⚠ ANNOUNCEMENT: Summer Blitz Championship 2026 Dates
Summer Blitz 2026 will run June 15 - July 15, 2026. Registration opens April 1, 2026. More details →
About ICCRL
The International Computer Chess Rating List (ICCRL) is an independent organization established in 2014 to provide objective, scientific ratings of computer chess engines worldwide. We maintain the most comprehensive and rigorous testing methodology in the computer chess community, producing an authoritative public rating list that is updated on a consistent schedule.
Our mission is to advance computer chess through fair competition, transparent testing, and standardized benchmarking. All testing is conducted on uniform hardware under identical conditions to ensure rating accuracy and reproducibility, and every result is backed by large game samples.
ICCRL also hosts recurring competitions, including seasonal rapid and blitz championships, where engines compete head-to-head under the same standards used for our list. These events highlight emerging strength, time-management skill, and stability across diverse engine types.
ICCRL serves engine developers, researchers, and chess enthusiasts by providing reliable strength measurements and fostering innovation in chess programming. Since our founding, we have tested over 487 engines and played more than 1.2 million rated games.
Testing Methodology
- Hardware: Intel i7-13700K, 16GB RAM
- Hash Size: 1024 MB
- Cores: 4 per engine
- Tablebases: Syzygy 6+7-man
- Opening Book: 8-move variety
- Games/Engine: 1000+ minimum
How to Participate
Engine Requirements:
- UCI protocol support
- Freely available or authorized
- No internet dependency
- Stable (no crashes/illegal moves)
Submission: Email your engine binary and documentation to submissions@iccrl.org
Neural network engines: include all required network files
Current Statistics
| Rated Engines: | 487 |
| Total Games: | 1,284,592 |
| Active Competitions: | 3 |
| Countries: | 42 |
| Top Engine: | Stockfish 17 |
| Top Rating: | 3642 |
Latest News
January 4, 2026
Summer Blitz Championship 2026 - Registration Opens April 1
The fastest event on the ICCRL calendar. June 15-July 15, 2026. All engines play minimum 400 blitz games across Open, Traditional, and Neural Network divisions.
December 29, 2025
December 2025 Rankings Released
Stockfish 17 maintains top position with rating of 3642. Dragon 3.3 shows impressive gains moving to 2nd place.
November 10, 2025
Updated Testing Infrastructure
Migration to new testing servers completed. 30% increase in testing capacity for 2026.
October 22, 2025
Chess960 Rating List Launched
New Fischer Random Chess variant ratings now available. 156 engines tested in initial run.
Upcoming Events
Summer Blitz Championship 2026
June 15 - July 15, 2026
Blitz showcase focused on speed and precision.
Registration opens: April 1, 2026
Sponsors & Partners
ICCRL is made possible through the generous support of our sponsors and partners who provide infrastructure, computing resources, and financial backing.
PRIMARY SPONSOR
cerebrium.ai
Providing dedicated GPU clusters and high-performance computing infrastructure for neural network engine testing since 2022.
Interested in sponsoring ICCRL? Contact us at sponsors@iccrl.org