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'''Ethereal''',<br/>
an [[UCI]] compliant [[:Category:Open Source|open source chess engine]] written by [[Andrew Grant]] in [[C]], licensed under the [[Free Software Foundation#GPL|GNU GPL]] and first officially released in June 2016 <ref>[http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=7&t=8645 Ethereal - Official Release] by [[Andrew Grant]], [[Computer Chess Forums|CCRL Discussion Board]], June 25, 2016</ref>. Ethereal is greatly influenced from [[Crafty]], [[Stockfish]], [[TSCP]], [[MadChess]], and [[Fruit]] <ref>[https://github.com/AndyGrant/Ethereal/blob/master/README.md Ethereal/README.md at master · AndyGrant/Ethereal · GitHub]</ref>.
On October 09, 2020, Andrew Grant announced his withdrawal from Ethereal's development with his final releases of Ethereal '''V12.75'''
<ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75335 Final Release of Ethereal, V12.75] by [[Andrew Grant]], [[CCC]], October 09, 2020</ref>
and Ethereal '''12.75 SF-NNUE''', the latter a [[NNUE]] implementation based on [[Stockfish NNUE]], to deliberately demonstrate how everybody may considerably improve the [[Playing Strength|playing strength]] of their engines without much effort
<ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75335&start=91 Re: Final Release of Ethereal, V12.75] by [[Andrew Grant]], [[CCC]], October 09, 2020</ref> - causing the author's [https://en.wikipedia.org/wiki/Frustration frustration].
=Features=
** [[Razoring]]
** [[Reverse Futility Pruning]] (Static Null Move Pruning)
** [[Static Exchange Evaluation|Static Exchange Evaluation Pruning]]
** [[Multi-Cut]] (12.00)
* [[Move Ordering]]
** [[Internal Iterative Deepening]]
** [[Killer Heuristic]]
** [[History Heuristic]]
** [[Piece-Square Tables]]
==[[Evaluation]]==
* [[NNUE]] (Ethereal 12.75 SF-NNUE)
* [[Tapered Eval]]
* [[Material]]
* [[Pawn Hash Table]]
* [[Pawn Structure]]
* [[Automated Tuning]] by [[Automated Tuning#LogisticRegression|Logistic Regression]], [https://en.wikipedia.org/wiki/Stochastic_gradient_descent#AdaGrad AdaGrad] (12.50) <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74877 Evaluation & Tuning in Chess Engines] by [[Andrew Grant]], [[CCC]], August 24, 2020 </ref><ref>[http://www.talkchess.com/forum3/viewtopic.php?f=7&t=75350 Ethereal Tuning - Data Dump] by [[Andrew Grant]], [[CCC]], October 10, 2020</ref>
==Misc==
* [[Syzygy Bases]] using [[Syzygy Bases#Fathom|Fathom's]] probing code (9.65), superseded by 7-men [[Syzygy Bases#Pyrrhic|Pyrrhic]] (12.50)
=See alsoPublications=* [[Andrew Grant]] ('''2020'''). ''Evaluation & Tuning in Chess Engines''. <ref>[http:Category//www.talkchess.com/forum3/viewtopic.php?f=7&t=74877 Evaluation & Tuning in Chess Engines] by [[Andrew Grant]], [[CCC]], August 24, 2020 </ref> <ref>[http:Astronomy|Astronomy//www.talkchess.com/forum3/viewtopic.php?f=7&t=75350 Ethereal Tuning - Data Dump] by [[Andrew Grant]], [[CCC]], October 10, 2020</ref>
=Forum Posts=
==2016...==
* [http://www.talkchess.com/forum/viewtopic.php?t=60023&start=18 Re: How to speed up my engine] by [[Günther Simon]], [[CCC]], May 03, 2016
: [http://www.talkchess.com/forum/viewtopic.php?t=60023&start=19 Re: How to speed up my engine] by [[Andrew Grant]], [[CCC]], May 03, 2016
* [http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=7&t=8645 Ethereal - Official Release] by [[Andrew Grant]], [[Computer Chess Forums|CCRL Discussion Board]], June 25, 2016
