How to (ethically) get that bishop badge?
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Well this still isn’t super ethical but go on live chess and click on unrated lower rated challenges, and keep your bishop pair the entire game so you can mate with two bishops, or promote to two bishops and do two bishops mate. This should be easier to do against lower rated players.
promote pawn to bishop - smart move 
I don't pay much attention to my badges, but I noticed I missed a "mate with bishop" badge. I have the queen, rook and pawn ones.
Obviously stuff like asking to play an unrated From's Gambit mate (f4 e5 fxe5 d6 ed Bxd6 Nc3 Qh4+ g3 Qxg3+ hg Bxg3#) is really, really unethical.
So my question is, what sort of moves, openings and time controls can I choose to make it more probable I can mate with a bishop? Sadly, around my rating, people resign rather than play a game out. So that makes it harder to, say, make an almost-stalemate trap and move in for a bishop check. (I suppose I could purposefully get low on time to give my opponent false hope so they play the game out, but again, that's unethical.)
It occurs to me that open games would give the best chance, as would a French Exchange or something where rooks and queens get traded on open files.
I figure I'll get this badge eventually, but I was wondering what would boost the chances naturally/ethically.