Is this the double duel or the guy with the Six Samurai Deck?

I used what i could muster into a spellcaster deck and basically tried to make sure he couldn't even get that first six samurai out with compulsory evac etc.

There really isn't a particular deck to fight him with. I followed my usual strategy for all Six Samurai Decks and got my opponent to attack my monsters and then I'd increase their attack so the attacker would get destroyed. I also use a lot of spell and trap cards to destroy them before he can get more than one on the field.

You have to gain hand advantage, which will yield field advantage soon enough, and then the win.

Buy one of better Structure Decks - the Spell Counter, Gemini or Machina Decks are some of the better options - then use passwords to get multiples of the best cards.

Make sure u have cards like botomless traphole and darkbribe and miror foce so wen u vs gushizawa or any 1 u can take em down + u could use a pierceing deck like saber beetlr strong wind dragon
hope this helps

The only chalenge is the boss isay ever use a fury from the deep improvement or a life point + deck cause of the 4000 point special rule.

The fury from the deep deck also works on the tag teams.