How are the next puzzles chosen for me when I am training?
By default, the next puzzle for you is chosen randomly from within a pool of puzzles that are within a rating band close to your current rating. As you move up or down in rating your available pool of puzzles changes.
However, if you want to concentrate on a specific kind of puzzle, you can go into 'custom' (unrated puzzles) and select what themes you want to focus on:
Then check the box of any theme you want to practice:
You can choose one, or as many as you like at once!
keywords: tactics choose next problem chosen random