saeco: he resigned the game and lost a gammon. how is it not an example for the possibility to do just that?

If you had agreed with me then there would have been no query but you agreed with nabla who qualified what I said with the claim that backgammon gets lost if there's still contact. It thus seemed as if you were saying that you had an example where backgammon was awarded.

Frankly I'd be surprised if there a contact-derived backgammon . I don't think BrainKing does that and I don't agree with nabla that it should do that either. If you've escaped your opponent's home then a backgammon is very unlikley. It's by no means guaranteed even with 4 men on the bar. I think the number of generously awarded backgammons simply because there's contact would far outweight any lost points from players who might have won a backgammon but only get a gammon.