Firstly, the bidding: in 500, you might bid just to “stay in”. In Bridge you may re-enter the bidding and therefore you can pass with impunity. “Pass” is one of the most useful calls bridge players have. The second difference is in the play: after the opening lead, one player (the “Dummy”) faces their cards, as in Open Misére. If you’ve defended well against Open Misére you’ll…