93 ( +1 | -1 ) KBN vs. KThe process is somewhat involved. Basically, you have to drive the opponent's king into one of the two corners controlled by your bishop. To do this, you need to keep your three pieces relatively close together to create a barrier of inaccessable squares and force the opposing king towards any edge of the board. Then, the opposing king will race to the wrong corner (the corner not controlled by your bishop) so you'll then have to herd the opposing king to the correct corner, all the while keeping the king near the edge of the board. The final mating pattern is the opposing king in the corner controlled by your bishop and a line of knight closest to the edge, then king, then bishop delivering the final check to the king to produce the mate. For instance, if a Black king were on a1, then two of the mating patterns would be knight on c1, king on c2, bishop on c3, or knight on a3, king on b3, bishop on c3.