How do you castle on this app?

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xnmhbux
You can castle in traditional chess. When castling the king and the rook move simultaneously, the king moving two spaces either to the right or the left and the rook moving to the space immediately beside the king on the opposite side. Three rules of criteria; neither piece can have moved previously, there can be no pieces in between them and none of the spaces or pieces moving can be threatened by an opponent piece. How do you castle on this app?? Is there a button or a setting I am unaware of? Every time I try the board won't let me. Very frustrated, please help :/
BlargDragon

I haven't used the app in a long time, but you should just need to drag the king to the square he'd land on and the rook should move to the other side automatically.

hairhorn

Yes, just move the king to where it should go and the rook will sort itself out. 

Note though that the rook can pass through threatened squares in castling. 

hairhorn

... note also that the app won't let you castle if you don't meet the conditions for castling. 

CharlotteTheta

NICE

m_connors

Sounds right, move the King, the Rook will follow automatically.