There is no widely recognized software, library, or artistic project currently known as or a tool with that specific name used to "generate pieces."

It can describe a mechanic where a character is pushed back upon contact with an enemy.

In game development or graphics scripts (like Python's turtle library), it refers to a command that moves an object or cursor backward along a path to complete a shape or "reverse move".

The term "backmove" is most commonly used in technical contexts such as:

If you are looking for a specific digital art generator or a code snippet to create a visual "piece" using a backward movement logic, I can help you draft a script (e.g., in Python) to generate an abstract geometric design.