Average Training Depth

Each course has a detailed page where you can learn about its content and the topics covered. You can also view additional information under the 'Variations Overview' section within the course details:

The Avg. Training Depth indicates the number of moves a variation (or exercise) in the chapter lasts on average.

For example, in the screenshot above, trainable lines last 4.5 to 6.3 moves on average in this course's chapters.