SSDF

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The SSDF - Svenska schackdatorföreningen, the Swedish Chess Computer Association, is an organization that tests computer chess software by playing chess programs against one another and producing a rating list. The forerunner of the SSDF was founded in 1979 by Johan Enroth in conjunction with the publication of the PLY Magazine . Enroth served as first president and was also Vice-President of the ICCA in the 80s. Initiated by Göran Grottling, the SSDF was founded with the purpose to coordinate the interest for computerchess and chesscomputers in Sweden, and to release PLY. Thoralf Karlsson became chairman until 2013 when he was superseded by Lars Sandin. In 1998, the PLY Magazine was ceased.

Board of the SSDF

2009

• Thoralf Karlsson - Chairman
• Gunnar Blomstrand - Treasurer
• Bo Sjögren - Webmaster

2015

• Lars Sandin - Chairman, responsible for the rating list
• Gunnar Blomstrand - Treasurer
• Bo Sjögren - Webmaster
• Tony Hedlund administrated the database of test games.

Stockholm Micro Computer Chess Tournaments

organized by the Swedish ICCA, forerunner of the SSDF

• First Stockholm Micro Computer Chess Tournament 1979
• Second Stockholm Micro Computer Chess Tournament 1980
• Third Stockholm Micro Computer Chess Tournament 1981

Rating Calibration

In the beginning a lot of calibrations were done to match human ratings  :

Year	Calibration
1985	To the next list the level is lowered with 49 points
	The level is lowered with 23 points more
1986	Once again the level is lowered, this time with 17-22 points
1987	The lists level is lowered with about 3 points
1988	The ratinglist is lowered with about 18 points
1989	The level on the ratinglist gets a huge lowering with about 70 points
2000	Computers ratings lowered by 100 points again because the top is too high compare to humans

See also

• Engine Rating Lists
• PLY Magazine
• Tony's Computer Chess Newsletter by Tony Hedlund

Ratings

• Leaders year by year from Wikipedia
• Lists and comments from 1996 to 2000 by Vincent Lejeune

1994 ...

• SSDF Computer Rating List 4/94 by Mads Brevik, rgc, June 08, 1994
• SSDF COMPUTER RATING LIST 7/94 by Mads Brevik, rgc, October 31, 1994
• The SSDF Rating List 6/95 by Göran Grottling, rgcc, September 08, 1995
• The Swedish Ratinglist 1/96 (1/2) by Göran Grottling, rgcc, January 07, 1996
• The Swedish Ratinglist 1/96 (2/2) by Göran Grottling, rgcc, January 07, 1996
• The Swedish Ratinglist - Long version! by Göran Grottling, rgcc, January 07, 1996
• New SSDF rating list by Andreas Mader, rgcc, April 28, 1997
• SSDF list 9/98 by Enrique Irazoqui, CCC, September 14, 1998

2000 ...

• SSDF Rating List 2000-08-04 by Enrique Irazoqui, CCC, August 4, 2000 (ratings lowered by 100 points)
• SSDF Rating List 2001-06-11 by Thoralf Karlsson, CCC, June 12, 2001
• SSDF Rating List 2001-10-02 by Thoralf Karlsson, CCC, October 02, 2001
• SSDF Rating List 2002-02-15 by Thoralf Karlsson, CCC, February 16, 2002
• SSDF Rating List 2003-01-16 by Thoralf Karlsson, CCC, January 16, 2003
• SSDF Rating List 2003-02-13 by Thoralf Karlsson, CCC, February 14, 2003
• SSDF Rating List 2004-02-25 by Thoralf Karlsson, CCC, February 25, 2004
• SSDF Rating List 2004-12-31 by Thoralf Karlsson, CCC, December 31, 2004

2005 ...

• SSDF Rating List 2005-02-25 by Thoralf Karlsson, CCC, February 26, 2005
• SSDF Rating List 2006-02-10 by Thoralf Karlsson, CCC, February 10, 2006
• SSDF Rating List 2006-11-24 archived by anacadigital.com
• SSDF Rating List 2007-04-21 by Thoralf Karlsson, CCC, April 21, 2007
• SSDF Rating List 2007-11-03 by Thoralf Karlsson, CCC, November 03, 2007
• SSDF Rating List 2008-09-26 by Thoralf Karlsson, CCC, September 26, 2008
• SSDF Rating List 2008-09-26 by Tony Hedlund, Hiarcs Forum, October 09, 2008
• SSDF Rating List 2009-01-16 by Thoralf Karlsson, CCC, January 16, 2009
• SSDF Rating List 2009-04-10 by Thoralf Karlsson, CCC, April 10, 2009
• SSDF Rating List 2009-09-20 by Thoralf Karlsson, CCC, September 21, 2009

2010 ...

