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  2. Tetromino - Wikipedia

    en.wikipedia.org/wiki/Tetromino

    This is due to the T tetromino having either 3 dark squares and one light square, or 3 light squares and one dark square, while all other tetrominoes each have 2 dark squares and 2 light squares. Similarly, a 7×4 rectangle has 28 squares, containing 14 squares of each shade, but the set of one-sided tetrominoes has either 15 dark squares and ...

  3. Four color theorem - Wikipedia

    en.wikipedia.org/wiki/Four_color_theorem

    In graph-theoretic terms, the theorem states that for loopless planar graph, its chromatic number is ().. The intuitive statement of the four color theorem – "given any separation of a plane into contiguous regions, the regions can be colored using at most four colors so that no two adjacent regions have the same color" – needs to be interpreted appropriately to be correct.

  4. MacMahon Squares - Wikipedia

    en.wikipedia.org/wiki/MacMahon_Squares

    The goal is to arrange the squares into a 4 by 6 grid so that when two squares share an edge, the common edge is the same color in both squares. In 1964, a supercomputer was used to produce 12,261 solutions to the basic version of the MacMahon Squares puzzle, with a runtime of about 40 hours. [2]

  5. Nonogram - Wikipedia

    en.wikipedia.org/wiki/Nonogram

    There is only one unique way to link all the squares in a properly-constructed puzzle. When completed, the squares that have lines are filled; the contrast with the blank squares reveals the picture. (As above, colored versions exist that involving matching numbers of the same color.) Fill-a-Pix also uses a grid with numbers within. In this ...

  6. Chessboard - Wikipedia

    en.wikipedia.org/wiki/Chessboard

    It consists of 64 squares, 8 rows by 8 columns, on which the chess pieces are placed. It is square in shape and uses two colours of squares, one light and one dark, in a chequered pattern. During play, the board is oriented such that each player's near-right corner square is a light square.

  7. Homage to the Square - Wikipedia

    en.wikipedia.org/wiki/Homage_to_the_Square

    All of the paintings in the series show either three or four nested squares of color. The position of the interior squares is determined by a regular schema, with the margin below the square being smaller than the space above it. [5] The works range in size from 406 x 406 mm to 1.22 x 1.22 meters. [2]

  8. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. Mutilated chessboard problem - Wikipedia

    en.wikipedia.org/wiki/Mutilated_chessboard_problem

    A domino placed on the chessboard will always cover one white square and one black square. Therefore, any collection of dominoes placed on the board will cover equal numbers of squares of each color. But any two opposite squares have the same color: both black or both white. If they are removed, there will be fewer squares of that color and ...