Knight's Challenge in D

[Tower Ty]

Interesting 

Your access array is as so
const int[8][8] access=[
	[2, 4, 6, 6, 6, 6, 4, 2],
	[4, 6, 8, 8, 8, 8, 6, 4],
	[6, 6, 8, 8, 8, 8, 6, 6],
	[6, 6, 8, 8, 8, 8, 6, 6],
	[6, 6, 8, 8, 8, 8, 6, 6],
	[6, 6, 8, 8, 8, 8, 6, 6],
	[4, 6, 8, 8, 8, 8, 6, 4],
	[2, 4, 6, 6, 6, 6, 4, 2]

Just taking the first line which explains the side squares of the board I can only see 3 legal moves on each tile you show 4 , and 4 on each tile you show 6. So what am I not seeing ?