A newly translated samurai text called "Twelve Rules of the Sword" reveals the secrets of a sword-fighting school that mastered a technique that seemed to give supernatural powers.
Dating back to the 17th century, the text contains knowledge passed down from a samurai named It? Itt?sai (born around 1560), who fought and won 33 duels in Japan. Researchers aren't sure when he died, but historical records suggest he may have lived to be over age 90. Itt?sai never wrote down his "Twelve Rules of the Sword," and instead passed them on orally to his students at the One Cut sword-fighting school. The descendants of his students later recorded them in writing.
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