Endgame Table-bases allow perfect play, both with and without the fifty-move drawing rule.

• They allow winning all won positions and bringing all drawn positions over the fifty-move line.
• For example in ending with KRvK.

Due to the huge size of these tablebases, they are usually limited to only the last few remaining end-games, with up to 7 pieces.

• The 7-piece tablebase contains 423,836,835,667,331 unique legal positions in about 18 Terabytes.

Encoding

Nalimov

Syzygy

           Format   5s Size  Has 6 piece    Notes
FEG          DTM     5.7GB    Yes  500GB+
Nalimov      DTM     7.2GB    Yes, 1.2TB    Doesn't have 5 vs 1
Gaviota      DTM     6.5GB     No           Multiple compression methods
RobboBases   DTC     3.4GB    Yes, 475GB    Also with blocked pawns
Scorpio      WLD     340MB*    No           Size is for half the bases
Shredder     WLD     441MB     No           Only 157MB for half the bases
TripleBases  WLD     570MB    Yes, 100GB    Also with blocked pawns


DTM = Distance To Mate,
WLD = Win, Loss, Draw

https://syzygy-tables.info/

https://github.com/syzygy1/tb

http://www.talkchess.com/forum3/viewtopic.php?start=0&t=66797&topic_view=flat