5 and Dime poker rules

One down and one up, then three more up cards. One like-for-like exchange (declare Up/Down, then pick the card), then a simultaneous high-low declare. Both must win both ways.

Players: 2 to 8
Betting: Spread limit
Betting rounds: 6

How a hand of 5 and Dime goes

1
Deal
Each player gets 1 down and 1 up; a betting round.
2
3rd
Each player gets 1 up; a betting round.
3
4th
Each player gets 1 up; a betting round.
4
5th
Each player gets 1 up; a betting round.
5
Exchange
Each player declares Up, Down or Pass together, then picks the card to replace (like for like, up to 1); a betting round.
6
Declare
Everyone declares High, Low or Both at once; a betting round.

Who wins

The pot splits between the best declared high hand and the best declared ace-to-five low; a Both declarer must win both ways outright.

Everyone declares High, Low or Both at the same time. A Both declarer must win both ways outright; a tie on either side loses.