Martial arts is just a special case of bidding. The first rule of bidding, and especially of martial arts, is to not be followed. You can comply with this rule only if you can deploy a square wave (e.g., a ship ‘zig-zagging’ in an attempt to evade submarine attack) on demand. Prime factorization is the great granddaddy of the square wave. If you can’t do prime factorization, you’re a sitting duck.