This is the rule book for the fun chess game known as ActiChess (AKA: Active Chess).
CHESS HAS EVOLVED.
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Actichess rULES for new online chess game variant.
I can't put this on the reddit page, so I'll write this here. I haven't done the maths yet but I'm 99% sure that Knight piece is very weak due to being double colourbound (it can only ever be on 1 in 4 squares, which ones depending on starting position)also, there is a loophole which may be what you're going for but I can't be sure: you say other pieces can't be moved when you're in check but sometimes pieces can be placed between the king and the attacker. However, your rule disables this.