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'''Halogen''',<br/>
an [[UCI]] compliant [[:Category:Open Source|open source chess engine]] by [[Kieren Pearson]], written in [[Cpp|C++]], licensed under the [[Free Software Foundation#GPL|GPL v3]] and first released on [https://en.wikipedia.org/wiki/GitHub GitHub] in June 2019 <ref>[https://github.com/KierenP/Halogen/releases/tag/v2.3 Release Halogen 2.3 · KierenP/Halogen · GitHub]</ref>.
Since version 7 in Spetmeber September 2020, Halogen features an own, [[Incremental Updates|incrementally updated]] [[NNUENeural Networks|neural network]] for its [[Evaluation Function|evaluation function]], inspired by [[Stockfish NNUE]].
Halogen 8 features a larger network than Halogen 8, but runs significantly faster due to improvements and optimisations, best if compiled for [[AVX2]] instructions.
Its development and testing was supported on the [[OpenBench]] framework. Networks are trained through a private, from scratch [[C]] implementation created in collaboration with [[Andrew Grant]] <ref>[https://github.com/KierenP/Halogen/blob/master/README.md Halogen/README.md at master · KierenP/Halogen · GitHub]</ref>.
** [[Zobrist Hashing]]
* [[Move Ordering]]
** [[Hash Move]]
** [[Static Exchange Evaluation|SEE]] for [[Captures]]
** [[Killer Heuristic]]
** [[Mate Distance Pruning]]
** [[Futility Pruning]]
** [[Late Move Reductions]]
** [[Quiescence Search]]
==[[Evaluation]]==
* [[Evaluation Hash Table]]
* [[NNUE]] (>= Halogen 7)
==Misc==
=Forum Posts=
==2019==
* [http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?t=11671 Requirements for a new chess engine] by [[Kieren Pearson]], [[Computer Chess Forums|CCRL Discussion Board]], December 09, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=69754&start=443 Re: New engine releases 2019] by [[Günther Simon]], [[CCC]], December 22, 2019 » Halogen 2.7.3
==2020 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72613&start=9 Re: New engine releases 2020] by [[Gabor Szots]], [[CCC]], January 06, 2020 » Halogen 3.0
* [http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=7&t=12174 Halogen 4 release] by [[Kieren Pearson]], [[Computer Chess Forums|CCRL Discussion Board]], June 22, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72613&start=264 Re: New engine releases 2020] by [[Kieren Pearson]], [[CCC]], June 22, 2020 » Halogen 4
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72613&start=276 Re: New engine releases 2020] by [[Kieren Pearson]], [[CCC]], July 14, 2020 » Halogen 5
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72613&start=390 Re: New engine releases 2020] by [[Kieren Pearson]], [[CCC]], September 22, 2020 » Halogen 7
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72613&start=457 Re: New engine releases 2020] by [[Kieren Pearson]], [[CCC]], October 27, 2020 » Halogen 8
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75640 Halogen questions] by [[Günther Simon]], [[CCC]], November 01, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72613&start=487 Re: New engine releases 2020] by [[Kieren Pearson]], [[CCC]], November 11, 2020 » Halogen 8.1
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75890&start=6 Re: Speculations about NNUE development (was New engine releases 2020)] by [[Connor McMonigle]], [[CCC]], November 12, 2020 » [[Dragon by Komodo Chess]], [[Seer]]
: [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75890&start=9 Re: Speculations about NNUE development (was New engine releases 2020)] by [[Connor McMonigle]], [[CCC]], November 12, 2020
=External Links=
[[Category:UCI]]
[[Category:PC]]
[[Category:X86]]
[[Category:X64]]
[[Category:Windows]]
[[Category:NNUE]]
[[Category:OpenBench]]
[[Category:Music]]
