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'''TCEC Season 20''',<br/>
the Top Chess Engine Championship (TCEC) Season 20 from December 01, 2020until February 01, 2021. [[Stockfish|Stockfish 20210113]] defended its TCEC title! In total Stockfish won 14 and lost 8 games, 4 game pairs with both White wins, 10 game pairs in favour to Stockfish - four game pairs won by [[Leela Chess Zero|Leela]].
{| class="wikitable" style="margin: auto;"
! [[#Superfinal|Superfinal]] :
| [[Stockfish|Stockfish 20210113]]
| -
|[[Leela Chess Zero|LCZero 0.27.0d-Tilps-dje-magic_JH.94-100]]!53-47
|}
=Participants=
|
|
| style="text-align:center;" | 4
|
|-
|
| style="text-align:center;" | 2
| style="text-align:center;" | 8
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|
|
|
| style="text-align:center;" | 1| style="text-align:center;" | 7
|
|-
|-
| [[Igel]]
! UA<br/>US | [[Volodymyr Shcherbyna]]<br/>[[NNUE]] trained by [[Dietrich KappeVolodymyr Shcherbyna]]| (IGN-0)
|
|
|
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| style="text-align:center;" | 3
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|
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|-
| [[Dragon by KomodoChess|KomodoDragon]]
! US
| [[Don Dailey]], [[Larry Kaufman]], [[Mark Lefler]], et al.
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|
|
|
|style="text-align:center;" | 3
|
|-
| [[Leela Chess Zero|LCZero]]
! BE/CA/<br/>CH/IN/<br/>AU++| [[Gian-Carlo Pascutto]], [[Gary Linscott]],<br/>[[Alexander Lyashuk]], [[Ankan Banerjee]],<br/>[[Gareth Pearce]] et al.
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|
|
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| style="text-align:center;" | 1| style="text-align:center;" | 2
|-
| [[Marvin]]
| style="text-align:center;" | 1
| style="text-align:center;" | 1
| style="text-align:center;" | 7
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|
|
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| style="text-align:center;" | 2| style="text-align:center;" | 8
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|-
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| style="text-align:center;" | 5
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| style="text-align:center;" | 6
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|-
|
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| style="text-align:center;" | 4
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|
|
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| style="text-align:center;" | 2| style="text-align:center;" | '''1'''
|-
| [[Stoofvlees|Stoofvlees II]]
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|
| style="text-align:center;" | 5
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|-
|
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| style="text-align:center;" | 6
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|
==League 1==
'''[[TCEC Season 19#First|< Prev]] [[TCEC Season 21#First|Next >]]'''<br/>
League 1, December 17 - December 25, 2020, timecontrol 45' + 5<nowiki>''</nowiki> <ref>[https://www.tcec-chess.com/archive.html?season=20&div=l1&game=1 S20 - League 1 | TCEC - Computer Chess Broadcast]</ref>.* {| class="wikitable"! # ! Engine ! Et! ro ! Ig! Sl ! Ru! Xi! Ne ! De ! P<span style="font-size: 80%; vertical-align: sub;">28</span>|- style="background-color:#ccffcc;"! 1 | [[Ethereal|Ethereal TCEC-S20]]* | style="text-align:center;" | '''x'''| style="text-align:center;" | 1 ½ 1 ½| style="text-align:center;" | 0 ½ 0 ½| style="text-align:center;" | 1 ½ 1 ½| style="text-align:center;" | 0 1 ½ ½| style="text-align:center;" | ½ ½ ½ 1| style="text-align:center;" | 1 0 1 ½| style="text-align:center;" | 1 ½ 1 1! 17½|- style="background-color:#ccffcc;"! 2 | [[Slow ChessRofChade|SlowChessrofChade 2.308]]* | style="text-align:center;" | 0 ½ 0 ½| style="text-align:center;" | '''x'''| style="text-align:center;" | ½ 1 0 ½| style="text-align:center;" | 1 0 1 0| style="text-align:center;" | 1 0 1 0| style="text-align:center;" | 0 1 ½ 1| style="text-align:center;" | ½ 1 1 ½| style="text-align:center;" | 1 ½ 1 ½! 15½|-! 