user10007: 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:
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?

user10810: That's either a bug or some non standard chess variant

10007: <p>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. </p>

<p>Black to move:</p>

<p><a href="https://i.stack.imgur.com/H5gGJ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/H5gGJ.jpg" alt="Black to move"></a></p>

<p>White to move (one move later):</p>

<p><img src="https://i.stack.imgur.com/4Dpeh.jpg" alt="White to move"></p>

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

<p><strong>Black moves <code>Rook on a8 to d8</code> and <code>Knight on g8 to f6</code> in the same move.</strong></p>

<p>Is this legal? Or is it just a bug in the system?</p>
 10810: <p>That's either a bug or some non standard chess variant</p>
