King and Queen vs King

Obviously we can all mate a king when we have a king and a queen. Making that a bit more challenging,

You have an empty board with your king and queen on it, say, you start with king a e1 and queen at d1. Your opponent start with his king at e5. After that, on each move your opponent marks the king's move secretly - a legal move but one you don't know. Is it still possible to force a mate?

Using a three-dimensional board, 8 x 8 x 8. King and queen vs king. The king can move in any of the surrounding 26 squares, and the queen in any of the 26 directions as far as there is room. Can the king and the queen force a mate?

Is the position of the black king revealed if the white king tries to attack it?

Originally posted by Thomaster
Is the position of the black king revealed if the white king tries to attack it?

It seems like you'd at least have to be able to attempt moves with your King that may be illegal (move into check), in which case it would probably be adequate to retry if your attempted move isn't legal.

aye, one-sided kriegspiel rules. Doing an impossible move has the opponent say "no". checks are not announced.

In that case the queen divides the board into parts, and the king checks in which part the other king is (by moving into the areas).

that works.. and on king + rook vs king wouldn't as the stealthy king could sneak up on the rook.