A few months ago I proposed the idea of an app making chess eBooks interactive
Now, I'm hosting a small private beta testing round of the app. Testing is nothing time consuming, everything should take at most several minutes but if you like you can play with it as long as you want.
How to join
Anybody who enjoys chess eBooks and is interested in taking part in beta testing, please email me or send a PM on Reddit.
This is how the app looks at the moment:
Update
So far 32 people signed up for the beta tests. I'm so excited for this!