Monopoly

Since most of the revenue earned by my empolyer comes from Candy Crush, a lot of swag around the office is somehow related. Very understandable, that.

This time we all got a Monopoly-game, but not the regular one everybody has been playing. Ok, to be entirely clear on this, threre are a minimum of 37 different language editions of the game, so in which country you spent your childhood, make it depend which streets the game you used to play has. Anyway, this is the Candy Crush -edition of Monopoly:

Also very understandably we did discuss different aspects of the game, one of them being about the winning tactics.

I started thinking, if it would be possible to just go to The Net and get some source code for a Monopoly-simulator and try to program some rules to a bot, which would then play against other bots and see which approach would be more likely to win in the long run.

Quite easily, I found a Python-version of the game by Juan Manuel Contreras from GitHub. Unfortunately, the work by him is quite unfinished, so I chose to fork it and continue from that point. I didn't touch the .py-files, only the Jupyter notebook -version of the game.

As a result of some weekend coding, I have:

• Class for user game logic
• Lots of game functionality, moving around, collecting rent, buying, selling, going bankrupt
• Winning the game

The resulting notebook is quite bug-free, but there are still some game rules, that aren't properly followed. Especially the situation where a player defaults, all the assets need to go to creditor. If creditor is another player, then to that, if bank, there needs to be an auction where other players may purchase the defaulting user's properties. Doing auctions between AI-players is not that easy, so none of that is implemented.

The same AI-module would be needed in a situation where a player lands on an unowned property. According to rules, that needs to be auctioned if the player doesn't want to buy it. Not so easy to do with Python.

Also, the Chance-cards are not implemented, so it is impossible to get a Get-out-of-jail -card. Yet.

By running the game in the sim for couple hundred times, I found that with 5 players, it is very likely to get into a situation where nobody can build houses/hotels. Also, if there are not many houses/hotels, the other players are unlikely to land on those properties and the game will run forever with all players accumulating wealth indefinitely. To get around that, I'm detecting such a situction and artificially doubling rents. That rule is not in the original Monopoly-rules. How human players would solve this situation is to trade/barter properties between each other to gain building rights. A thing not so easy to implement with any programming language.

That Python Monopoly -project was just a fun thing to do. I'm not sure if I'll continue it any further. The code is out there, if you're interested.