rules of engagment for one shot

plain: 1-49 free, 50-89 enconter, 90-00 merchant
water: 1-33 free, 34-66 enconter, 67-90 merchant, 91-00 crocodile
rocks: 1-20 free, 21-60 enconter, 61-89 ambush, 90-00 merchant
forest: 1-33 free, 34-66 ambush, 67-90 ghost, 91-00 merchant
mountain: 1-10 free, 11-90 encounter (black), 91-00 merchant (wealthy)
modifiers: cliffs(near = birds, on = trecherous terrain)                 hills(near = targeted by reds, on = able to see reds)