Stash

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The Omphalos stone ¹

Stash, (Stash-bot)
an UCI compliant open source chess engine by Morgan Houppin, written in C, licensed under the GPL v3 and first released on GitLab in February 2020 ¹.

Features

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Board Representation

• Bitboards
• Magic Bitboards
• PEXT Bitboards

Search

• Iterative Deepening
• Aspiration Windows
• Lazy SMP
• Principal Variation Search
• Transposition Table
  • Shared Hash Table
  • Zobrist Hashing
• Move Ordering
  • Hash Move
  • Promotions
  • MVV/LVA
  • Killer Heuristic
  • History Heuristic
• Selectivity
  • Razoring
  • Futility Pruning
  • Null Move Pruning
  • Zugzwang Verification
  • Late Move Reductions
  • Late Move Pruning (v23.0)
  • Mate Distance Pruning
  • Quiescence Search

Evaluation

• Tapered Eval
• Material
  • Bishop Pair
  • Draw Evaluation
• Mobility
  • Rooks on (Semi) Open Files
• Pawn Structure
  • Pawn Hash Table
  • Backward Pawn
  • Doubled Pawn
  • Isolated Pawn
  • Passed Pawn
• King Safety
  • Attacking King Zone
  • Castling Rights

Forum Posts

• New engine: Stash by Morgan Houppin, CCC, February 14, 2020
• Re: Linux friendly engines at all levels by Morgan Houppin, CCC, October 11, 2020
• INTERESTING Engines with Unique Styles (Unlike SF) by Brendan J. Norman, CCC, October 11, 2020
• Re: Stash has lost 2 game because of NO EGTB by Morgan Houppin, CCC, March 25, 2021
• Re: New engine releases & news 2021 (Stash 30.0, Bagatur 2.2b) by Günther Simon, CCC, May 01, 2021
• Re: New engine: Stash (Stash 31.0) by Morgan Houppin, CCC, June 28, 2021

External Links

Chess Engine

• Morgan Houppin / stash-bot · GitLab
• GitHub - mhouppin/stash-bot: Mirror of my Gitlab chess engine project
• Stash in CCRL Blitz

Misc

• stash - Wiktionary
• Stash from Wikipedia
• Phish - Stash, Merriweather Post Pavilion in Columbia, MD, July 14, 2013, YouTube Video

Watch on YouTube

References