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a sophisticated [[Open Source Engines|open source chess engine]] by [[Daniel Shawul]], written in [[Cpp|C++]] and compliant to the [[Chess Engine Communication Protocol]] with builds running under [[Windows]] and [[Linux]]. Scorpio participated at the [[CCT9]], [[CCT11]] and [[CCT12]] [[Tournaments and Matches#online|online tournaments]], and played the [[ICT 2007]] over the board. It is base of Daniel's [[General Game Playing|general game playing]] engine [[Nebiyu]], able to play [[Chess#Variants|Chess variants]], [[Checkers]], [[Othello|Reversi]], [[Go]] and [[Amazons]] <ref>[http://sites.google.com/site/dshawul/home Scorpio Chess and Nebiyu Alien]</ref>. Scorpio '''2.7.9''', released in December 2017, optionally features a [[Monte-Carlo Tree Search]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=66032 Scorpio 2.7.9] by [[Daniel Shawul]], [[CCC]], December 16, 2017</ref>.

Scorpio '''Scorpio 2.87.9''', released in February 2018 December 2017, optionally provides features a [[Monte-Carlo Tree Search]] using (MCTS) <ref>[http://www.talkchess.com/forum/viewtopic.php?t=66032 Scorpio 2.7.9] by [[Daniel Shawul]], [[CCC]], December 16, 2017</ref>. Scorpio '''2.8''' in February 2018, MCTS with [[Alpha-Beta|alpha-beta]] [[Bojun Huang#Rollout|rollouts]] as suggested [[Bojun Huang]] <ref>[[Bojun Huang]] ('''2015'''). ''[https://www.semanticscholar.org/paper/Pruning-Game-Tree-by-Rollouts-Huang/a38b358745067f71a9c780db117ae2471e693d63 Pruning Game Tree by Rollouts]''. [[AAAI]]</ref>. The parallel search for MCTS uses virtual loss to distribute work among [[Thread|threads]] in standard MCTS rollouts, and [[ABDADA]] like BUSY flag for alpha-beta rollouts. ABDADA and parallel MCTS from the Go world are very similar in nature <ref>[http://www.talkchess.com/forum/viewtopic.php?t=66552 Scorpio 2.8] by [[Daniel Shawul]], [[CCC]], February 10, 2018</ref>.