 0,5 10%
Phalanx 0,5 1 1   0 0 2,5 50%
Crafty 19.4 1 1 1 1   0,5 4,5 90%
Crafty 19.13 1 1 1 1 0,5   4,5 90%

Elo ranking as of 03/09/2005:

Elo Factor Games Prev. Elo Prev. Games Adjust
Crafty 19.13 2313 23 2600 18
Crafty 19.4 2313 23 2100 18
Phalanx 1996 23 2000 18
Pepito 1.59 1938 23 1800 18
GNU 5.07 1796 23 1600 18
Sjeng 11.2 1678 23 1200 18
Estimated elo
Crafty 19.17 SMP 2600 18 2600 18 +0
Crafty 19.13 SMP 2500 18 2500 18 +0
Gothmog 1.0 2100 18 2100 18 +0
Ghotmog 0.3.0 1700 18 1700 18 +0

Based on an estimated rating for the Crafty engine, the other ratings can be calculated. For each engine, the rating will be adjusted after each tournament.

The crafty 19.17 engine approximatly calculates 500 K nodes per second. This means that the crafty ranking can be compared to the ranking on a windows machine.

Note: The calculate factor will also be adjusted to 24 once 1900 is reached and to 16 once 2100 is reached, it will be lowered by 4 for every 12 games until a factor of 12 is reached. New entries after these will be entered at 1400.

It would be better if those calculations were based on ordo. ;-)