It all depends on how exotic the rules for your variant are. If these are not too unusual, you could create an Interactive Diagram for it.
Without having any clue about what your variant is like, it will be hard to give sensible advice. Is it 2- or 3-dimensional? Are the cells square, hexagonal or irregular? What is the shape of the board, and how many cells does it have? Do pieces move regularly from one cell to the other, replacing what was in the latter, in a way that only depends on their type, or do they exert all kind of side effects on each other? Is there a single royal piece that you have to checkmate to win? Etc....
It all depends on how exotic the rules for your variant are. If these are not too unusual, you could create an Interactive Diagram for it.
Without having any clue about what your variant is like, it will be hard to give sensible advice. Is it 2- or 3-dimensional? Are the cells square, hexagonal or irregular? What is the shape of the board, and how many cells does it have? Do pieces move regularly from one cell to the other, replacing what was in the latter, in a way that only depends on their type, or do they exert all kind of side effects on each other? Is there a single royal piece that you have to checkmate to win? Etc....