Again, we're looking for the minimum number of keys possible. For example, I cannot get Q, W and S to register at the same time on my Model M.
A more important combo for me is W,R,F or W,E,D. None of those work either. I can hit any two keys, but I cannot hit any third key. Some third keys would work, others would not. Because the minimum number of keys I am guaranteed to be able to hit at any time is two, the board is 2KRO.
No screenshots because Linux (no aquakt), and because it doesn't illustrate anything -- I can't show what isn't happening, right?