Witcher Viper Fangs

viper.py

from dragn.dice import D6, D10

def explode() -> int:
    roll = D10()
    if roll == 10:
        return roll + explode()
    else:
        return roll

def rolld10() -> int:
    roll = D10()
    if roll == 10:  # Critical
        return roll + explode()
    elif roll == 1:  # Fumble
        return roll - explode()
    else:
        return roll

REF = 11  # witcher REF
small_blades = 6  # skill in small blades
WA = 2 # weapon accuracy

bandit_ref = 6
bandit_dodge = 4

def sample():
    attack = REF + small_blades + rolld10() + WA
    dc = bandit_ref + bandit_dodge + rolld10()
    success = attack > dc
    return success

iterations = 100000
count = 0
for n in range(iterations):
    result = sample()
    if result:
        count += 1

print(f"{count / float(iterations) * 100:.0f}%")