OFC basic rules
Each player gets 13 cards arranged in 3 rows:
Top: 3 cards · Middle: 5 cards · Bottom: 5 cards.
Iron rule: top must be weaker than middle, middle weaker than bottom. Invalid arrangement (foul) = 0 points for the whole hand.
Open face: you get the first 5 cards to place, then one card per turn until 13. Everything is visible — opponents watch your arrangement live.