Complex nested loops- matrix indexing

I have a 20x20 matrix, I need to move some elements from a starting index i.e. (6, 3) to an ending index i.e. (17,2) to a new 12x2 matrix in this case.

Answer 1

[Bruno Luong]

A=randi(10,20,20) % some tes matrix, replace it with yours

B = A(6:1:17, 3:-1:2)