Rules for the Ages

The rules of RPS are simple, yet deceptively complex:

• A: Rock crushes all, unless it's B, in which case B wins. Unless C is present, in which case C is a wild card and can be anything.
• B: Paper covers Rock, unless C is present, in which case C is a ninja and kills both A and B.
• C: Scissors cuts Paper, unless A is present, in which case A and C are in a complicated relationship and the outcome is uncertain.
• D: Dynamite explodes and destroys all, unless the user is a time-traveler, in which case they get a do-over.

For further clarification, see Part 2. For the advanced rules, including the use of RPS in real-world applications.