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  2. Four fours - Wikipedia

    en.wikipedia.org/wiki/Four_fours

    Four fours. Four fours is a mathematical puzzle, the goal of which is to find the simplest mathematical expression for every whole number from 0 to some maximum, using only common mathematical symbols and the digit four. No other digit is allowed. Most versions of the puzzle require that each expression have exactly four fours, but some ...

  3. Pedro (card game) - Wikipedia

    en.wikipedia.org/wiki/Pedro_(card_game)

    Pedro is an American trick-taking card game of the all fours family based on auction pitch. Its most popular variant is known as cinch, double Pedro or high five which was developed in Denver, Colorado, around 1885 [1] and soon regarded as the most important American member of the all fours family. Although it went out of fashion with the rise ...

  4. Pitch (card game) - Wikipedia

    en.wikipedia.org/wiki/Pitch_(card_game)

    The pub game played nowadays in northern England under the name all fours is a four-player partnership version of pitch, played for 11 points. Side payments are made for winning all four points in a single hand. In some areas the point for low is awarded to the eventual owner. Choosing the trump suit by leading to the first trick is known as ...

  5. All fours (card game) - Wikipedia

    en.wikipedia.org/wiki/All_Fours_(card_game)

    All fours is a traditional English card game, once popular in pubs and taverns as well as among the gentry, that flourished as a gambling game until the end of the 19th century. It is a trick-taking card game that was originally designed for two players, but developed variants for more players. According to Charles Cotton, the game originated ...

  6. Cinch (card game) - Wikipedia

    en.wikipedia.org/wiki/Cinch_(card_game)

    Cinch, also known as Double Pedro or High Five, is an American trick-taking card game of the all fours family derived from Auction Pitch via Pedro. [1] Developed in Denver, Colorado in the 1880s, [2] it was soon regarded as the most important member of the all fours family in the USA, but went out of fashion with the rise of Auction Bridge. [3]

  7. Ma Nishtana - Wikipedia

    en.wikipedia.org/wiki/Ma_Nishtana

    The four questions are traditionally asked by the youngest person at the table that is able to do so. [8] Much of the seder is designed to fulfill the biblical obligation to tell the story to one's children, [ 9 ] and many of the customs that have developed around the Four Questions are designed to pique a child's curiosity about what is ...

  8. Four color theorem - Wikipedia

    en.wikipedia.org/wiki/Four_color_theorem

    A four-colored map of the states of the United States (ignoring lakes and oceans) In mathematics, the four color theorem, or the four color map theorem, states that no more than four colors are required to color the regions of any map so that no two adjacent regions have the same color. Adjacent means that two regions share a common boundary of ...

  9. Connect Four - Wikipedia

    en.wikipedia.org/wiki/Connect_Four

    6+. Connect Four (also known as Connect 4, Four Up, Plot Four, Find Four, Captain's Mistress, Four in a Row, Drop Four, and Gravitrips in the Soviet Union) is a game in which the players choose a color and then take turns dropping colored tokens into a six-row, seven-column vertically suspended grid. The pieces fall straight down, occupying the ...