* [http://www.talkchess.com/forum/viewtopic.php?t=61335 Release of Ethereal7.78] by [[Andrew Grant]], [[CCC]], September 04, 2016
* [http://www.talkchess.com/forum/viewtopic.php?t=64162 Official release of Ethereal8.16] by [[Andrew Grant]], [[CCC]], June 03, 2017
* [http://www.talkchess.com/forum/viewtopic.php?t=65165 Ethereal8.28 Release] by [[Andrew Grant]], [[CCC]], September 13, 2017
* [http://www.talkchess.com/forum/viewtopic.php?t=65989 Ethereal 8.61 -- Small bugfix to 8.60] by [[Andrew Grant]], [[CCC]], December 12, 2017
* [http://www.talkchess.com/forum/viewtopic.php?t=66099 Time Managment translating to SMP] by [[Andrew Grant]], [[CCC]], December 23, 2017 » [[Parallel Search]], [[Time Management]]
* [http://www.talkchess.com/forum/viewtopic.php?t=66606 Official Release of Ethereal9.00] by [[Andrew Grant]], [[CCC]], February 15, 2018
* [http://www.talkchess.com/forum/viewtopic.php?t=66882 Official Release of Ethereal9.30] by [[Andrew Grant]], [[CCC]], March 20, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=67993&p=76840 Official Release of Ethereal 10.55] by [[Andrew Grant]], [[CCC]], July 16, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=68293 Ethereal 10.88 NUMA] by [[Norman Schmidt]], [[CCC]], August 24, 2018 » [[NUMA]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=69669 Official Release of Ethereal 11.25] by [[Andrew Grant]], [[CCC]], January 21, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=72215 For those that like to toy with Ethereal...] by [[Dann Corbit]], [[CCC]], October 30, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=72299 Official Release of Ethereal 11.75, supporting MultiPV] by [[Andrew Grant]], [[CCC]], November 11, 2019
==2020 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=73233 Official Release of Ethereal 12.00] by [[Andrew Grant]], [[CCC]], February 29, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=73629 Pawn structure tuning] by [[Vivien Clauzon]], [[CCC]], April 11, 2020 » [[Pawn Structure]], [[Automated Tuning]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74809 Pyrrhic, Fathom for Humanoids] by [[Andrew Grant]], [[CCC]], August 16, 2020 » [[Syzygy Bases#Pyrrhic|Pyrrhic]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=74877 Evaluation & Tuning in Chess Engines] by [[Andrew Grant]], [[CCC]], August 24, 2020 » [[Automated Tuning]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75047 Official Release of Ethereal 12.50] by [[Andrew Grant]], [[CCC]], September 08, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75159 Ethereal Pawn-King NN] by [[Andrew Grant]], [[CCC]], September 19, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75335 Final Release of Ethereal, V12.75] by [[Andrew Grant]], [[CCC]], October 09, 2020
: [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75335&start=91 Re: Final Release of Ethereal, V12.75] by [[Andrew Grant]], [[CCC]], October 09, 2020
: [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75335&start=134 Re: Final Release of Ethereal, V12.75] by [[Andrew Grant]], [[CCC]], November 12, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=75345 Request for someone to train an NNUE for Ethereal] by [[Andrew Grant]], [[CCC]], October 09, 2020 » [[NNUE]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=75350 Ethereal Tuning - Data Dump] by [[Andrew Grant]], [[CCC]], October 10, 2020
=External Links=
[[Category:GPL]]
[[Category:UCI]]
[[Category:PC]]
[[Category:X86]]
[[Category:X64]]
[[Category:Linux]]
[[Category:Windows]]
[[Category:NNUE]]
[[Category:Jean-Luc Ponty]]
[[Category:Astronomy]]
