We play with this rule, so that one teammate can’t carry the other the whole game. The rule is, on the final cup, both players have to make a shot in the cup, before the cup has to be drank, and the other team goes into redemption. For instance, Player A makes every shot up to the final cup, he makes the final cup, and the game is normally put into redemption, with this rule, his partner then has to make his next shot to put into redemption. If Player B misses, the other team gets their turn as usual, and after their turn, Player B, gets to try again. This process goes on until one team can make the validation shot.
The one exc eption to the validation rule is, there isn’t a validation shot when a team is in redemption, only one partner needs to make the final cup in redemption.