Well it doesn't matter how many times you fight him but you can get lucky and win the fight. That's the only legitimate way to beat him.
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You do the same in card-jitsu fire
because he is a card jitsu master
Beating sensei is really hard, you have to be fast. I suggest putting your computer in low resolution mode.
just keep playing him if you have your black belt, he will eventually let you win.
a new door will open next year it will be ice or water but in the mean time try to be a fire ninja