This is my first question on chess beta and I don't know if I'm insane or if the cpu is broken. So I was playing chess against a CPU on the iPhone with the app 3D Chess Game, and the CPU (playing black) made an odd move.
Black to move:
White to move (one move later):
I obviously edited this to simplify it, but the basic idea is same. That is:
Rook on a8 to d8 and
Knight on g8 to f6 in the same move.
Is this legal? Or is it just a bug in the system?