The game is called ‘Rikken’. It’s played in parts of the Netherlands and Belgium. It has some resemblance with Bridge.
You have a bidding phase and a playing phase. There are several game types (numbers of tricks to win, trump, teams 1 vs 3 or 2 vs 2).
So all by all , it’s quite a challenge.
Right now I’m trying to understand and learn from your code at mcts_cardgame/ppo_witches_v4.py at master · CesMak/mcts_cardgame · GitHub