This week we take a deeper look at the Japanese martial art of kendo. Martial artist and kendo expert Alex Bennett explains the intricacies of scoring an ippon. We also reveal the depth and subtleties of the exam that evaluates candidates for kendo's highest rank of 8th dan, which with its pass rate of less than 1% is considered the most difficult exam of any kind in Japan. We introduce kendoka hoping to reach the elusive grade, a lifelong challenge for many.