Risk Battle Simulator

A command-line utility to simulate Risk battles and compute probable outcomes.

Usage

Simulation Mode

risk sim <num_attackers> <num_defenders>

Simulates a single Risk battle between <num_attackers> attacking armies and <num_defenders> defending armies.

Example:

$ risk sim 7 3
simulating battle with 7 attackers vs. 3 defenders
results:
attacker loses 1 armies
defender loses 3 armies
attacker wins

Probability Mode

risk prob <num_attackers> <num_defenders> <runs>

Computes probabilities for all possible outcomes of a Risk battle between <num_attackers> attacking armies and <num_defenders> defending armies using <runs> test runs.

Example:

$ risk prob 7 3 100000
calculating probabilities for 7 attackers vs. 3 defenders using 100000 runs
results:
attacker wins:
armies lost | probability | cumulative
  0            24.7%         24.7%
  1            20.6%         45.2%
  2            17.5%         62.7%
  3            13.2%         75.9%
  4             8.7%         84.6%
  5             4.4%         89.0%
  6             2.0%         91.0%
defender wins:
armies lost | probability | cumulative
  0             1.9%          1.9%
  1             4.3%          6.1%
  2             2.8%          9.0%