I have created a miniature chess puzzle that takes advantage of a piece of chess semantics that has some debate to it.
This is the puzzle:
Construct a legal (meaning that two opposite colored Kings are required) chess position that has a combination of 7, no more and no less, pieces and pawns, that has at least 54 checkmates in two in total. It is up to you to decide the color and figure out the material distribution.
Note that there must be no possible mates in one in the initial position.
To my knowledge, the solution that I made is unique, not counting the ability to mirror it and color switching. But I am not entirely sure, so that is why I stipulate at the least.
Additionally, can you identify what part of chess semantics that this puzzle takes advantage of?