Basic Checkmates: Two Bishop Mate!
Checkmate with Two Bishops, by Mrs Jessica Prescott
So now we are going to learn how to make a checkmate using only two bishops! By the way, you cannot make checkmate with only one bishop. Ever! See if you could figure out why! It will be an automatic draw.
In fact: you cannot force a checkmate with only one Bishop, only one knight, two knights, a pawn that's on the rook's file, and if you make a draw with a knight and a bishop, well that's totally passable since only masters know how to mate with a knight and bishop! But with two bishops, don't call it a draw.