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The original Amsler grid was black and white. A color version with a blue and yellow grid is more sensitive and can be used to test for a wide variety of visual pathway abnormalities, including those associated with the retina, the optic nerve , and the pituitary gland .
Most commonly, it consists of 64 squares (8×8) of alternating dark and light color, typically green and buff (official tournaments), black and red (consumer commercial), or black and white (printed diagrams).
These letters are combined with either "l" for Light=White, or "d" for Dark=Black. So "kl" is White's king, and "nd" is Black's knight. An empty square is written either using underscores, spaces, or nothing at all. Two spaces are recommended. <space> = empty square
Grid chess sample position. Grid chess is a chess variant invented by Walter Stead in 1953. [1] It is played on a grid board. This is a normal 64-square chessboard with a grid of lines further dividing it into larger squares. A single additional rule governs Grid chess: for a move to be legal, the piece moved must cross at least one grid line.
There are various systems for recording moves and referring to the squares of the chessboard; the standard contemporary system is algebraic notation. In algebraic notation, the files are identified by the letters a to h , from left to right from the white player's point of view, and the ranks by the numbers 1 to 8 , with 1 being closest to the ...
Check (also checker, Brit: chequer, or dicing) is a pattern of modified stripes consisting of crossed horizontal and vertical lines which form squares.The pattern typically contains two colours where a single checker (that is a single square within the check pattern) is surrounded on all four sides by a checker of a different colour.
The mutilated chessboard problem is an instance of domino tiling of grids and polyominoes, also known as "dimer models", a general class of problems whose study in statistical mechanics dates to the work of Ralph H. Fowler and George Stanley Rushbrooke in 1937. [1]
Grid systems started as helper lines for written books. Artists used grid systems to layout the content – text and images – in a manner that makes reading and absorption easier. Newspapers, books, magazines, and classifieds, etc., all use different grid systems that make the optimum use of space for better reading and presentation. [4]