Ed Schroder

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Ed Schröder, WCCC Madrid 1992 [1]

Ed Schröder, (Ed Schroder)
a Dutch computer chess programmer and founder of Schröder BV [2], a chess software developing company. Ed is author of various chess programs for PCs as well for dedicated chess computers. His most famous chess programs were the commercial programs Rebel [3], and based on Rebel the WMCCC 1991 Micro Champion Gideon [4], the World Computer Chess Champion from the WCCC 1992, ChessMachine [5], and the free program ProDeo [6] [7]. Ed contributed a lot to computer chess, since he made almost all his knowledge about chess programming public, when he retired from competition in 2003 [8]. In 2002 Lokasoft took over the activities of Schröder BV [9].

2011 Rybka Controversy

In 2011, Ed Schröder first signed the open letter directed to the ICGA, to support the claim Rybka 1.0 beta and subsequent versions were allegedly derivatives from Fabien Letouzey’s program Fruit 2.1, but soon after the ICGA decision, reconsidered [10] [11], apologized to Vasik Rajlich [12] and criticized the investigation process and the represented evidence. In November 2011, Ed Schröder announced his new web-sites [13] [14] that give an alternative view of the historic ICGA - RYBKA event that led to the ban of Rybka.

Programs and Computers

Selected Publications

Forum Posts

1993 ...

1995 ...

2000 ...

2005 ...

2010 ...

2015 ...

2020 ...

External Links

Rebel Pure Nostalgica
ideas [16] » ProDeo
Programmer corner [17]


  1. Ed Schröder just won the Shannon Trophy, WCCC Madrid 1992, Computerschaak pagina 1 (Dutch) Redactie: J. ten Have and Drs. S. Kooi
  2. Schröder BV
  3. Computer Chess - Rebel
  4. Mephisto Gideon's ICGA Tournaments
  5. World Champion (1991-1995)
  6. Pro Deo (version 1.2)
  7. ProDeo 1.7 official now by Ed Schröder, CCC, November 02, 2011
  8. Quote from Ed from his former Programmer Stuff site, now summarized in Ed Schröder (2004). How Rebel Plays Chess. pdf:
    On this page I will try to explain some of the secrets of REBEL, I have retired from the competition so I see no need any longer to hide my ideas on computer chess. It's my hope that some of my fellow programmers find something useful on this page and that it might contribute to increase the elo rating of their chess engine.
  9. Company Information, by Ed Schröder and Lex Loep, September 1, 2002
  10. Progess (often) is ugly, a summary try by Rebel, OpenChess Forum, July 03, 2011
  11. In retrospect by Rebel, Rybka Forum, July 14, 2011
  12. Apology to Vas by Rebel, Rybka Forum, August 17, 2011
  13. Rybka vs ICGA a different view by Ed Schröder, November 2011
  14. Rybka evidence by Ed Schröder, November 2011
  15. Stockfish's tuning method by Joona Kiiski, CCC, October 07, 2011
  16. Ideas by Ed Schröder, CCC, September 08, 2016
  17. Blog by Ed Schroder, CCC, November 16, 2017

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