Code: Select all
Rank Engine ELO + - Score AvOp Games
1 Rybka 1.0 Beta 64-bit 2953 +20 -19 77.1% -201.1 1088
2 Strelka 1.8 32-bit 2871 +21 -21 56.1% -46.2 734
3 Toga II 1.2.1a 32-bit 2860 +8 -8 48.1% +9.7 5987
4 Spike 1.2 Turin 2828 +7 -8 46.6% +22.9 7502
5 Naum 2.0 32-bit 2798 +9 -9 48.9% +1.4 5310
6 Glaurung 1.2.1 32-bit 2759 +9 -9 41.9% +58.1 5269
7 Scorpio 1.91 (5-men-egbb) 2732 +18 -18 50.7% -6.2 1090
8 Pro Deo 1.2 2722 +12 -12 43.4% +50.1 2531
9 Alaric 704 2720 +15 -14 49.8% +1.1 1649
10 Delfi 5.1 2716 +13 -13 50.6% -4.2 2225
11-12 Slow Chess Blitz WV2.1 2711 +10 -9 42.0% +59.1 4570
11-12 Zappa 1.1 64-bit 2711 +18 -17 46.7% +22.8 1120
13 Frenzee 3.0 64-bit 2709 +17 -17 49.7% +2.6 1221
14-15 List 5.12 2698 +12 -12 50.6% -4.5 2504
14-15 Pharaon 3.5.1 2698 +12 -12 38.6% +85.4 2504
16 WildCat 7 2696 +12 -12 47.2% +20.9 2631
17 SOS 5.1 2683 +13 -13 47.6% +17.0 2057
18 Pseudo 0.7c 2674 +12 -12 51.2% -12.6 2613
19 Ruffian 1.0.5 2673 +14 -14 50.4% -2.9 1922
20-21 Aristarch 4.50 2668 +12 -12 46.3% +28.8 2407
20-21 Petir 4.39 2668 +15 -15 45.1% +36.4 1533
22 Colossus 2007a 2661 +16 -16 44.0% +42.8 1371
23 The Baron 1.8.1 2654 +18 -18 47.7% +16.8 1074
24 Booot 4.13.1 2652 +23 -23 49.4% +4.0 637
25 Crafty 21.5 PS 64-bit 2649 +17 -17 43.3% +49.1 1264
26-27 Jonny 2.83 32-bit 2647 +15 -15 43.5% +49.4 1565
26-27 Smarthink 0.17a 2647 +18 -18 47.6% +17.1 1022
28 Fritz 5.32 2641 +18 -18 53.2% -25.7 1111
29 Anaconda 2.0.1 2637 +16 -16 48.7% +9.4 1427
30 Movei 0.08.403 2635 +17 -17 52.2% -16.9 1241
31 Thinker 4.7a 2632 +14 -14 48.2% +8.1 1929
32-33 AnMon 5.60 2617 +16 -16 46.3% +26.3 1392
32-33 Trace 1.37a 2617 +19 -19 43.7% +47.7 1012
34 Little Goliath Evolution 3.12 2614 +15 -15 53.4% -27.6 1690
35 Ufim 8.02 2613 +13 -13 49.9% -2.8 2165
36 Yace 0.99.87 2608 +22 -23 44.4% +36.9 672
Conditions:
Complete rating list and cross-tables (best free single-CPU engines in CCRL 40/4).Ponder off, General books (up to 12 moves), 3-4-5 piece EGTB
Time control: Equivalent to 40 moves in 4 minutes on Athlon 64 X2 4600+ (2.4 GHz)
A few comments:
Booot 4.13.1 and Strelka 1.8 should still play more games, to make their ratings more reliable. My goal is that every listed engine should play 30-game matches with at least 20 nearest opponents (10 higher rated and 10 lower rated), but I try to do more when possible.
Colossus 2007b and Alaric 707 are probably stronger than previous versions, but they need more testing.
32-bit versions of Naum 2.0 and Glaurung 1.2.1 are unfortunately higher rated than 64-bit versions at the moment. I don't know if it's an artifact or a real situation.
I list "Scorpio 1.91 (5-men-egbb)" because it is the latest official release from Daniel, but honestly I have no idea which version is the strongest. Shaun may be able to answer that as he tested Scorpio versions extensively.
Pro Deo 1.2 (also 1.3, 1.4 and 1.5) does not run on my machines, so I can't help filling the gaps for it. Waiting for Ed to release a fixed version.
Frenzee 3.0 64-bit 1-CPU was a surprise for me, it is listed as #13 currently.
"10-10-10" setting of Movei 00.8.403 is probably stronger than default setting, I may test it at some point in future. Right now "10-10-10" has too few games for me to list it.
Fritz 5.32 turned out to be stronger than Fritz 6 Light in our blitz conditions, to my surprise. So from now on Fritz 5.32 represents the free Fritz in our list.
Little Goliath Evolution 3.12 appears to play stronger without tablebases (its default setting) than with tablebases. The difference is not large though, so it still may be an artifact.
Trace 1.37a, Ufim 8.02 and Yace 0.99.87 played many new games recently, and received stable ratings.
Work will continue to expand the well-tested region of the rating list down to include more weaker engines. Personally I am much more enjoying to test and watch lower ranked engines than the top ones.
Best,
Kirill