The Swedish Chess Computer Association (, SSDF) is an organization that tests computer chess software by playing chess programs against one another and producing a rating list. On September 26, 2008, the list was released with Deep Rybka 3 leading with an estimated Elo rating of 3238. Rybka's listing in June 2006 was the first time a program on the list has passed the 2900 mark. In the year 2000 the ratings of the chess engines in the SSDF rating pool were calibrated with games played against humans.
The SSDF list is one of the only statistically significant measures of chess engine strength, especially compared to tournaments, because it incorporates the results of thousands of games played on standard hardware at tournament time controls. The list reports not only absolute rating, but also error bars, winning percentages, and recorded moves of played games.
The SSDF's current testing platform includes an AMD Ryzen 7 1800X 8-Core 3.6 GHz with 16 GB of RAM-memory and a 64-bit operating system. On this platform they have chosen to add the 6-piece Syzygy endgame database, installed on SSD, for the programs that are able to use it. From 1984 to 2020, the SSDF top program increased by 1942 points, an average of 54 points per year. The SSDF list was discontinued on December 31, 2023.
Rating list year-end leaders
+ Rating list year-end leadersYearProgramHardwareRating1984Novag Super Constellation6502 4 MHz16311985Mephisto Amsterdam68000 12 MHz18271986Mephisto Amsterdam68000 12 MHz18271987Mephisto Dallas68020 14 MHz19231988Mephisto MM 4 Turbo Kit6502 16 MHz19931989Mephisto Portorose68020 12 MHz20271990Mephisto Portorose68030 36 MHz21381991Mephisto Vancouver68030 36 MHz21271992Chess Machine Schröder 3.0ARM2 30 MHz21741993Mephisto Genius 2.0486/50-66 MHz22351995MChess Pro 5.0Pentium 90 MHz23061996Rebel 8.0Pentium 90 MHz23371997HIARCS 6.049MB P200 MMX24181998Fritz 5.0 PB29%67MB P200 MMX24601999Chess Tiger 12.0 DOS128MB K6-2 450 MHz25942000Fritz 6.0128MB K6-2 450 MHz26072001Chess Tiger 14.0 CB256MB Athlon 120027092002Deep Fritz 7.0256MB Athlon 1200 MHz27592003Shredder 7.04 UCI256MB Athlon 1200 MHz27912004Shredder 8.0 CB256MB Athlon 1200 MHz28002005Shredder 9.0 UCI256MB Athlon 1200 MHz2808 2006Rybka 1.2256MB Athlon 1200 MHz29022007Rybka 2.3.1 Arena256MB Athlon 1200 MHz29352008Deep Rybka 32GB Q6600 2.4 GHz32382009Deep Rybka 32GB Q6600 2.4 GHz32322010Deep Rybka 32GB Q6600 2.4 GHz32272011Deep Rybka 42GB Q6600 2.4 GHz32162012Deep Rybka 4 x642GB Q6600 2.4 GHz32212013Komodo 5.1 MP x642GB Q6600 2.4 GHz32412014Komodo 7.0 MP x642GB Q6600 2.4 GHz32952015Stockfish 6 MP x642GB Q6600 2.4 GHz33342016Komodo 9.1 MP x642GB Q6600 2.4 GHz33662017Komodo 11.01 MP x6416GB 1800X 3.6 GHz34062018Stockfish 9 MP x6416GB 1800X 3.6 GHz35022019Stockfish 10 MP x6416GB 1800X 3.6 GHz35292020Stockfish 12 NNUE MP x6416GB 1800X 3.6 GHz35732021Stockfish 13 MP x6416GB 1800X 3.6 GHz35782022 1 Lc0 0.26.3 Cuda(67362) 3060Ti 35812023 1 Lc0 0.26.3 Cuda(67362) 3060Ti 3586
See also Chess engine rating lists Chess Engines Grand Tournament (CEGT)
Notes
References Swedish Chess Computer Association PLY/SSDF – the story Rating of Best PC Chess Program Chess Computer Museum (M.E.C.A Museo Español Computadoras Ajedrez)