I think adding time controls to this beatiful app would make it much more attractive.
Version 1.89: Thanks to some new checks, it is no longer possible to introduce certain illegal positions, such as those with, for example, nine white pawns. In previous versions, if you created such positions in edit mode, you could switch to play mode and make the program crash. The same checks are now applied to positions read from .fen files. In addition, there will no longer be crashes after an exit by means of the Back key, followed by a restart.
Download last version of Senior Chess from GOOGLE PLAY.