I have contacted the creator of Cardinal Super Chess to know the details of her rules (castling, initial P's move, promotion). She replied "My board and innovations are copywritten. I am not revealing all my rules as yet, until I produce it. I have some special rules. I know you understand".
To be frank, no, I don't understand the need to hide rules of a chess variant. But I respect that choice. Whatever, I think I have my answer, it is very unlikely that Devingt Chess has been copying Cardinal SC, as I was suspecting knowing its author, quite poorly informed about chess variants.
I have contacted the creator of Cardinal Super Chess to know the details of her rules (castling, initial P's move, promotion). She replied "My board and innovations are copywritten. I am not revealing all my rules as yet, until I produce it. I have some special rules. I know you understand". To be frank, no, I don't understand the need to hide rules of a chess variant. But I respect that choice. Whatever, I think I have my answer, it is very unlikely that Devingt Chess has been copying Cardinal SC, as I was suspecting knowing its author, quite poorly informed about chess variants.