Sayuri

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Sayuri Logo [1] Sayuri,

an UCI compliant open source chess engine under the MIT License, written by Hironori Ishibashi in C++11, first published in 2013 [2]. Sayuri has an embedded LISP interpreter dubbed Sayulisp, which can generate and operate the chess engine, and customize search algorithms and evaluation weights [3].

Board Representation

Sayuri is a bitboard engine and determines sliding piece attacks using rotated bitboards indexed by square , 8-bit line occupancy and {0,45,90,135}-rotation - no outer square optimization for 4-fold denser tables applied.

Search

• Iterative Deepening
• Aspiration Windows
• Principal Variation Search
• Parallel Search
  • Shared Hash Table
  • Young Brothers Wait Concept
• Selectivity
  • Check Extensions
  • Futility Pruning
  • History Leaf Pruning
  • Late Move Reductions
  • Null Move Reductions
  • ProbCut
  • Quiescence Search
• Move Ordering
  • Killer Heuristic
  • History Heuristic
  • Internal Iterative Deepening
  • Static Exchange Evaluation

Evaluation

• Evaluation Hash Table
• Material
• Piece-Square Tables
• Mobility
• Pinned Pieces
• Pawn Structure
  • Passed Pawns
  • Defended Pawns
  • Doubled Pawns
  • Isolated Pawns
• Evaluation of Pieces
  • Rooks on (semi) open files
  • Bad Bishop
  • Too Early Queen Development
• King Safety
  • Attacking King Zone
  • Pawn Shield

Forum Posts#

• Sayuri (UCI Engine) by Ishibashi Hironori by Norbert Raimund Leisner, CCC, November 08, 2013
• Sayuri 27th February 2015 Edition by Norbert Raimund Leisner, CCC, February 27, 2015
• Sayuri release two days ago by Norbert Raimund Leisner, CCC, June 27, 2015
• Sayuri 2015.12.08 Released!! by Hironori Ishibashi, Google Groups, December 08, 2015
• Sayuri by Dann Corbit, CCC, December 11, 2015
• Sayuri new releases by Günther Simon, CCC, May 11, 2016
• Sayuri 2017.09.26 release by Norbert Raimund Leisner, CCC, September 27, 2017
• Sayuri 2017.09.29 Released!! by Hironori Ishibashi, Google Groups, September 29, 2017
• Re: Provide a short description? by Hironori Ishibashi, Google Groups, October 04, 2017
• Sayuri 2018.05.23 Released by Hironori Ishibashi, Google Groups, May 23, 2018

External Links#

Chess Engine#

• MetalPhaeton/sayuri · GitHub
• Sayuri - UCI Chess Engine, Google Groups
• Sayuri in CCRL 40/4

Misc#

• Sayuri - Wiktionary
• Sayuri from Wikipedia
• Memoirs of a Geisha - Sayuri’s Theme, Soundtrack (2005) composed and conducted by John Williams, featuring Yo Yo Ma and Itzhak Perlman, YouTube Video

References#

1. ↑ sayuri/sayuri_logo_small.png at master · MetalPhaeton/sayuri · GitHub
2. ↑ Sayuri (UCI Engine) by Ishibashi Hironori by Norbert Raimund Leisner, CCC, November 08, 2013
3. ↑ sayuri/README.md at master · MetalPhaeton/sayuri · GitHub
4. ↑ based on Sayuri 2015.12.08, Sayuri 2015.12.08 Released!! by Hironori Ishibashi, Google Groups, December 08, 2015

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