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an [[UCI]] compliant [[:Category:Open Source|open source]] chess engine by [[Edsel Apostol]], written in [[Cpp|C++]] and licensed under the [[Free Software Foundation#GPL|GPL v3.0]], first released in September 2018 <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=68538 Invictus chess engine r228] by [[Edsel Apostol]], [[CCC]], September 29, 2018</ref>.
Invictus is influenced by other open source engines in particular [[Stockfish]], [[Ethereal]], [[Defenchess]], and [[Minic]] concerning [[Texel's Tuning Method]] <ref name="readme">[https://github.com/ed-apostol/InvictusChess/blob/master/README.md InvictusChess/README.md at master · ed-apostol/InvictusChess · GitHub]</ref>.
[[Tom Kerrigan]] of [[TSCP]] fame is given credit for sharing the [[ABDADA|Simplified ABDADA]] idea <ref>[http://www.tckerrigan.com/Chess/Parallel_Search/Simplified_ABDADA/ Simplified ABDADA] by [[Tom Kerrigan]]</ref>. Invictus r324 had its tournament debut at [[TCEC Season 21]] in May 2021.
=Features=
