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'''TCEC Season 21''',<br/>
the Top Chess Engine Championship (TCEC) Season 21 from May 10until August 07, 2021.[[Stockfish|Stockfish 14_202107131735]] won the [[#Superfinal|Superfinal]] versus [[Leela Chess Zero|LCZero 0.28-dev+_69626]]. {| class="wikitable" style="margin: auto;"! [[#Superfinal|Superfinal]] :| [[Stockfish|Stockfish 14_202107131735]]| - | [[Leela Chess Zero|LCZero 0.28-dev+_69626]]! 56-44 |}
=Participants=
! [[#First|1]]
! [[#Premier|P]]
! [[#Superfinalfinals|SufiFinals]]
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| [[Leela Chess Zero|LCZero]]
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| [[Marvin]]
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| [[Stoofvlees]]
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| [[TomitankChess|tomitankChess]]
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'''[[TCEC Season 20#Second|< Prev]] [[TCEC Season 22#Second|Next >]]'''<br/>
Season 21, League 2, June 05 - June 11, 2021, timecontrol 30' + 5<nowiki>''</nowiki>
<ref>[https://tcec-chess.com/#div=l2&game=1&season=21 S21 - League 3 2 | TCEC - Computer Chess Broadcast]</ref>.
{| class="wikitable"
! #
==League 1==
'''[[TCEC Season 20#First|< Prev]] [[TCEC Season 22#First|Next >]]'''<br/>
Season 21, League 1, June 11 - ...June 19, 2021, timecontrol 3045' + 5<nowiki>''</nowiki> <ref>[https://tcec-chess.com/#div=l1&game=1&season=21 S21 - League 1 | TCEC - Computer Chess Broadcast]</ref>{| class="wikitable"! # ! Engine! Ig! Et! Ru! Sl! Pe! Xi! ro! Ne! P<span style="font-size: 80%; vertical-align: sub;">28</span>|- style="background-color:#ccffcc;"! 1 * | [[EtherealIgel|Igel 3.0.5]]* | style="text-align:center;" | '''x'''| style="text-align:center;" | ½ 1 0 ½| style="text-align:center;" | 1 ½ 1 ½| style="text-align:center;" | ½ ½ 1 0| style="text-align:center;" | 1 ½ 1 ½| style="text-align:center;" | ½ 1 ½ 1| style="text-align:center;" | 1 ½ 0 ½| style="text-align:center;" | ½ ½ ½ 1! 17½|- style="background-color:#ccffcc;"! 2 | [[rofChadeEthereal|Ethereal 12.95]]* | style="text-align:center;" | ½ 0 1 ½| style="text-align:center;" | '''x'''| style="text-align:center;" | ½ ½ 1 0| style="text-align:center;" | ½ ½ ½ 1| style="text-align:center;" | ½ ½ 1 1| style="text-align:center;" | 1 0 ½ ½| style="text-align:center;" | 1 ½ ½ 1| style="text-align:center;" | ½ 1 1 0! 17|-! 3 | [[IgelRubiChess|RubiChess TCEC-S21]]* | style="text-align:center;" | 0 ½ 0 ½| style="text-align:center;" | ½ ½ 0 1| style="text-align:center;" | '''x'''| style="text-align:center;" | ½ ½ ½ 1| style="text-align:center;" | ½ 1 1 ½| style="text-align:center;" | ½ ½ ½ ½| style="text-align:center;" | 1 ½ 1 ½| style="text-align:center;" | ½ ½ 1 0! 15½|-! 4 | [[Slow Chess|SlowChessBlitz 2.54 avx]]* | style="text-align:center;" | ½ ½ 0 1| style="text-align:center;" | ½ ½ ½ 0| style="text-align:center;" | ½ ½ ½ 0| style="text-align:center;" | '''x'''| style="text-align:center;" | 0 ½ ½ 1| style="text-align:center;" | 1 ½ 1 ½| style="text-align:center;" | 0 ½ ½ ½| style="text-align:center;" | ½ ½ ½ 1! 14|-! 