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the Top Chess Engines Competition, prior to [[TCEC Season 8|season 8]] in 2015 called the '''Thoresen''' Chess Engines Competition, is a private tournament and rating list <ref>[http://tcec.chessdom.com/archive.php TCEC - Archive Mode] has the Official TCEC Ratings calculated using [[Ordo]] by [[Miguel A. Ballicora|Miguel Ballicora]], bottom-right</ref> , organized, directed and hosted by [[Martin Thoresen]] , and since [[TCEC Season 8|season 7]] by [[Anton Mihailov]], [[Chessdom]]. It's goal is to provide viewers a live broadcast <ref>[http://www.tcec-chess.net/live.php TCEC - Live Computer Chess Broadcast]</ref> of matches played between strong chess engines. Supported by original engine authors in providing their engines, and based on voluntariness and [https://en.wikipedia.org/wiki/Donation donation], TCEC does not enforce [[ICGA]] [[ICGA Tournament Rules|rules]] and [[Rybka Controversy#RybkaDecision|sanctions]] concerning engine originality. Starting in 2010, TCEC caused a furor in February 2011, when [[Houdini|Houdini 1.5]] defeated [[Rybka|Rybka 4.0]] in a match, with the event recognized in various chess blogs <ref>[http://www.chessdom.com/news-2011/houdini-rybka-computer-chess-live Houdini – Rybka LIVE! | Chessdom]</ref>. After a break in 2011 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=39217 TCEC announcement: End of project] by [[Martin Thoresen]], [[CCC]], May 28, 2011</ref> , Thoresen relaunched TCEC in January 2013 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=46861 Official (re)launch of TCEC - website is up!] by [[Martin Thoresen]], [[CCC]], January 12, 2013</ref> . In August 2013, for the start of [[TCEC Season 5|season 5]], TCEC joined forces with [[Chessdom|Chessdom Arena]] <ref>[http://www.chessdom.com/tcec-computer-chess-championship-starts-august-26th/ TCEC computer chess championship New Season starts August 26th | Chessdom], August 15, 2013</ref> <ref>[https://arena.chessdom.com/ Chessdom Chess Arena - Play Online Chess]</ref> .