OOC: As far as I'm concerned, diagonally across a square may as well count as moving one square, I'm not going to quibble over a few feet here or there. So Shakou would have a stright line to, say #5 (I say without checking the map).
Diagonals
When measuring distance, the first diagonal counts as 1 square, the second counts as 2 squares, the third counts as 1, the fourth as 2, and so on.
You can’t move diagonally past a corner (even by taking a 5-foot step). You can move diagonally past a creature, even an opponent.
You can also move diagonally past other impassable obstacles, such as pits.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.