Card Jitsu: Defeating Sensei

I just became a Ninja around 8:51 this morning, but the first 2 times I couldn't win. I already knew that Sensei could see your card when you picked it and he picks the one that beats it. But then I asked some other Ninjas, and they were no help. But then this girl came up and said, "I always use the low cards". She was on a red belt, so I thought that was no help. But I went and tried it, and it worked! So basically all you have to do is pick the low cards; if you have 2's DEFFINETLY use them, if you have 3's you should use them also. But if you do have a 2 you MUST MUST MUST use them. This only works when you have your black belt. You cannot defeat the Sensei any other way, good luck grasshopper.