Changes

Syzygy EGTB is significantly smaller than all any [[Endgame Tablebases#DTM|DTM]] EGTBsEGTB. It is 7 times as small as Gaviota for 5 men, 8 times as small as Nalimov for 7 6 men, 8 times as small as Lomonosov for 7 men. However, when all DTM EGTBs have full data of two sides, Syzygy EGTB omits data of one side for DTZ data to save space. [[Ronald de Man]] estimated that if keep them all, the Syzygy's 6 men size may increase 158 GB, become 307 GB in total, double on size, 4 times as small as Nalimov 5 6 men. 

On the first release (Apr 0201, 2013) the generator was ready to generate all endgames up to 6 men. The generation is multithreaded and processed processes completely in RAM. To generate all 6 men, it requires a system with at least 32 GB of RAM and working may run in 5 days (the period was measured with a computer 6-core i3930K @ 4.2Ghz, 64 GB).

Generation Ronald de Man wasn't initially interested in the creation of 7-man tablebases would require about 1 TB of RAM. Generation time will be about 64 x per table, which means around 175 x time total men Syzygy Based <ref>[http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=6&t=73967618#p83338 p83771 Re: Syzygy tb generator for windows7-piece syzygy] by [[Ronald de Man|syzygy]], [[Computer Chess Forums|CCRL Discussion Board]], June 01July 03, 2014</ref> since the generation would require about 1 TB of RAM, too expensive at that time. Ronald de Man wasn't initially interested in creation of 7-men Syzygy Based Generation time would be about 64 x per table, which means around 175 x time total <ref>[http://kirill-kryukov.com/chess/discussion-board/viewtopic.php?f=6&t=76187396#p83771 p83338 Re: 7-piece syzygySyzygy tb generator for windows] by [[Ronald de Man|syzygy]], [[Computer Chess Forums|CCRL Discussion Board]], July 03June 01, 2014</ref>.His original generator could not create them. But in 2018, he supported [[Bojun Guo]] in his 5 -month attempt to generated them <ref>[http://www.talkchess.com/forum/viewtopic.php?t=66797 7-men Syzygy attempt] by [[Bojun Guo]], [[CCC]], March 10, 2018</ref>. His hardware was estimated at over US$ 90K. In August of 2018 their creation was completed<ref>[https://syzygy-tables.info/ Powered by Ronald de Man's Syzygy endgame tablebases, 7-piece tables generated by Bojun Guo and a public API hosted by lichess.org], August 19, 2018</ref><ref>[http://tablebase.lichess.ovh/tables/standard/7/ Index of /tables/standard/7/ on lichess], August 19, 2018</ref>.

* Small sizes. It is about 8 times as small as the second-best EGTBs. Having small sizes is the main success key of Syzygy Bases since it helps is much easier to create, store and , provide it much easier , download than other EGTBs

* Hard to integrate with chess engines. [[Ronald de Man]] has not provided probing code as an independent library. Instead, he provided it but as a part of [[Stockfish]] chess engines. The probe code has integrated too deeply with that chess engine code and it requires a lot of effort to de-integrate. All make the reuse of the code for , modify and integrate with other chess engines become hard jobsprojects* Hard to understand and contribute to the project. ETGB itself is a hard topic. Syzygy EGTB has also integrated with many advance advanced techniques/tricks. It is written in old-style C language. All make it become very hard to understand and/or modify to improve or for other purposes* [[Endgame Tablebases#DTZ50|DTZ50]] metric may lead the engines to win in much longer and ugly ways, compared with [[Endgame Tablebases#DTM|DTM]] one

[[Ronald de Man]] has provided only open source code for generators/probers but not endgame files themselves. Using his tools some people have generated endgames and published them via DVD or online such as FTP servers of [[Bojun Guo]] and [[Lichess]].