Chess Opening Trainer (TRIAL)

This TRIAL VERSION only drills you on 5 moves at a time.

*Seven Short Paragraphs With Everything You Need to Know:*

1. This is a very simple App I made for myself, but hope you find useful. It allows you to enter chess openings you want to learn and then test yourself on them. Think interactive flashcards. That's it. That's all it does. There are tons of resources out there to help you decide on your opening, but this is not one of them.

2. You have two opening trees, one for white and one for black. Edit them as much as you want, add comments, import from a PGN, or export the PGN for whatever nefarious purposes you may have.

3. For training, navigate to the node from which you want to train and practice from there. It will quiz you on all the positions below that node.

4. If you go to the starting position, it will train you on the whole tree.

5. There are three training modes: Random, Breadth first, and Depth first.

6. Random will jump around, breadth-first will do each layer in turn, and depth-first will complete each line before going back to the last fork. Any that you get wrong will be re-done at the end.

7. If you import a PGN it will blend it into the existing tree.

**********

The above should be enough to get started. Below is a FAQ:

Q: Are you any good at chess?

A: No. I'm not a great coder either. Frankly, this whole project's existence is a miracle.

*****

Q: How do I enter my variations?

A: Just enter them in the setup screen. You can see the moves that are already in your tree in the navigation section. You can navigate with the buttons or by making that move on the board. If you make a move on the board that isn't part of your tree already, that move will be added to your tree automatically. If you go back, you will see it in the list of moves at the bottom.

Note, it only shows up to 15 moves in the navigation at the bottom of the screen. If your move doesn't show up, it will still be part of the tree. You just have to do the move on the board to get there. I don't know who would prepare for more than 18 moves from a given position, but you do you.

You can also import a PGN by copy and pasting it in the Import PGN popup.

*****

Q: How do I enter comments?

A: Just enter them in the comments section. The comments for your turn will flash up briefly when you enter it correctly during training. And the opponent's turn will appear when you are being asked to respond to it. If you edit the comment, it saves immediately.

*****

Q: How do I delete parts of my tree?

A: Navigate to the move you want to delete and then hit the delete button. Note that it will prune the tree at this point. All moves after that position will be deleted also. You can't delete the root position, so if you want to start with a nice, fresh empty tree, you need to navigate into each of the moves that appear in the starting position and delete those. That will delete everything, because it prunes all moves past those moves also.

For example, suppose you have 1. e4 c5 (Sicilian Defense) entered into your tree with a whole tree of lines dealing with variations beyond that. If you navigate to 1. e4 c5 and hit "Delete variation" all those Sicilian lines will be deleted. You will be shown the position after 1. e4, and 1... c5 will no longer be a part of your tree. You might do this if, for example, you have a new variation that you want to do against the Sicilian and you want to import the PGN without keeping what you've already entered.

Recent changes:
Fix safe-area insets, practice count, training overshoot, board lock during continue, retry scoring