The Week in Chess

Tuesday, October 7, 2014

Stockfish 011014 IPx x64 vs. Strong Chess Engines Selection

Stockfish 011014 IPx x64 is a UCI chess engine by IPman released last October 2, 2014.

There was a post I read recently from one of the chess engine forums that the latest clone compiled by IPman is the strongest. I just posted the strongest Stockfish clone I ever tested named Sugar 2.0b, so I proceeded to test the recent IPman compile to determine if the claim was true.

As can be seen from the result of the gauntlet matches, Stockish 011014 IPx and Sugar 2.0b have a draw score of 50-50 and both have similar score patterns by winning against Komodo 8 and Gull 3 while losing against Houdini 4 Pro and Stockfish 14100223. However, Stockfish 011014 IPx had a lower score percentage overall with a 3142.27 ELO rating which is lower than Sugar 2.0b's ELO of 3151.63.

As the gauntlet matches were over, I noticed that the author appearing in the console when the Stockfish 011014 IPx is run was Marco Costalba. I realized that this may not be a true clone but just a compilation by other person. Also the rating list seems to be ugly with engines bearing the same name. For the moment, I just publish this for informational purposes but will clean-up later if IPman will not claim responsibility of his compilation and change the engine name plus authorship to signify that he is serious with cloning for improvement.



Rank Engine True ELO Raw ELO Change Games Score% Points Win Loss Draw
1 Houdini 4 Pro x64 3120.56 143.09 1.11 100 53.00 53.0 28 22 50
2 Stockfish 14100223 x64 3157.73 125.54 -0.50 100 50.50 50.5 16 15 69
3 Stockfish 011014 IPx x64 3142.27 122.03 3142.27 2400 66.79 1603.0 1067 261 1072
4 Sugar 2.0b x64 3151.63 122.03 -0.41 100 50.00 50.0 16 16 68
5 Komodo 8 x64 3134.10 108.00 -0.05 100 48.00 48.0 20 24 56
6 DON 220914 x64 3054.02 61.86 1.34 100 41.50 41.5 11 28 61
7 Gull 3 x64 3061.97 61.86 0.65 100 41.50 41.5 19 36 45
8 Samsung x64 3040.69 32.51 0.44 100 37.50 37.5 18 43 39
9 Mars 3.3 x64 3003.43 9.68 1.15 100 34.50 34.5 11 42 47
10 Robodini 1.1 x64 3042.46 -2.07 -0.34 100 33.00 33.0 14 48 38
11 Critter 1.6a x64 3015.66 -10.06 0.13 100 32.00 32.0 8 44 48
12 Houdini 1.5a x64 3041.16 -18.18 -1.12 100 31.00 31.0 10 48 42
13 Strelka 6 3068.14 -26.45 -1.27 100 30.00 30.0 10 50 40
14 Robbolito 0.21Q x64 2951.58 -30.64 0.87 100 29.50 29.5 10 51 39
15 Saros eXp R5 x64 2957.26 -30.64 0.90 100 29.50 29.5 9 50 41
16 Firenzina 2.4.2 xTreme x64 2974.99 -39.16 0.21 100 28.50 28.5 12 55 33
17 Bouquet 1.8 x64 2967.63 -43.48 0.25 100 28.00 28.0 6 50 44
18 Pan Chess 0.611 x64 2989.11 -43.48 -0.28 100 28.00 28.0 4 48 48
19 Fire 3.0 x64 2995.33 -52.27 -0.26 100 27.00 27.0 6 52 42
20 Ivanhoe 1945a x64 2954.34 -52.27 0.37 100 27.00 27.0 6 52 42
21 Tactico Power 2011 x64 2948.95 -52.27 0.42 100 27.00 27.0 8 54 38
22 Igorrit 0.086v9 x64 2945.65 -61.27 0.36 100 26.00 26.0 10 58 32
23 Elektro 1.0 x64 2925.38 -65.85 0.92 100 25.50 25.5 5 54 41
24 Strong Chess 1.0 x64 2941.81 -126.44 -0.92 100 19.50 19.5 2 63 35
25 LEOpard 0.7c x64 2936.91 -132.07 -0.63 100 19.00 19.0 2 64 34

Download the gauntlet matches PGN games here.

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