A K

I just started watching this show on Netflix last week. It is a very interesting show and I got hooked. I just finished season 6 episode 24 Boar Sword. The judges and host are very keen on details and knowledge. The final challenge for this episode, the blade was to have a minimum of 4 waves. When I looked at the winning weapon, I could only count 3 waves. Maybe I'm not counting the waves correctly. Did anyone else see this? If the winning weapon did not have the correct number of waves, was the correct winner ever given the recognition he deserved?