user4549: Assuming the rules of millennium 3d chess, what are the minimum required pieces for checkmate?
I realize this is an extremely difficult question, but in regular (2-dimensional) chess, we have rules of thumb for when two players should draw during the endgame.
A few examples of these kinds of scenarios (in 3d chess) would be much appreciated. 

user295: The following are minimum involving various pieces:
King + Queen
King + Rook + Any Piece
King + 2 Bishop
King + 2 Knight
This is only the theoretical minimum to actually mate. Whether or not it is possible to force a mate in this situation is a different question. You can see these mates by placing both kings in a corner, one on board 1, and the other on board 3.

4549: <p>Assuming the rules of <a href="http://www.oocities.org/william_dagostino/millennium_3d_chess.pdf" rel="nofollow">millennium 3d chess</a>, what are the minimum required pieces for checkmate?</p>

<p>I realize this is an extremely difficult question, but in regular (2-dimensional) chess, we have rules of thumb for when two players should draw during the endgame.</p>

<p>A few examples of these kinds of scenarios (in 3d chess) would be much appreciated. </p>
 295: <p>The following are minimum involving various pieces:</p>

<p>King + Queen<br>
King + Rook + Any Piece<br>
King + 2 Bishop<br>
King + 2 Knight</p>

<p>This is only the theoretical minimum to actually mate. Whether or not it is possible to force a mate in this situation is a different question. You can see these mates by placing both kings in a corner, one on board 1, and the other on board 3.</p>
