A bishop and knight can also work together to secure a checkmate, though they may need a little more help to do it -- either from their own pieces, or from a few conveniently-placed defenders.
The diagram above shows a bishop and knight working together to trap a castled king. White's own pieces block most of his king's potential escape squares, while the well-placed Black bishop takes away g2 and h1. As White's king has no way to escape, a check by Black's knight will certainly spell the end for White.
Black finishes the game by playing Nh3++, checkmating the White king.