5 | [[RubiChessPedone|Pedone 20210528]]* | style="text-align:center;" | 0 ½ 0 ½| style="text-align:center;" | ½ ½ 0 0| style="text-align:center;" | ½ 0 0 ½| style="text-align:center;" | 1 ½ ½ 0| style="text-align:center;" | '''x'''| style="text-align:center;" | 1 ½ ½ 1| style="text-align:center;" | 1 ½ ½ 0| style="text-align:center;" | ½ ½ ½ 1! 12½|-! 6 | [[Xiphos|Xiphos 0.6.1]]* | style="text-align:center;" | ½ 0 ½ 0| style="text-align:center;" | 0 1 ½ ½| style="text-align:center;" | ½ ½ ½ ½| style="text-align:center;" | 0 ½ 0 ½| style="text-align:center;" | 0 ½ ½ 0| style="text-align:center;" | '''x'''| style="text-align:center;" | ½ ½ ½ 1| style="text-align:center;" | ½ 1 ½ ½! 12|- style="background-color:#ffcccc;"! 7 | [[PedonerofChade|rofChade 2.309]]* | style="text-align:center;" | 0 ½ 1 ½| style="text-align:center;" | 0 ½ ½ 0| style="text-align:center;" | 0 ½ 0 ½| style="text-align:center;" | 1 ½ ½ ½| style="text-align:center;" | 0 ½ ½ 1| style="text-align:center;" | ½ ½ ½ 0| style="text-align:center;" | '''x'''| style="text-align:center;" | 0 ½ ½ 1! 12|- style="background-color:#ffcccc;"! 8 | [[Nemorino|Nemorino 6.08]]| style="text-align:center;" | ½ ½ ½ 0| style="text-align:center;" | ½ 0 0 1| style="text-align:center;" | ½ ½ 0 1| style="text-align:center;" | ½ ½ ½ 0| style="text-align:center;" | ½ ½ ½ 0| style="text-align:center;" | ½ 0 ½ ½| style="text-align:center;" | 1 ½ ½ 0| style="text-align:center;" | '''x'''! 11½|}<span id="Premier"></span>==Premier Division==
'''[[TCEC Season 20#Premier|< Prev]] [[TCEC Season 22#Premier|Next >]]'''<br/>
<span id="Sufi"></span>
==Superfinal== '''[[TCEC Season 20#Sufi|< Prev]] [[TCEC Season 22#Sufi|Next >]]'''<br/>July 20 - August 07, 2021, timecontrol 120'+10" <ref>[https://tcec-chess.com/#div=sf&game=1&season=21 S21 - Superfinal | TCEC - Computer Chess Broadcast]</ref><br/> {| class="wikitable"! # ! Engine ! W! D! L! P<span style="font-size: 80%; vertical-align: sub;">100</span>|- ! 1| [[Stockfish|Stockfish 14_202107131735]]| style="text-align:right;" | 19| style="text-align:right;" | 74| style="text-align:right;" | 7! 56 |-! 2| [[Leela Chess Zero|LCZero 0.28-dev+_69626]]| style="text-align:right;" | 7| style="text-align:right;" | 74| style="text-align:right;" | 19! 44 |} After round 91 on August 05, 2021, [[Stockfish|Stockfish 14_202107131735]] had already 50½. =Publications=* [[Matthew Sadler]] ('''2021'''). ''TCEC Season 21 SuperFinal Review''. [https://tcec-chess.com/articles/Sufi_21_-_Sadler.pdf pdf]
=Postings=
* [https://www.chessdom.com/booot-kicks-into-high-gear-wins-tcec-s21-l4/ Booot kicks into high gear, wins TCEC S21 L4], [[Chessdom]], May 25, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77503 will Tcec allow Stockfish with a Leela net to play?] by Wilson, [[CCC]], June 17, 2021
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=77908 TCEC21 is over] by Kanizsa, [[CCC]], August 08, 2021
=External Links=
* [https://wiki.chessdom.org/TCEC_Leagues_Season_21 TCEC Leagues Season 21 - TCEC wiki]
* [https://en.wikipedia.org/wiki/TCEC_Season_21 TCEC Season 21 from Wikipedia]
* [https://www.youtube.com/channel/UCq06gd_5HTiG8IIu5-enWyA Silicon Road] by [[Matthew Sadler]], [https://en.wikipedia.org/wiki/YouTube YouTube]Videos
=References=