RuyDos

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[ Noise curves [1] RuyDos,

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

Features#

Board Representation

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

Search

• Iterative Deepening
• 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

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
• RuyTune

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 1.0.32 UCI by Norbert Raimund Leisner, CCC, February 06, 2018
• RuyDos 1.1.0 by Álvaro Begué, CCC, February 17, 2018
• RuyDos 1.1.6 by Álvaro Begué, CCC, May 01, 2018
• Re: easy move? by Álvaro Begué, CCC, October 19, 2018 » Time Management

External Links#

Chess Engine#

• alonamaloh / RuyDos — Bitbucket ( Wayback Machine)
• RuyDos at CCRL 40/4
• RuyDos at CCRL 40/40

Misc#

• ruy - Wiktionary
• Ruy - Wiktionary
• Ruy from Wikipedia
• Ruido - Wikipedia.es (Spanish)

References#

1. ↑ Figure showing the noise curves of various gravitational-wave detectors as a function of frequency together with the characteristic strain of a selection of astrophysical sources, Pink noise from Wikipedia
   Christopher Moore, Robert Cole, Christopher Berry (2014). Gravitational-wave sensitivity curves. arXiv:1408.0740
2. ↑ Suggestions for a sparring partner by Álvaro Begué, CCC, February 19, 2013
3. ↑ RuyDos publicly available by Álvaro Begué, CCC, June 01, 2017

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