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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=
** [[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* [[Syzygy Bases]] using [[Syzygy Bases#Fathom|Fathom's]] probing code (9.65), superseded by 7-men [[Syzygy Bases#Pyrrhic|Pyrrhic]] (12.50)
=Publications=
* [[Andrew Grant]] ('''2020'''). ''Evaluation & Tuning in Chess Engines''. <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>
=Forum Posts=
* [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:Linux]]
[[Category:Windows]]
[[Category:NNUE]]
[[Category:Jean-Luc Ponty]]
[[Category:Astronomy]]