• SSDF Rating List 2010-03-21 by Thoralf Karlsson, CCC, March 21, 2010
• SSDF Rating List 2010-09-09 by Thoralf Karlsson, CCC, September 09, 2010
• SSDF Rating List 2011-05-11 by Thoralf Karlsson, CCC, May 12, 2011
• SSDF Rating List 2012-06-28 by Thoralf Karlsson, CCC, June 28, 2012
• SSDF Rating List 2013-03-23 by Lars Sandin, CCC, March 30, 2013
• SSDF Rating List 2013-11-11 by Lars Sandin, CCC, November 13, 2013
• SSDF Rating List 2014-05-12 by Lars Sandin, CCC, May 16, 2014
• SSDF Rating List 2014-12-11 by Lars Sandin, CCC, December 11, 2014

2015 ...

• SSDF Rating List 2015-03-26 by Lars Sandin, CCC, March 26, 2015
• THE SSDF RATING LIST 2015-08-13 by Lars Sandin, CCC, August 13, 2015
• THE SSDF RATING LIST 2016-02-10 by Lars Sandin, CCC, February 10, 2016
• THE SSDF RATING LIST 2016-08-13 by Lars Sandin, CCC, August 13, 2016
• THE SSDF RATING LIST 2017-02-15 by Lars Sandin, CCC, February 15, 2017
• THE SSDF RATING LIST 2017-07-27 by Lars Sandin, CCC, July 27, 2017
• THE SSDF RATING LIST 2018-01-20 by Lars Sandin, CCC, January 20, 2018
• THE SSDF RATING LIST 2018-05-14 by Lars Sandin, CCC, May 14, 2018
• THE SSDF RATING LIST 2018-10-16 by Lars Sandin, CCC, October 16, 2018
• THE SSDF RATING LIST 2019-02-28 by Lars Sandin, CCC, February 28, 2019
• THE SSDF RATING LIST 2019-07-08 by Lars Sandin, CCC, July 08, 2019
• THE SSDF RATING LIST 2019-12-10 by Lars Sandin, CCC, December 10, 2019

2020 ...

• THE SSDF RATING LIST 2020-07-11 by Lars Sandin, CCC, July 11, 2020, dedicated in honor of the late Tony Hedlund
• THE SSDF RATING LIST 2020-12-31 by Lars Sandin, CCC, January 03, 2021
• THE SSDF RATING LIST 2021-07-28 by Lars Sandin, CCC, July 28, 2021
• THE SSDF RATING LIST 2022-01-06 - In memory of Guy Haworth by Lars Sandin, CCC, January 07, 2022, dedicated in honor of Guy Haworth

Forum Posts

• The SSDF FAQ by Göran Grottling, rgcc, July 23, 1995
• Fritz 4 and the SSDF by Moritz Berger, rgcc, June 27, 1996 » Fritz
• Why no Virtual Chess included in SSDF? by Saran Maitreiwech, rgcc, January 01, 1997 » Virtual Chess
• Open letter to the SSDF by Ossi Weiner, CCC, March 10, 1998
• Proposal: New testing methods for SSDF (1) by Jeroen Noomen, CCC, April 13, 1998
• Shredder in the SSDF list by Stefan Meyer-Kahlen, CCC, April 10, 2000 » Shredder
• In case you missed it: SSDF, shiny new hardware... by Dann Corbit, CCC, July 28, 2017

External Links

• Svenska schackdatorföreningen (SSDF)
• The SSDF Rating List
• SSDF Game database
• Swedish Chess Computer Association from Wikipedia

SSDF Leaders year by year

• PLY/SSDF – the story (Wayback Machine, July 2018)
• SSDF Chess Rating FAQ from ChessUSA
• The Mecca of Chess Programs by Claudio Bollini, hosted by Ed Schröder
• Fritz comes second, just behind Deep Fritz - SSDF Rating List, ChessBase News, January 17, 2003
• Dedicated Chess Computers - SSDF list (1992) from Schachcomputer.info Wiki

References

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