The basic rules of the trick-taking game Stichtag are straightforward: Each player starts with twelve cards in hand, red is trump, and players want to collect the most tricks to win. However, the game includes a desk calendar with three flippable stacks of cards: two for the numerals in the date and one for the month. Each combination of cards corresponds to a different day of the year, giving you 366 game variants — or even more should you wish to play on March 38...