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=Acknowledgements= | =Acknowledgements= | ||
Thanks from the author to following [[People|people]] or [[Organizations|organizations]] <ref>[https://github.com/mAarnos/Hakkapeliitta mAarnos/Hakkapeliitta · GitHub - Acknowledgements]</ref> | Thanks from the author to following [[People|people]] or [[Organizations|organizations]] <ref>[https://github.com/mAarnos/Hakkapeliitta mAarnos/Hakkapeliitta · GitHub - Acknowledgements]</ref> | ||
| − | * [[Main Page| | + | * [[Main Page|CPW]] (Thanks as well) |
* [[CCC|Talkchess]] | * [[CCC|Talkchess]] | ||
* [[Tord Romstad]] of [[Glaurung]] | * [[Tord Romstad]] of [[Glaurung]] | ||
Revision as of 22:35, 9 November 2018
Home * Engines * Hakkapeliitta
Hakkapeliitta,
an UCI compatible open source chess engine by Mikko Aarnos, written in C++11/14 and licensed under the GNU General Public License, Version 3. Hakkapeliitta is a state of the art bitboard engine, and performs Magic bitboards to determine sliding piece attacks. Despite using conditional compiled x86-64 processer instructions for bitscan, Hakkapeliitta uses Kim Walisch's forward and reverse bitscans [2]. If the processor does not support hardware popcount, Hakkapeliitta falls back to SWAR-popcount. The search uses function templates to distinguish between PV-nodes and none PV-nodes at compile time [3]. Similar, hardware popcount support is boolean template parameter of evaluation routines [4].
Contents
Etymology
The term is probably based on the Finnish battle cry "Hakkaa päälle" [5], commonly translated as "Cut them down!". The Finnish cavalryman in the service of King Gustavus Adolphus of Sweden during the Thirty Years' War (1618 to 1648) were called Hackapelit, Hackapelite, Hackapell, Haccapelit, or Haccapelite in the Holy Roman Empire, in the 19th-century modified to Finnish Hakkapeliitta [6] [7].
Features
Search
- Iterative Deepening
- Aspiration Windows
- Principal Variation Search
- Transposition Table
- Zobrist Hashing
- Null Move Pruning
- Late Move Reductions
- Internal Iterative Deepening
- Futility Pruning
- Move Count Based Pruning
- Reverse Futility Pruning
- Razoring
- Killer Heuristic
- Relative History Heuristic
- Static Exchange Evaluation
Evaluation
Misc
- Magic Bitboards
- Perft
- Pondering (since 3.0)
- Syzygy Bases
Acknowledgements
Thanks from the author to following people or organizations [9]
- CPW (Thanks as well)
- Talkchess
- Tord Romstad of Glaurung
- Ronald de Man
- Tord Romstad, Marco Costalba, and Joona Kiiski of Stockfish
- Robert Hyatt of Crafty
- Peter Österlund of Texel
- Authors of Ivanhoe
- Ed Schröder of Rebel and Pro Deo [10]
- Stef Luijten of Winglet [11]
- Steve Maughan of Maverick
- Tom Kerrigan of TSCP
Forum Posts
2014
- Hakkapeliitta dev 63.7 by Mikko Aarnos by Jose Mº Velasco, CCC, February 25, 2014
- Hakkapeliitta 1.0 release by Mikko Aarnos, CCC, June 22, 2014
- Hakkapeliitta 2.0 release by Mikko Aarnos, CCC, December 25, 2014
2015 ...
- Hakkapeliitta 3.0 release by Mikko Aarnos, CCC, June 27, 2015
- Hakkapeliitta the "STRONGEST" in tactic, new Nr1 by Frank Quisinsky, CCC, July 19, 2015
- Hakkapeliitta TCEC, dev relase by velmarin, CCC, April 21, 2016
External Links
Chess Engine
Misc
- Hakkapeliitta - Wiktionary
- Hakkapeliitta from Wikipedia
- Hakkapeliittain Marssi from Wikipedia
- Hakkapeliitta (lehti) Wikipedia (Finnish, Paramilitary Journal 1926 - 1944)
- Mossy Rocks - Cut Em Down, YouTube Video
References
- ↑ Hakkapeliitta featured on a 1940 Finnish stamp, Wikimedia Commons
- ↑ Hakkapeliitta/bitboard.hpp at master · mAarnos/Hakkapeliitta · GitHub
- ↑ Hakkapeliitta/search.cpp at master · mAarnos/Hakkapeliitta · GitHub - template <bool pvNode> int Search::search
- ↑ Hakkapeliitta/evaluation.cpp at master · mAarnos/Hakkapeliitta · GitHub
- ↑ Hakkapeliitta - Wiktionary
- ↑ Hakkapeliitta from Wikipedia
- ↑ Military of the Swedish Empire - Wikipedia
- ↑ based on sources of Hakkapeliitta 2.0
- ↑ mAarnos/Hakkapeliitta · GitHub - Acknowledgements
- ↑ Inside Rebel/Prodeo by Ed Schröder
- ↑ Winglet, Writing a Chess Program in 99 Steps by Stef Luijten, Wayback Machine
