It's so obvious. Play 19 games against the CPU and you'll see the game always rolls the numbers that have the most CPU opponents on them. I've never seen so many 2 and 3s in my life. The dice rng system should never be a part of AI strategy. It's just pure laziness and it's frustrating than fun. Solution: Make the dice true rng. Never have the dice check the status of the AI. I don't recommend this game until they fix it. The multiplayer is busted so either wait for a patch that will probably never come, or move on to Catan Universe. Heck, even the .io versions have better AI.
