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'''Felicity Tablebases''',<br/>
are open source endgame tablebases in C++ for chess, [[Chinese Chess|Xiangqi]] and [[Jeiqi]] developed by [[Pham Hong Nguyen|Nguyen Pham]], providing some popular metrics such as [[Endgame Tablebases#DTM|depth to mate]] and [[Endgame Tablebases#DTC|depth to convert]] information. First published in 2018, it supported only Xiangqi at that time and it used a special compression algorithm to create and run with a very small-size EGTB. In April 2024, Nguyen Pham restarted the project, rewrote the whole code, added the generator, and supported chess, Xiangqi and Jeiqi.
The name Felicity is inspired by the song Felicità by Al Bano & Romina Power<ref>[https://www.youtube.com/watch?v=xUj-lfx6vbo Al Bano & Romina Power - Felicità (Musikladen 11.03.1982)]</ref>.
=Progress reports=
Felicity Tablebase is not a ready-to-use one but a work in progress for studying/researching. It is not fixed stuck immediately to specific things such as metrics, board presentations, algorithms for compressing, or backward/forward generators. Instead, it will test tries testing as much as possible with them multiple options to find the best ones. Not every attempt/work is successful. The project creates some reports on some forums to report all attempts , works and worksresults.
=License=
