Lyudmil Tsvetkov

Lyudmil Tsvetkov served for a long time as a Bulgarian diplomat.

During his free time, he used to play chess and soon attained the title of

Bulgarian candidate master.

The rise of computer chess with the appearance of top-level programs like

Stockfish and Komodo soon captivated him entirely, and in late 2013 he decided

to quit his full-time job to be able to concentrate completely on playing and

analysing chess.

In 2010, he published a "Little Chess Evaluation Compendium," that is available

as a free download.

In 2012, he expanded considerably on it.

In the last couple of years he has been very active in contributing to develop

Stockfish, the strongest chess engine on Earth.

In 2017, he published "The Secret of Chess," a ground-breaking work, exploring

unchartered territories of chess knowledge.

2019 saw the release of "The Fine Art of Chess," a deeply annotated collection of highly instructive games.