Changes

In March 2020, an anonymous poster who came into possession of Houdini 6's source code, apparently due to access to a [https://en.wikipedia.org/wiki/Apache_Subversion subversion] server owned by Robert Houdart, claimed Houdini 5 and 6 were [[Stockfish]] derivatives <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=10&t=73433 Houdini is a Stockfish Derivative (and started life as a Robbolito derivative)] by cucumber, [[CCC]] (Engine Origins requires registration), March 22, 2020</ref> <ref>[https://groups.google.com/d/msg/fishcooking/DygaIdBvJm0/cjtMosvdBQAJ Houdini is a clone of Stockfish 8] by c9publice...@gmail.com, [[Computer Chess Forums|FishCooking]], March 26, 2020</ref>. In summer 2021, the Stockfish team filed a [https://en.wikipedia.org/wiki/Lawsuit lawsuit] against [[ChessBase]] to enforce the consequences of the accused license termination concerning [[Fat Fritz#Fat Fritz 2|Fat Fritz 2]] and the allegedly Stockfish derivative Houdini 6 sold by ChessBase <ref>[https://stockfishchess.org/blog/2021/our-lawsuit-against-chessbase/ Our lawsuit against ChessBase], [[Stockfish|The Stockfish team]], [[Computer Chess Forums|Stockfish Blog]], July 20, 2021</ref>.