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League


New Chess Engine Testing Policy

 Chess Engines Diary League - 01.01.2026

Hardware & Technical Specifications

To ensure fair and consistent results, all engines in the Chess Engine League (February 2026 Edition) compete under the following conditions:

Computer Hardware

  • CPU: [AMD Ryzen 9 6900HX / Asus Zenbook]

  • Cores/Threads: [4 Threads per engine]

  • RAM: [32 GB DDR5]

  • GPU: [ NVIDIA GEFORCE RTX 4080]

Tournament Settings

  • Time Control: [3 minutes + 3 seconds increment (3' + 3')]

  • Hash Size: [ 2048 MB]

  • Opening Book: [Perfect 2021]

  • Tablebases: [5-man]

  • Contempt: 0 (Disabled for all engines)

  • GUI / Controller: [Arena GUI/ Aquarium GUI]

Elite Chess Engine League - Top 64

The league consists of 64 engines—mirroring the 64 squares of a chessboard. The competition is structured into four divisions: Leagues 1, 2, 3, and 4. A system of promotion and relegation will be applied at the end of each season.

Top performers from the Qualifying Rounds will advance to the 4th League. To be eligible for the qualifying stage, an engine must meet the following criteria:

a) New engine versions must achieve a score of at least 50% in a preliminary test against our benchmark (either Critter 1.6a or the engine currently ranked 70th in the CEDR rankings).

The Qualifying Rounds will be held within a single group, with the specific tournament format determined by the total number of "promising" engines participating.

The time control remains 3 minutes plus 3 seconds increment per move (3'+3").

See also post: New Chess Engine Testing Policy (Starting Jan 1, 2026)

#chessenginesdiary

The 07/2026 edition of the Chess Engine League (CEDR) - completed.
TOP-64 League, strongest chess engines CEDR
1 League Season 07/2026 Rating Score note
1. PlentyChess 8.0.0 3724 17.0  
2. Halogen 16.7.2 3694 16.0  
3. Reckless 0.10.0-dev-7300f044 3737 15.5  
4. Stockfish 18 JA 3748 15.5  
5. Integral 7 JA 3719 15.5  
6. Lc0 0.32.1 3699 15.5  
7. Obsidian 16.15 SE 3726 15.0  
8. Tarnished 6.0 3687 15.0  
9. Viridithas 20 JA 3686 15.0  
10. Berserk 14 JA 3702 15.0  
11. Quanticade Phoenix 4.0 3685 15.0  
12. Caissa 1.25 JA 3703 14.5  
13 Dragon 3.3 3704 14.5  
14. Uralochka 3.42a 3659 14.5  relegation
15. Alexandria 9.0.0 JA 3716 14.0  relegation
16. Pawnocchio 2.0.1 3697 12.5  relegation
         
2 League Season 07/2026 Rating Score note
1. PZChessBot 7.1 3652 17.5  promotion
2. Stormphrax 8.0.0 3685 16.0  promotion
3. Horsie 1.1.0 3680 15.5  promotion
4. Astra 7.0 JA 3680 15.5  
5. Cinder 0.5.0 3642 15.5  
6. Raphael 4.2.0 3663 15.5  
7. Motor 0.9.0 3670 15.5  
8. Seer 2.8.0 JA 3639 15.0  
9. RubiChess 20250606 JA 3691 15.0  
10. Clover 9.1 3685 15.0  
11. Renegade 1.3.0 JA 3619 14.5  
12. Starzix 6.1 JA 3665 14.5  
13. Lizard 11.2 3669 14.5  
14. Devre 6.39 JA 3647 14.0  relegation
15. Arasan 25.4 JA 3668 13.5  relegation
16. Titan 1.1.0 JA 3638 13.0  relegation
         
3 League Season 07/2026 CEDR Score note
1. Rebel 16.3 3640 17.5  promotion
2. Booot 7.4 3644 16.5  promotion
3. Velvet 9.0.0 dev-7 JA 3643 16.0  promotion
4. Igel 3.6.3 JA 3641 16.0  
5. Revenge 4.0 3626 16.0  
6. Akimbo 1.1.0 JA 3622 16.0  
7. Spaghet-BologNNese 1.0 3615 15.5  
8. Dragon free 3609 15.0  
9. Equisetum 1.30 JA 3476 15.0  
10. Clarity 8.0.0 JA 3604 14.5  
11. Altair 7.2.1 JA 3587 14.5  
12. Koivisto 9.20 JA 3607 14.5  
13. Elixir 3.0 JA 3580 13.5  
14. Slowchess 2.9 3551 13.5   relegation
15. Minke 6.0.0 JA 2400 13.0   relegation
16. Fire 10 3574 13.0   relegation
   
