REBEL (chess)

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.[4][5]
REBEL
Original author(s)Ed Schröder
Initial release1980
Stable release
16.3 / March 11, 2024 (2024-03-11)[1][2][3]
TypeChess engine
LicenseGNU General Public License v3.0 (14 and after)
proprietary commercial software (13 and before)
Websiterebel13.nl
This article is part of the series on
Chess programming
Board representations
  • 0x88
  • Bitboards
Evaluation functions
  • Deep neural networks (Transformers)
  • Attention
  • Efficiently updatable neural networks
  • Handcrafted evaluation functions
  • Piece-square tables
  • Reinforcement learning
  • Stochastic gradient descent
  • Supervised learning
  • Texel tuning
  • Unsupervised learning
Graph and tree search algorithms
Chess computers
Chess engines

See also

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.
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