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

https://syzygy-tables.info/

https://github.com/syzygy1/tb

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