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REBEL is a world champion chess program developed by Ed Schröder. Development of REBEL started in 1980 on a TRS-80, and it was ported many times to dedicated hardware and the fastest microprocessors of the day:

• 1980s – Running on a TRS-80, Apple II, and inside of Mephisto brand dedicated chess computers, it won the Dutch open computer chess championship four times.
• 1991 – Ported to the ARM ChessMachine and named Gideon, it won the World Microcomputer Chess Championship.
• 1992 – Gideon won the World Computer Chess Championship, the first time a microprocessor came ahead of a field of mainframes, supercomputers, and custom chess hardware.
• 1990s – REBEL was ported to MS-DOS and then Microsoft Windows and sold commercially
  • 1997 – REBEL won a match with GM Arthur Yusupov 10.5–6.5, the first successful challenge of a chess grandmaster by a commercial program.
  • 1998 – REBEL won a match with GM Viswanathan Anand 5–3 (but lost 0.5–1.5 in the standard time control section of the match). He was rated number two in the world at the time.
• 2004 – Ed Schröder retired, releasing the last version of REBEL as the freeware chess engine Pro Deo.
• 2022 - On January 12, 2022, Ed Schröder came out of retirement to release REBEL 14 as a free chess engine. It incorporates an efficiently updatable neural network in REBEL's evaluation function, along with a heavily modified version of Fruit's search.

See also

• Fruit (software)

References

1. Ed Schröder (February 17, 2023). "rebel-16". HOME OF THE DUTCH REBEL. Archived from the original on June 22, 2023. Retrieved June 19, 2023.
2. Ed Schröder (February 18, 2023). "Rebel 16.2 release". Prodeo Computer Chess Forum. Retrieved June 19, 2023.
3. Steve Maughan (February 21, 2023). "Rebel 16.2: Impressive!". Computer Chess Club Forum. Retrieved June 19, 2023.
4. Ed Schröder. "REBEL 14". HOME OF THE DUTCH REBEL. Archived from the original on June 22, 2023. Retrieved June 19, 2023.
5. Ed Schröder (January 12, 2022). "Rebel 14". Computer Chess Club Forums. Retrieved June 19, 2022.

External links

• "Ed's recollection of REBEL's history". Archived from the original on 6 November 2020.
• "Wealth of information on the inner workings of a professional program". Archived from the original on 26 April 2011.
• Schröder, Ed. "How REBEL Plays Chess" (PDF). Archived from the original (PDF) on 6 November 2020.
• Rebel (Chess Programming Wiki)

• Chess engines