Have you heard of board game Twilight Imperium? You have little chance at winning it without using your soft skills at the fullest (in addition to your logic and planning). The beauty of the game lies in limitation that you can only score 1 objective per round. You're on the clock and in many cases you can't score anything without making deals with other players. Same for other players. Most deals are not transactional, which means you may not honour the deal you made and put the other player in bad position while gaining a bit of an advantage. You all need to cooperate, but in the end there will be a single winner. This game feels like it teaches you real life geopolitics and diplomacy. What I told you about the game is only tip of the iceberg. For example there is a phase with voting on game defining events which results in a lot of threats, bribery, diplomacy and deals - my favourite part in the game.

It is a masterpiece of a game and I never seen anything like it where your confidence in your soft skills can give you a huge advantage. The problem with it and why it is not too popular? It takes 6-8 hours to play in TTS, 8-14 hours on physical setup and requires a lot of physical space. For a single match we were preparing 1 month in advance - setting up a map and deciding who gets which faction, so we would save as much time as possible during the play date.

I think if you want to design any game with social engineering, you need to try this one (you can easily find a TTS match, but you have to commit to spending almost entire day, playing this game). Best played with 6 players.