The application is being refactored at this moment on branch "after-refactoring", but the old version is deployed (master branch)

Project deployed HERE.

What helped me to do this project:

1. Initial project with Hello Roman (https://www.youtube.com/watch?v=xMcFPl4Ujhc);
2. Chess openings from https://github.com/hayatbiralem/eco.json;
3. Artlicle about chess algorithm from https://www.freecodecamp.org/news/simple-chess-ai-step-by-step-1d55a9266977/;
4. My interest of chess;
5. Desire to have a nice project;

TO_DO:

-clean code (possible to some extent);
-repair error during castling (it only appears in console but app works);
-make AI smarter and faster (I am too dumb to improve that at this moment);
-load position according to pgn (also from FEN if it was done);
-and I do not have more ideas currently;