Very helpful. Thanks for the contribution to Chess education.
All of the chess programs by chess king are great!
app is locked
* Invert board option is replaced by on-board gesture
* Added "Auto next" option - automatically switch to the next exercise
* Added UCI engine support
* Added ability to navigate through lesson using swipe gestures on notation
* Added chess symbols convention
* Added "Copy PGN" option
* Added "Clear statistics" option
* Improved current theme and subtheme storing
* Various fixes and improvements