I remembered this cartoon by reading the problem:
I'll have to think how to incorporate the stabbing in the problem... :)
I have the feeling it's a cheat no ? We don't stay in the problem's definitions.
textbook solution, nice!
Remove any row in which a NaN appears
Flip the main diagonal of a matrix
Matrix indexing with two vectors of indices
Permute diagonal and antidiagonal
singularity 2.0 (hard)
Knave in the middle attack
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