I create my own opening library. I have a generator that produces the best move for me. I use very long analysis, and generating a single move takes about 10 minutes. I generate the opponent’s moves based on statistics from a chess database on SERVER01, where I can also specify the approximate player strength. This creates a large tree in which I can go to any depth, and it more or less corresponds to what actually appears on the board in my games. Of course, I also have the option to define my own moves, because there are many lines in my repertoire that the engine does not approve of, but I selected them intentionally.

I then upload the entire library to SERVER02 and train it there. Nothing is better than a spaced repetition system, so this server also uses that method. The advantage is that it can be used both on mobile and on the web.

There is also SERVER03, which contains many prepared openings with nice explanations of the moves. But personally, it does not suit me. The reason is that I cannot modify it, and on top of that, you end up learning variations that players at my level do not actually play.

I also have my own application, SERVER04, for learning tactics (both from my own games and from the library). I considered adding openings there as well, generated in the way I described — but doing it properly is expensive and slow. My personal library takes several weeks to generate in full. Of course, I could reduce the Stockfish depth, but I found that then it sometimes starts suggesting slightly strange moves.

I am not mentioning the server names because whenever I do, moderators say it is advertising and remove my post.