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a [[Chess Engine Communication Protocol]], and since version '''8.0''', [[UCI]] compliant [[:Category:Open Source|open source engine]] under the [[Free Software Foundation#GPL|GPL]] written by [[Alcides Schulz]] in [[C]]. Tucano was first released in September 2012 <ref>[http://www.talkchess.com/forum/viewtopic.php?t=45066 Tucano chess engine 1.00] by [[Alcides Schulz]], [[CCC]], September 09, 2012</ref>. As of version '''10''', released in January 2022, Tucano uses [[NNUE]] [[Evaluation|evaluation]] <ref>[https://www.talkchess.com/forum3/viewtopic.php?f=2&t=79172 ucano 10.00 release - Neural network evaluation] by [[Alcides Schulz]], [[CCC]], January 20, 2022</ref>.

==[[Evaluation]]== Starting with the version '''10''' release in Janauary 2022, Tucano applies [[NNUE]] [[Evaluation|evaluation]]. The network was trained on about 1.5 billion positions generated by Tucano with handcrafted evaluation at [[Depth|depth]] 8 using [[Hisayori Noda|Nodchip's]] [[Stockfish NNUE]] training code, along with probing code from [[Daniel Shawul|Daniel Shawul's]] [[Scorpio#ScorpioNNUE|Scorpio NNUE]] [[Scorpio#Bitbases|egbbdll]] library <ref>[https://github.com/alcides-schulz/Tucano/blob/master/README.md Tucano/README.md at master · alcides-schulz/Tucano · GitHub]</ref>.  * [[NNUE]] since '''10.00''' Prior to Tucano 10, the handcrafted [[Evaluation|evaluation]] features featured most common terms <ref>[http://www.talkchess.com/forum/viewtopic.php?t=47532 Eval development: is it better to tune or add new terms?] by [[Alcides Schulz]], [[CCC]], March 17, 2013</ref> with speculative calculation and aggregation of [[Opening|opening]] and [[Endgame|endgame]] [[Score|scores]]. The final score is [https://en.wikipedia.org/wiki/Interpolation interpolated] by [[Game Phases|game phase]] within a [[Tapered Eval|tapered evaluation]], with an additional [[Draw|draw]] adjustment in pawnless endgames.

* [http://ccrl.chessdom.com/ccrl/4040/cgi/compare_engines.cgi?family=Tucano&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 Tucano] in [[CCRL|CCRL 40/4015]]