Don't randomly put things in parentheses. Liberate "six-sided," please. I'd rewrite the last sentence as, "Even if a piece temporarily moves as a king, you are not checkmated until your actual king is captured." Actually, I wouldn't put the sentence in at all, but if you feel it is necessary, change it to this.

When selecting pieces to move, do you select them one at a time or all at once? In other words, if I can move three pieces, can I select one piece, roll a die, move it, then select another piece? Or do I declare all pieces I intend to move, then roll a die for each one before moving it?

Can I move the same piece multiple times if I get a "move two pieces" or "move three pieces" roll? What if the player has less than the amount of pieces rolled? You could clarify by adding an "up to" phrase before each number, but that would then give the player the option to move less pieces even when he has enough to move multiples -- and I'm not sure if you wanted the power to play this way. I'm not saying there's anything wrong here, but there are a fair amount of questions a player could ask, and these warrant consideration.

Yo, is everything clear now?