bol-fight.py

import random

def d6(): return random.randrange(6) + 1

def fight(heroes, rabbles):
    while heroes and rabbles:
        #print heroes, "vs", rabbles

        for h in heroes:
            foe = random.choice(rabbles)
            att = d6()+d6()
            dam = d6()+2
            if att == 12:
                random.shuffle(rabbles)
                rabbles = rabbles[dam:]
                if not rabbles: break
            elif att + h.a - foe.d >= 9:
                foe.lb -= dam
        rabbles = [r for r in rabbles if r.lb > 0]
        if not rabbles: break

        for r in rabbles:
            foe = random.choice(heroes)
            att = d6()+d6()
            dam = d6()+1
            if att == 12 or att + r.a - foe.d >= 9:
                dam -= d6()-1
                foe.lb -= dam
        heroes = [h for h in heroes if h.lb > 0]
        if not heroes: break
        
    return bool(heroes)

class Char:
    def __init__(self, a=0, d=0, lb=3):
        self.a, self.d, self.lb = a, d, lb
    
    def __repr__(self):
        return "%d" % self.lb

wins = 0
for i in range(1000):
    heroes = [Char(3, 2, 12) for _ in range(3)]
    rabbles = [Char(1) for _ in range(20)]
    wins += fight(heroes, rabbles)

print wins