right from the start, he had a good relationship with diplomacy; I thought it might be possible to surrender, but I started building up garrisons, and I didn't rely on it. At level 16, he took diplomacy, and after a few turns, an expert diplomat reached level 21. He added a few soldiers, took the utopia, and the opponent was left with an army and no money for a ransom. GG.
Thank you for the game!
