Another bug found, but not sure if this is limited to the app:
In "Play Computer" in the app, the level 10 computer cannot castle, and when it tries to castle, it will take its own rook, and end up at the rook square. I have tested level 6, and it seems to castle properly.
Which app version did you use? Thank you!

Another bug found, but not sure if this is limited to the app:
In "Play Computer" in the app, the level 10 computer cannot castle, and when it tries to castle, it will take its own rook, and end up at the rook square. I have tested level 6, and it seems to castle properly.
Oh, weird... but thank you! We will check it!!