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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 initially announced his withdrawal from Ethereal's development with his final the 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 .However, Andrew Grant voted for another direction, and announced a commercial release of Ethereal '''13.00''' (NNUE) ,the author's free standard version still available on [https://en.wikipedia.org/wiki/Frustration frustrationGitHub Github] <ref name="Ethereal13NNUE">[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77438 Commercial Release of Ethereal 13.00 (NNUE) for AVX2 Systems] by [[Andrew Grant]], [[CCC]], June 04, 2021</ref>. =Ethereal 13 (NNUE)='''Ethereal 13 (NNUE)''', the commercial Ethereal version for [[AVX2]] systems was released on June 04, 2021. The program comes with two [[NNUE|NNUEs]] for [[Evaluation|evaluation]], one for standard chess, and the secondary network trained exclusively for [[Chess960]]. The NNUEs are not derived from, trained on, nor duplicated from the works of the [[Stockfish]] team <ref name="Ethereal13NNUE"/>.
=Features=
** [[Piece-Square Tables]]
==[[Evaluation]]==
* [[NNUE]] (Ethereal 1213.75 SF-00 NNUE)
* [[Tapered Eval]]
* [[Material]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=75350 Ethereal Tuning - Data Dump] by [[Andrew Grant]], [[CCC]], October 10, 2020
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76049 Ethereal questions] by [[Gabor Szots]], [[CCC]], December 12, 2020
'''2021'''
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77438 Commercial Release of Ethereal 13.00 (NNUE) for AVX2 Systems] by [[Andrew Grant]], [[CCC]], June 04, 2021
=External Links=
==Chess Engine==
* [http://chess.grantnet.us/Ethereal/ Ethereal 13.00 (NNUE)]
* [https://github.com/AndyGrant/Ethereal GitHub - AndyGrant/Ethereal: Ethereal UCI Chess Engine]
* [http://www.computerchess.org.uk/ccrl/404/cgi/compare_engines.cgi?family=Ethereal&print=Rating+list&print=Results+table&print=LOS+table&print=Ponder+hit+table&print=Eval+difference+table&print=Comopp+gamenum+table&print=Overlap+table&print=Score+with+common+opponents Ethereal] in [[CCRL|CCRL 40/4]]
* [http://www.chessdom.com/ethereal-chess-engine-leads-tcec-div-3-convincingly/ Ethereal chess engine leads TCEC Div 3 convincingly], [[Chessdom]], August 12, 2018 » [[TCEC Season 13]]
* [http://www.chessdom.com/ethereal-chess-engine-wins-the-gold-at-tcec-div-3/ Ethereal chess engine wins the gold at TCEC Div 3], [[Chessdom]], August 17, 2018
==Misc==
* [https://en.wiktionary.org/wiki/ethereal ethereal - Wiktionary]
* [https://www.truth-is-beauty.com/blog/style-identities-the-ethereal The Ethereal] from [https://www.truth-is-beauty.com/home.html Truth is Beauty], July 07, 2015
* [[:Category:Jean-Luc Ponty|Jean-Luc Ponty]] - [https://en.wikipedia.org/wiki/Cosmic_Messenger Ethereal Mood] (1978), [https://en.wikipedia.org/wiki/YouTube YouTube] Video
: {{#evu:https://www.youtube.com/watch?v=JwibRL7Eqq4Va5_Y4QS3Eo|alignment=left|valignment=top}}
=References=
[[Category:Linux]]
[[Category:Windows]]
[[Category:Chess960]]
[[Category:OpenBench]]
[[Category:Commercial]]
[[Category:NNUE]]
[[Category:Jean-Luc Ponty]]
[[Category:Astronomy]]