3 | [[XiphosIgel|Igel 2.9-dev-2_ign-0-04e9eb29]]* | style="text-align:center;" | 1 ½ 1 ½| style="text-align:center;" | ½ 0 1 ½| style="text-align:center;" | '''x'''| style="text-align:center;" | 0 1 ½ ½| style="text-align:center;" | ½ 1 0 1| style="text-align:center;" | 0 ½ 0 ½| style="text-align:center;" | 1 0 ½ ½| style="text-align:center;" | ½ 1 ½ 1! 15½|-! 4 | [[RubiChessSlow Chess|SlowChess Blitz 2.41 avx]]* | style="text-align:center;" | 0 ½ 0 ½| style="text-align:center;" | 0 1 0 1| style="text-align:center;" | 1 0 ½ ½| style="text-align:center;" | '''x'''| style="text-align:center;" | 0 ½ ½ 1| style="text-align:center;" | ½ 1 ½ 1| style="text-align:center;" | ½ ½ ½ 0| style="text-align:center;" | 1 0 1 ½! 14|-! 5 | [[RofChadeRubiChess|rofChadeRubiChess 1.9_803c91ad5c]]* | style="text-align:center;" | 1 0 ½ ½| style="text-align:center;" | 0 1 0 1| style="text-align:center;" | ½ 0 1 0| style="text-align:center;" | 1 ½ ½ 0| style="text-align:center;" | '''x'''| style="text-align:center;" | 1 0 1 ½| style="text-align:center;" | 0 ½ ½ ½| style="text-align:center;" | ½ 1 0 1! 14|-! 6 | [[IgelXiphos|Xiphos 0.6.1]]* | style="text-align:center;" | ½ ½ ½ 0| style="text-align:center;" | 1 0 ½ 0| style="text-align:center;" | 1 ½ 1 ½| style="text-align:center;" | ½ 0 ½ 0| style="text-align:center;" | 0 1 0 ½| style="text-align:center;" | '''x'''| style="text-align:center;" | ½ ½ 1 1| style="text-align:center;" | ½ ½ ½ 1! 14|- style="background-color:#ffcccc;"! 7 | [[Nemorino|Nemorino 6.04_NNUE]]* | style="text-align:center;" | 0 1 0 ½| style="text-align:center;" | ½ 0 0 ½| style="text-align:center;" | 0 1 ½ ½| style="text-align:center;" | ½ ½ ½ 1| style="text-align:center;" | 1 ½ ½ ½| style="text-align:center;" | ½ ½ 0 0| style="text-align:center;" | '''x'''| style="text-align:center;" | 1 0 1 ½! 13|- style="background-color:#ffcccc;"! 8 | [[Defenchess|Defenchess 2.3_dev2]]| style="text-align:center;" | 0 ½ 0 0| style="text-align:center;" | 0 ½ 0 ½| style="text-align:center;" | ½ 0 ½ 0| style="text-align:center;" | 0 1 0 ½| style="text-align:center;" | ½ 0 1 0| style="text-align:center;" | ½ ½ ½ 0| style="text-align:center;" | 0 1 0 ½ | style="text-align:center;" | '''x'''! 8½|}
<span id="Premier"></span>
==Premier Division==
<span id="Sufi"></span>
=Superfinal=
'''[[TCEC Season 19#Sufi|< Prev]] [[TCEC Season 21#Sufi|Next >]]'''<br/>
January 16, 2020 - February 01, 2021, timecontrol 120'+10"<br/>
{| class="wikitable"
! #
! Engine
! W
! D
! L
! P<span style="font-size: 80%; vertical-align: sub;">100</span>
|-
! 1
| [[Stockfish|Stockfish 20210113]]
| style="text-align:right;" | 14
| style="text-align:right;" | 78
| style="text-align:right;" | 8
! 53
|-
! 2
| [[Leela Chess Zero|LCZero 0.27.0d-Tilps-dje-magic_JH.94-100]]
| style="text-align:right;" | 8
| style="text-align:right;" | 78
| style="text-align:right;" | 14
! 47
|}
=Publications=
* [[Guy Haworth]], [[Nelson Hernandez]] ('''2021'''). ''The 20th Top Chess Engine Championship, TCEC20''. [[ICGA Journal#43_1|ICGA Journal, Vol. 43, No. 1]], [https://tcec-chess.com/articles/TCEC_20.pdf pdf]
* [[Matthew Sadler]] ('''2021'''). ''The TCEC20 Computer Chess Superfinal: a Perspective''. [[ICGA Journal#43_1|ICGA Journal, Vol. 43, No. 1]], [https://tcec-chess.com/articles/Sufi_20_-_Sadler.pdf pdf]
=Forum Posts=
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76103 Nemorino is surprising everybody in League 1] by Chessqueen, [[CCC]], December 19, 2020 » [[Nemorino]], [[NNUE]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=76120 A Thank You, to TCEC] by [[Andrew Grant]], [[CCC]], December 21, 2020
* [https://groups.google.com/d/msg/lczero/Uf10cZWOeeY/y3gn8BaCAAAJ TCEC season 20] by [[Warren D. Smith]], [[Computer Chess Forums|LCZero Forum]], January 14, 2021
=External Links=