The idea is solid, but the whole success of your game strictly depends on how much one likes chess :)
It would be nice to have a singleplayer mode, but from the comment, I see you are working on it.
There is one thing I'm wondering about. I think it's absolutely possible to force a draw with that kind of rules, just by disabling a number of tiles.
And one more thing- I think at some point the game wouldn't let me make a legal move, but this is something I might have imagined, because I didn't take a screenshot to prove it.