Imagination is vital virtue in the chess. Let me give you example: Imagine please the game "Hunter" vs Mobidi: 1.e4 d5 2.ed Nf6 3.d4 N:d5 4.c4 Nb4 5.Qa4+ N8c6 6.d5
Does hunter hunted the knight? Do you imagining the position? What posibilities black player have?
Now look at this :
Hunter became the victim. Enjoy :) http://www.youtube.com/watch?v=-b7qaSxuZUg