Can you think about an impossible position ?

Set up a position in which black is checkmated by two Knights alone. Impossible to reach that position.

Oh, here ya go
lichess.org/editor/k7/2N5/1KN5/8/8/8/8/8_w_-_-

#41 it is possible but cannot be forced.

@Microraver this is totally possible.

Using the normal rules of chess? Put the 4 pieces on any starting square you like and make a list of moves to reach that position. You'll find that the black king would have to move *through* check (or 'pass')
at one point to get to the mating position. Yes, it cannot be forced, but it cannot even be 'helpmated'*. You would have to violate the rules.
*But yes, there are several positions that can be helpmated with two knights, so there's that :)

@Microraver to make it easier, you can add a knight to black. In white's final move, the checking knight takes the knight. The other white knight and king block escape squares, making it checkmate.

1. .... Xc7 2.Nxc7#

Which piece is X?

it could be any piece. White could have promoted to a knight and checked the king there, or black just captured the piece on c7 like a dumbass. but it theoretically could be any piece except for a pawn.

Strangely enough, I have thought of many impossible positions before this topic.

Some illegal positions I made moves for involve positions with multiple kings of the same color.



















It is now impossible to make moves in these studies, but when I could make moves for these studies I found that kings in groups of other kings could make moves that lone kings could not make, such as moving into check, and they could be captured. It seemed in Crazyhouse, that a captured king would not go into the hand of the one who captured it, and could not later be dropped.