It’s the worst case scenario for queens, of course. Just as you ask how to mate the solitary black king with the white king and a white rook in 2D chess. The mating method should always work.
If it doesn’t always work, which means that there is a position from where the mate isn’t possible … then that number of queens isn’t the answer we are looking for.
It’s the worst case scenario for queens, of course. Just as you ask how to mate the solitary black king with the white king and a white rook in 2D chess. The mating method should always work.
If it doesn’t always work, which means that there is a position from where the mate isn’t possible … then that number of queens isn’t the answer we are looking for.
To answer the other question: there exists a checkmate with two queens. Just pin the king into a corner with one, and guard that queen with another.
But can you actually pin a noncooperative king there with only 2 queens? You can in 2D, but hardly in 3D and even less in 4D.