Uses of the knight

1. e4 c5 2. Bc4 e6 3. Nc3 Nf6 4. e5 Ng8 5. Nf3 Nc6 6. d3 Qc7 7. Bf4 Nge7 8. Nb5
Qd8 9. Nd6# 1-0

In this match you will see black playing defensive, while white punishes black for playing closed potions. 

Expand, develop with momentum and take advantage of a closed position.