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RuyDos,
an UCI compliant chess engine by primary author Álvaro Begué along with José Manuel Morán ^[1], written in C++, developed since 2013 ^[2] and first published as open source under the MIT License in June 2017 ^[3].

Etymology

The name is the Spanish procounciation of "Ruy 2", meaning the second program in the Ruy-López saga. It is also a homophone of the Spanish word "ruidos", which means "noises".

Features

Board Representation

• Bitboard Board-Definition ^[4]
• 8x8 Board
• Little-Endian Rank, Big-Endian File Mapping (LERBEF) (h1=0, a1=7, a8=63)
• Fancy Magic Bitboards

Search

• Iterative Deepening ^[5]
• Principal Variation Search
• Transposition Table
• Selectivity
  Null Move Pruning
  Late Move Reductions
  Check Extensions
  Recapture Extensions
• Quiescence Search
  Delta Pruning
  SEE > 0
• Move Ordering
  MVV/LVA
  Killer Heuristic
  History Heuristic

Evaluation

• Material ^[6]
  Material Hash Table
  Tapered Eval
  Bishop Pair
• Square Control
• Outposts
• Pawn Structure
  Backward Pawn
  Doubled Pawn
  Isolated Pawn
• Passed Pawn
• King Safety
• Mobility
• Tuned with RuyTune

Misc

• Syzygy Bases via Fathom

See also

• Ruy Lopez

Forum Posts

2013

• Suggestions for a sparring partner by Álvaro Begué, CCC, February 19, 2013

2017

• RuyDos publicly available by Álvaro Begué, CCC, June 01, 2017
• RuyDos publicly available by Álvaro Begué, CCC (General Topics), June 01, 2017
• Testing endgame strength by Álvaro Begué, CCC, June 21, 2017 » Engine Testing
• Fathom memory usage by Álvaro Begué, CCC, June 22, 2017» Syzygy Bases via Fathom
• RuyDos with support for syzygy tablebases by Álvaro Begué, CCC, June 23, 2017 » Syzygy Bases
• RuyDos 1.0.13 UCI release by Norbert Raimund Leisner, CCC, June 25, 2017
• RuyDos 1.0.27 UCI for macOS - includes src by Michael B, CCC, September 03, 2017

2018 ...

• RuyDos 1.1.0 by Álvaro Begué, CCC, February 17, 2018

External Links

• alonamaloh / RuyDos — Bitbucket

References

1. ^ alonamaloh / RuyDos / source / LICENSE — Bitbucket
2. ^ Suggestions for a sparring partner by Álvaro Begué, CCC, February 19, 2013
3. ^ RuyDos publicly available by Álvaro Begué, CCC, June 01, 2017
4. ^ alonamaloh / RuyDos / source / board.h — Bitbucket
5. ^ alonamaloh / RuyDos / source / engine.cpp — Bitbucket
6. ^ alonamaloh / RuyDos / source / engine.cpp — Bitbucket

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