chess board

1)
a chess board
is labelled from nos 1 - 64
a term is defined as the score of labelling
score of a particular labelling is the largest difference b/w 2 labels in squares sharing a common side or vertex.
what is smallest possible score?

2)imagine u live on newly settled moon. one day u see a no. 14 bus. the no. on the bus represents the route it takes, whch r numbrd sequentially frm 1.
what is most probable no. of bus routes?
(ans = 14)