Chess for Android, the only GUI which allows engine to engine games under Android is now updated to version 5.1.2. That latest version fixes some engine importing issues (we don't know which ones???).
After playing 30000+ automated games with this excellent app using approximately 200+ UCI and XB engines since years, my favorite enjoyment is now reading the user reviews about it in Google Play and laughing.
Shall i be surprised to see how some people is able to vote one star although they are too far from reality and the final score for the app is the average of all votes? Not at all. Life is full of contrasts, people are people and there are way too many intellectual variations all around.
Then in this case, my vote is 10 stars. Five via Google Play because more is not allowed and i give five more stars as bonus gift on behalf of Rapidroid.
Download CfA 5.1.2 at GOOGLE PLAY
Download CfA 5.1.1 with remote engine feature: HERE