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Yugi figured out how to use the monster he summoned. It had no attack points because its used for the purpose of helping the dungeon master as its sword or shield. At first Yugi uses the shield ability to protect his dungeon master from Ryuji's attack and then he uses the sword to attack and kill Ryuji's monster. Now Ryuji doesn't have a monster that is strong enough to kill Yugi's dungeon master so long as Yugi keeps his monster alive. It's time for Yugi to finish this game.