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Felicity Tablebases,
are open source endgame tablebases in C++ for chess, Xiangqi and Jeiqi developed by Nguyen Pham, providing some popular metrics such as depth to mate and 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.

Progress reports

Felicity Tablebase is not a ready-to-use one but a work in progress for studying/researching. It is not fixed immediately to specific things such as metrics, board presentations, algorithms for compressing, or backward/forward generators. Instead, it will test as much as possible with them to find the best ones. Not every attempt/work is successful. The project creates some reports on forums to report all attempts and works.

The name Felicity is inspired by the song Felicità by Al Bano & Romina Power^[1].