when Rugen returned, he was only willing to pay one tenth of the price (one fiftieth in the novel) he had promised. When Domingo refused to sell it to him and declared Inigo the rightful owner, he stabbed Inigo's father through the heart. Inigo, witnessing this, challenged Rugen to a duel, which he lost. Inigo then dedicated the next ten years to the study of fencing, studying under all of the greatest masters of the time. That way, when would meet again, he wouldn't lose. When he meets Count Rugen again, he tells him, "Hello, my name is Inigo Montoya. You killed my father. Prepare to die."
Inigo is a wizard (The rank above master) of the sword, and although he is right-handed, he is also very proficient at fencing with his left hand.