Rex Turn 1: Rex Normal Summons Fire Ant Ascator (700/1300) in Attack mode. He then sets a card.
Roman Turn 2: Roman activates the Field Spell Spider Web. Now when a non-Insect type monster Rex controls attacks, it is switched to Defensive mode at the end of the Damage Step and it can't change its Battle Position until the End Phase of Rex's next turn while Spider Web is face-up on the field. He then Special Summons Dark Tuner Spider Cocoon (0/0) in Attack mode as Rex controls monsters, but Roman doesn't. Roman then Normal Summons Dark Spider (0/0) in Attack mode. He then activates Double Summon to allow himself to Normal Summon twice this turn. Roman then tributes both his Spider Monsters in order to Tribute Summon Earthbound Immortal Uru (3000/3000) in Attack mode. Earthbound Immortal Uru attacks directly via its own effect, but Rex activates his face down Attack Guidance Armor to his Fire Ant Ascator, so it's destroyed (Rex LP: 4000 -> 1700).
Rex Turn 3: Rex activates Pot of Greed to draw 2 cards from his Deck. Since Rex controls no monsters while his opponent controls monsters, he Special Summons Oracle of the Sun (1000/2000) in Attack mode. He then activates Soul Charge to Special Summon his Fire Ant Ascator from his GY to the field in Attack mode, at the cost of not being allowed to use the Summoned monsters for attacking this turn. Rex also takes 500 damage for each monster that he Special Summoned this way (Rex LP: 1700 -> 1200). Rex tunes Oracle of the Sun with Fire Ant Ascator in order to Synchro Summon Sun Dragon Inti (3000/2800) in Attack mode. He then activates Mystical Space Typhoon to destroy Spider Web, without a Field Spell Uru has its effects negated. Dragon Inti attacks Uru since they have the same attack points they destroy each other.
Roman Turn 4: Roman activates Double Spell, sending a Spell in his hand to the GY to activate the effect of a Spell in Rex's GY as his own. He selects Monster Reborn and uses it to Special Summon his Uru back to the field in Attack mode. Uru attacks Rex directly (Rex LP: 1200 -> 0). Roman wins.
(Keep in mind that Rex lost this Duel on purpose, to be reborn as a Dark Signer, so his moves wouldn't make that much sense if he was actually trying, but he wasn't).
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Yugioh Off-Screen Duels
RandomThese are my ideas about what happened in the Duels in any of the Yugioh Series that we didn't get to see. For example, Aster(Edo) v.s. Yusho in Arc V. Or Yuma's friends Dueling the 7 Barian Emperors in episode 124 to 125 of Zexal. This is just for...