(a)
(b)
(c)
(d)
Figure 4: Green tilts illustrate the movement range of a swordsman, whose movement point is 2. The movement cost of each tilt is 1. (a) No obstacle. (b) Tilt is an obstacle and thus tilt is out of the movement range. (c) The swordsman cannot pass the enemy to reach tilt . (d) The swordsman can pass units of the same side to reach tilt .