Neat! I built a similar chess variant based on Chess 2 by Dave Sirlin[0]. You can play that one online here: https://www.chess2online.com

The nice part about Chess 2 is that the different armies are playable in any combination, which adds lots of variety to the game (although there are some balance issues which are addressed through the official tournament rules).

[0] Apparently Sirlin didn't really like the rule set he published so he fundamentally changed the rules a while back but kept calling it Chess 2, unfortunately.