Castling is possible if king and rook were spawned on the standard chess positions and hadn’t moved (e.g. king on e1 and rook on a1)
Pawns move two squares from the second row only.
There is an option to save your setup (for registered users) and also option to set up for computer (in computer settings).
Tournament is a super idea, neat way to make a theory of setups:)
Awesome ideas with the initial position transcript and permalinks, we’ll work on the implementation!