Is there any tool that can help us learn openings by heart? I tried to use Fritz but without success.
3 Answers
Two well-known programs that are meant specifically to aid in the memorization of opening variations are
- Chess Position Trainer
- Chess Openings Wizard (formerly Bookup)
Both programs are designed to recognize and handle transpositions seamlessly, and they allow a player to drill all the positions that are part of any repertoires that he or she inputs.

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Chessable is famous for learning chess openings by the MoveTrainer space repetition. Check out MoveTrainer at https://www.chessable.com/movetrainer.

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Personally I use Chessable. It makes you play through all the variations when you review a course, and there are a bunch of free courses on there that are excellent for getting started with an opening.
The Short & Sweet series is pretty good. Sam Shankland, Anish Giri, and a bunch of other masters have some good S&S courses that are 20-30 lines or so, as they are just a demo version of the massive "Lifetime Repertoires" series. They're great for club players.
There are also free courses published by community members that are more extensive. I used the "Ruy Lopez: Masterclass Edition" course to learn a new opening that I now enjoy immensely.
If those aren't enough for you, you can find some pretty low-priced courses on more or less anything you want. Lifetime Repertoires courses are expensive and have huge numbers of lines, but there are smaller ones you can get for a lower price. For example, I am an owner of "Rafael Leitao's Najdorf Sicilian" which was around $5 and has 150 lines or so.

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