4 League Season 07/2026 CEDR Score note
1 Torch-4 1.01 3200 23.0  promotion
2 Peacekeeper 3.01 JA 3598 18.5  promotion
3 Rofchade 3.1 3615 18.0  promotion
4 Tenax 1.0 3543 17.0  
5 Cataphract 1.5.1 2400 17.0  
6 Zangdar 6.1.1 2960 17.0  
7 Patricia 5.0 3426 16.0  
8 Minic 3.46 JA 3510 15.5  
9 Ynode 0234 2400 15.0  
10 Pawn 4.0.4 JA 3529 15.0  
11 Texel 1.13a4 JA 3548 14.0  
12 Wasp 7.16 3507 13.5  
13 Sirius 9.0 3505 12.5   relegation
14 Stash 37.10 JA 3422 12.5   relegation
15 Monty dev-20260512 3421 10.5   relegation
16 Prune 4.0.1 2400 5.0   relegation
   
Challenger Group A
A Season 07/2026 Rating Score note
1 Icarus 1.1 JA 3663 18.5  promotion
2 Winter 5.0 JA 3467 16.0  promotion
3 Bread 3.1.0 JA 3466 15.0  promotion
4 Willow 4.0 3485 14.0  promotion
5. Tucano 12.17 JA 3482 13.5  
6. Rice 8.0 3463 13.0  
7. Smallbrain 7.0 JA 3410 13.0  
8. Leorik 3.2 2998 12.5  
9. Arcanum 2.8 3317 12.0  
10. Superultra 2.1 JA 3519 12.0  
11. Marvin 6.3.0 JA 3451 12.0  
12. Midnight 9 JA 3440 12.0  
13. Cheng4 0.48 3439 12.0  
14. Grail 2.0.1 2400 12.0  
15. Expositor 5 JA 3370 12.0  
16 Lambergar 1.5 3364 11.5  
17 Illumina 3.0 JA 2400 11.5  
18 Lynx 1.11.0 3274 11.0  
19 Anduril 0.1 dev.ea5a JA 3116 11.0  
20 Cwtch 6 2400 10.5  
21 Nalwald ab11891 JA 3310 9.5   relegation
22 Weiss 2.1 JA 3437 9.0   relegation
23 EveAnn 5.1 2215 9.0   relegation
24 Counter 5.5 3389 9.0   relegation
25 Sapling 1.2.7 3440 8.5   relegation
Challenger Group B
B Season 07/2026 Rating Score note
1 Chess System Tal 2.07 3633 19.5  promotion
2 Triumviratus 5.1 2400 19.5  promotion
3 Gargantua 2.1 3122 16.5  promotion
4 Hypersion 3.1 2400 16.0  promotion
5. Stallion GB Edition 2400 15.0  promotion
6. Shadow 0.3 2400 13.5  
7. Chessnix 1.4 2400 13.5  
8. Jackal 2.0.0 2400 13.5  
9. Xiphos 0.6.1 JA 3351 13.5  
10. RukChess 4.2.0 JA 3331 13.0  
11. Pedantic 2.1.0 3360 13.0  
12. Avalanche 3.0.0 3358 12.5  
13. MrBob 1.3.0 JA 3364 12.5  
14. Caligula 7.0 JA 2761 12.5  
15. Frozenight 7.0.0 JA 3323 11.5  
16 Odonata 1.1.0 3297 11.0  
17 Gaia 4.1.3 2400 10.5  
18 Drofa 4.1.1 JA 3285 10.5  
19 Zahak 10.0 JA 3330 10.5  
20 Sturddle 2.5.0 2400 10.5  
21 Tunguska 2.1 2638 9.5    relegation
22 Laser 1.8 JA 3287 9.0    relegation
23 Defenchess 2.3 JA 3300 8.0    relegation
24 Svart 6 b2c7255 JA 3265 5.5    relegation
25 Quirky 3.0 JA 2400 0.0    relegation
Challenger Group C
C Season 07/2026 Rating Score note
1 Panda 2.0 2400 19.5  promotion
2 Weiawaga 6.0 2400 18.5  promotion
3 Lunar 0.4.0 2400 18.0  promotion
4 Vajolet2 3.2 3179 15.5  promotion
5. Myrddin 0.96 JA 2629 15.0  promotion
6. Perseus 1.1 JA 2400 14.5  
7. Maestro 1.2.1 JA 2400 14.5  
8. Petrel 3.5 JA 2400 14.0  
9. Bitbit 1.6 2400 14.0  
10. Publius 1.1 2400 13.5  
11. Solo 2.2.0 JA 2400 13.0  
12. Maelstrom 3.3.0 3315 12.5  
13. Demolito 2025-12-16 3235 12.5  
14. Kociolek 2.1 JA 2400 12.5  
15. Priessnitz 2.0.1 JA 2400 12.0  
16 Flounder 0.5.0.2 3213 11.5  
17 Jet 1.2 3245 11.0  
