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:

Black to move

White to move (one move later):

White to move

I obviously edited this to simplify it, but the basic idea is same. That is:

Black moves 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?

  • 6
    It's busted unless you accidentally moved a piece or are playing in with a set of alternate rules.
    – Tony Ennis
    May 30, 2016 at 14:57

1 Answer 1


That's either a bug or some non standard chess variant

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