We have a lot of couples that play in our home game. Most (but no all) of the time, the couples buy in together. Essentially, there is a stake being paid.
I track player performances and whether or not these couples win more when they are at the same table (possible collusion). Every player has a Partner Opposition Score. If you (or your partner win whenever you sit together, your Score goes up. The bigger the score, the bigger a POS you are, and the likelier you are to collude.
The onus is on me, as a host to make sure that
if there is possible collusion, that I bring it up (some might not know that soft-playing is wrong), and to do what I can to make sure those players do not start at the same table.
Funny, but sadly true story...
We had a couple that had a large POS rating. They would sometimes complain that they rarely or never got to sit at the same table. Over time their score began to drop.
@Mrs Poker Zombie was hesitant to let them sit together, because they were sill viewed as a collusion risk - even though the numbers indicated otherwise. The number continued to drop, and I felt secure is saying they were no longer colluding.
Last month the female half showed up alone. The guy had move out and they were filing for divorce.
Zombie records know all...