18 Bit-Genie 9.24 JA 3051 11.0  
19 Cadie 2.1 JA 3010 10.5  
20 Invictus r391 JA 2793 9.5  
21 Monolith 3 3099 9.0  relegation
22 Beef 0.3.6 JA 2400 8.5  relegation
23 Pounce 3.0.0 2400 8.0  relegation
24 Fizbo 2 JA 3064 1.5  relegation
25 Danasah 9.1 JA 3244 0.0  relegation
Challenger Group D
D Season 07/2026 Rating Score note
1 Turbulence 0.0.8 JA 2400 45.0  promotion
2 Yakka 1.5 2894 35.5  promotion
3 Orion 1.1 3084 33.5  promotion
4 Lozza 10 2847 33.0  promotion
5. Dog 4.1 2400 32.5  promotion
6. Gecko 0.40.1 2400 32.0  
7. ChessBrainVB 4.10 3203 28.5  
8. Admete 1.9.0 2639 28.0  
9. Aku 2025.7.9 3174 26.5  
10. Olithink 5.11.9 JA 2845 26.5  
11. Throne 0.2 2400 26.0  
12. Chess-3 4.0 2400 25.0  
13. Wize 1.0 JA 3014 24.0  
14. Seawall 20250322 JA 2960 21.0  
15. Revolver 2.0 JA 2400 21.0  
16 Truncator 1.0 2400 20.5  
17 4ku 5.1 3081 19.5  
18 Jackychess 25.12 JA 2400 19.0  
19 Tomcat 1.0 JA 2400 18.5  
20 Bobcat 8.0 JA 2782 18.0  
21 Ember 1.1.1 2400 18.0  relegation
22 Rusty-rival 1.0.43 2400 16.0  relegation
23 KnightX 4.92 2901 14.0  relegation
24 MadChess 3.3 2818 11.0  relegation
25 Fatalii 0.10.1  2385 7.5  relegation
Challenger Group E
E Season 07/2026 Rating Score note
1 Coda 0.9.2 2400 51.0  promotion
2 Hobbes 2.1 3677 51.0  promotion
3 Rose 1.0.0 JA 2400 48.0  promotion
4 Thrawn 3.1 2415 45.5  promotion
5. Askaig 20260704 2400 44.5  promotion
6. Schneckbert 3.0 JA 2400 43.0  
7. Clockwork dev-20260712 2400 43.0  
8. Bagatur.cpp 1.0 2400 42.0  
9. Sable 2.0.0 2400 39.5  
10. Kobra 2.1 2290 36.5  
11. Onyx 1.6 2400 36.5  
12. JustBot 0.2.0 2400 30.0  
13. Noggin 2.1 2400 28.5  
14. Eleanor 4.1 JA 2400 28.0  
15. Sentinel 2.0 JA 2400 27.5  
16 Basilisk 1.8.0 2400 25.5  
17 Pluto 1.0.1 2400 24.5  
18 Cheese 3.3.0 JA 3081 24.5  
19 Byte-knight 4.0.0 2400 24.0  
20 Lux 5.0 2671 21.5  
21 Chal 1.4.1 2400 18.0  
22 Ratsu 2.1.0 2400 17.0  
23 Drosophila 1.6 JA 2789 14.5  
24 K2 1.0 alpha dev.9b2a JA 2624 14.0  relegation
25 Soomi V1.2.0B 2400 9.5  relegation
26 Kreveta 2.3.1 2400 9.0  relegation
27 BikJump 3.1 2400 8.5  relegation
28 Radiance 4.4 2400 4.0  relegation
29 Viking R4 2400 3.0  relegation

CEDR Chess Engines League archived results

Season 03/2026, 
1 League, 2 League, 3 League, 4 League, Qualifiers. 

Season 02/2026, 

 
Season 07/2025:
1 League, 2 League, 3 League. Qualifying: E01, E02, E03,E04,E05,E06,E07, E08. 

Season 06/2025:
1 League, 2 League, 3 League. Qualifying: E01, E02, E03,E04,E05,E06,E07, E08. 


♖ edition 03/2025 ♖ edition 06/2024 ♖ edition 05/2024 ♖ edition 04/2024 ♖ edition 03/2024 ♖ edition 01/2024♖edition 01/2023 ♖edition 02/2023  ♖ edition 03/2023  ♖ edition 04/2023   ♖ edition 05/2023  ♖ edition 06/2023  ♖ edition 07/2023  ♖ edition 08/2023  ♖ edition 01/2015 ♖ edition 08/2014 


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Chess Engines Diary League: games, tables and pdf.


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