Changes

Fire '''4''', released in December 2014, was a compete re-write and does not use any source code from or related to [[Ippolit]]. It supports [[Syzygy Bases]], and includes a revamped memory management which uses [https://en.wikipedia.org/wiki/OpenMP OpenMP] [https://en.wikipedia.org/wiki/C_preprocessor#Compiler-specific_preprocessor_features #pragmas] to utilize [https://en.wikipedia.org/wiki/Thread-local_storage thread local storage] <ref>[https://software.intel.com/en-us/articles/use-thread-local-storage-to-reduce-synchronization Use Thread-local Storage to Reduce Synchronization | Intel® Developer Zone], November 2, 2011</ref> and minimize the amount of 'shared' resources among [[Thread|threads]] for its [[Parallel Search|SMP implementation]]. [[Engine Testing|Testing]] was done via massive parallel, automated 24/7 ultra-fast chess engine matches using [[Cutechess-cli]] and [[LittleBlitzer]]. Code changes were tested to a very high level of confidence using [[Match Statistics#Likelihood of superiority|LOS]] and [[Match Statistics#SPRT|SPRT]] (min. 40,000 games) against a pool of top engines. Development and testing included approx. 200,000 - 240,000 ultra-fast games per day <ref>Information provided by [[Norman Schmidt]], July 2015</ref>. According to a [[CCC]] posting by anonymous poster cucumber in September 2020, Fire 4 was later released as open source engine [[Gull#SeaGull|Seagull]] based on [[Gull]], hiding its Fire 4 origin <ref>[http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75150&start=170 Re: Fire 7.1 GPLv3 Source Request] by cucumber, [[CCC]], September 23, 2020</ref>.

* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75150 Fire 7.1 GPLv3 Source Request] by [[Andrew Grant]], [[CCC]], September 18, 2020» [[Stockfish]]: [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75150&start=170 Re: Fire 7.1 GPLv3 Source Request] by cucumber, [[CCC]], September 23, 2020 » [[Gull#SeaGull|Seagull]]