Mate can only be forced in the corners of the same colour of the bishop and the 50 move rule applies so accuracy is at a premium. The technique is to drive the Black King to the edge of the Board and then to the right corner using the King and Knight to control the squares which the Bishop does not control.
1.Kb2
Kd3
2.Nc7
Kc4
3.Kc2
Kb4
4.Kd3
Ka5
5.Kc4
Ka4
6.Nd5
Ka5
7.Nb4
Ka4
8.Bb6
Ka3
9.Nd3
Ka4
10.Nc5+
Ka3
11.Kc3
Ka2
12.Kc2
Ka3
13.Ba5
Ka2
14.Bb4
Ka1
15.Nb3+
Ka2
16.Nc1+
Ka1
17.Bc3#
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