Nalwald

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Nalwald logo [1] Nalwald,

an UCI compatible open source chess engine by Jost Triller, written in the Nim programming language [2], first released in April 2021 [3]. Nalwald is a bitboard engine and generates sliding piece attacks Kindergarten like, by looking up four pre-calculated line attack arrays, 32-Kbyte each, indexed by square and inner six bit line occupancy [4].

Board Representation

• Bitboards
• Kindergarten Bitboards

Search

• Iterative Deepening
• Lazy SMP (Nalwald 15)
• Principal Variation Search
• Transposition Table
• Move Ordering
  • Hash Move
  • Static Exchange Evaluation
  • Killer Heuristic
  • History Heuristic
  • Countermove Heuristic (Nalwald 14)
• Selectivity
  • Null Move Reductions
  • Late Move Reductions
  • Late Move Pruning (Nalwald 15)
  • Check Extensions
  • Futility Pruning
  • Quiescence Search
  • Delta Pruning

Evaluation

• Tapered Eval
• King Square contextual Piece-Square Tables
• Mobility
  • Rook on Open File
• Pawn Structure
  • Isolated Pawn
  • Trio Pawn
  • Passed Pawns
• King Safety
  • Pawn Shelter
  • Attacking King Zone
• Evaluation Tuning using Gradient Descent

See also#

• Googleplex Starthinker
• Hactar

Forum Posts#

• Nalwald: Chess engine written in Nim by Jost Triller, Reddit, April 25, 2021
• Re: New engine releases & news 2021 (Nalwald 1.8.1) by Tony Mokonen, CCC, May 08, 2021
• Re: New engine releases & news 2021 (Nalwald 1.9) by Jost Triller, CCC, June 16, 2021
• Re: New engine releases & news 2021 (Nalwald 1.10) by Jost Triller, CCC, July 03, 2021
• Nalwald by Jost Triller, CCC, September 17, 2021
• Re:Nalwald by Jost Triller, CCC, February 08, 2022

External Links#

Chess Engine#

• Tsoj Tsoj / Nalwald · GitLab
• Nalwald in CCRL Blitz

Misc#

• Nalwald | PaxCalradica Wiki | Fandom

References#

1. ↑ Nalwald logo based on logo.png · master · Tsoj Tsoj / Nalwald · GitLab
2. ↑ Nim programming language from Wikipedia
3. ↑ Nalwald: Chess engine written in Nim by Jost Triller, Reddit, April 25, 2021
4. ↑ bitboard.nim · master · Tsoj Tsoj / Nalwald · GitLab
5. ↑ README.md · master · Tsoj Tsoj / Nalwald · GitLab

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