Loki

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[ Loki with a fishing net [1] Loki,

an UCI compliant open source chess engine by Niels Abildskov, written in C++ 17, first released in February 2021 [2]. The author reports progress on Loki in an own CCC forum thread [3].

Features#

[6] [3]

Board Representation

• Bitboards
• Magic Bitboards

Search

• Lazy SMP
• Iterative Deepening
• Aspiration Windows
• Alpha-Beta ( Fail-Hard)
• Principal Variation Search
• Transposition Table
• Move Ordering
  • PV-Move
  • Internal Iterative Deepening
  • Captures by MVV/LVA
  • Static Exchange Evaluation
  • Killer Heuristic
  • History Heuristic
  • Countermove Heuristic
• Selectivity
  • Mate Distance Pruning
  • Adaptive Null Move Pruning
  • Extended Futility Pruning
  • Reverse Futility Pruning
  • Razoring
  • Late Move Reductions
  • Late Move Pruning
  • Check Extensions
  • Quiescence Search
  • SEE Pruning
  • Delta Pruning

Evaluation

• Tapered Eval
• Material
• Piece-Square Tables
• Safe Mobility
• Pawn Structure
• Passed Pawn
• King Safety

Misc#

• SPSA Texel’s Tuning Method
• Perft

See also#

• Freyr
• Thor’s Hammer

Forum Posts#

• Re: New engine releases & news 2021 (Loki 1.0.2) by Niels Abildskov, CCC, February 21, 2021
• Re: New engine releases & news 2021 (Loki 2.0.0) by Niels Abildskov, CCC, March 11, 2021
• Re: New engine releases & news 2021 (Loki 3.0) by Niels Abildskov, CCC, April 13, 2021
• Progress on Loki by Niels Abildskov, CCC, April 16, 2021
• Tuning search parameters by Niels Abildskov, CCC, April 18, 2021
• Staged move generation done right (Progress on Loki)] by Niels Abildskov, CCC, July 23, 2021

External Links#

Chess Engine#

• GitHub - BimmerBass/Loki - C++17 chess engine
• Loki in CCRL Blitz

Misc#

• Loki - Wiktionary
• Loki from Wikipedia
• Loki (disambiguation) from Wikipedia
• Loki (comics) from Wikipedia
• Loki Entertainment from Wikipedia
• Modern C++ Design - Loki library from Wikipedia
• LOKI from Wikipedia
• Donald Byrd - Loki, Blackjack (1967), YouTube Video

feat.: Sonny Red, Hank Mobley, Cedar Walton, Walter Booker, Billy Higgins

References#

1. ↑ Loki with a fishing net, A Norse mythology image from the 18th century Icelandic manuscript SÁM 66, now in the care of the Árni Magnússon Institute for Icelandic Studies, Loki from Wikipedia, Wikimedia Commons
2. ↑ Re: New engine releases & news 2021 (Loki 1.0.2) by Niels Abildskov, CCC, February 21, 2021
3. ↑ 3.0 3.1 Progress on Loki by Niels Abildskov, CCC, April 16, 2021
4. ↑ BimmerBass/Loki - C++17 chess engine | Why the name?
5. ↑ Loki from Wikipedia
6. ↑ GitHub - BimmerBass/Loki - C++17 chess engine

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