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| − | {{comic | + | {{ComicHeader|74|March 10, 2006}} |
| − | | number = 74 | |
| − | | date = March 10, 2006 | |
| − | | title = Su Doku
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| − | | image = su doku.jpg
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| − | | titletext = This one is from the Red Belt collection, of 'medium' difficulty
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| − | }} | |
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| − | ==Explanation==
| + | [[File:Su_doku.jpg]] |
| − | {{w|Sudoku|Su Doku}} (Japanese for "single number," and now usually written as "sudoku") is a type of number puzzle, in which the player must place digits in a matrix field in the correct arrangement, such that they do not repeat within given domains. The most common arrangement is a 9×9 grid subdivided into nine 3×3 grids, into which the nine non-zero digits of the normal decimal counting system must be inserted, with no digit being allowed to appear twice in a horizontal or vertical row or in each individual 3×3 grid. The number and combination of pre-filled squares determines the difficulty of the puzzle.
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| − | However, [[Randall Munroe|Randall]] presents a 2x2 {{w|binary}} sudoku puzzle which isn't subdivided. The joke is that the binary system has only two digits (0 and 1), and as a result binary sudoku puzzles would be trivially easy and thus pointless. The puzzle in the comic would be completed by filling 0 in the top-left and 1 in the bottom-left empty box. The only other possible grid would have the 0s and 1s swapped. This fulfills the criterion of having no repeated digits in any row, column or cell.
| + | == Image Text == |
| | + | This one is from the Red Belt collection, of 'medium' difficulty |
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| − | The title text appears to reference a series of published sudoku puzzle books called "Martial Arts Sudoku". The difficulty of each book is denoted by a martial arts belt color, with each color representing a certain skill level. A red belt is a rather high level, second only to the black belt. When applied to binary sudokus, a sudoku with one number given would be the most difficult one (though still trivial) and thus be a black belt. This sudoku has two numbers given, hence the medium red belt level.
| + | == Description == |
| | + | First off, a little background: [http://en.wikipedia.org/wiki/su_doku Su Doku] (Japanese for "Single number") is a kind of puzzle, in which the player must place numbers (usually 1-9) in a (9 by 9) matrix playfield in such a way that no number appears twice on a horizontal and vertical row, and in a region of nine numbers in said matrix. Depending on the number of pre-filled numbers, the difficulty increases as the possibilities widen. The image text refers to the “Red Belt”-collection, which is a series of extremely difficult puzzles. |
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| − | ==Transcript==
| + | Now to the joke: when you play binary Su Doku, you only end up with two numbers (0 and 1), thus creating a maximum playfield of 2 by 2. Even the “Red Belt” series therefore will be easy to solve, as you can see in the comic. |
| − | :[A square divided into 2×2 squares, the top-right one has an 1 in it, the bottom-right one has a 0, the two left ones are empty.] | |
| − | :Binary Su Doku
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| − | {{comic discussion}}
| + | [[Category:Comics|0074]] |
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| − | [[Category:Binary]] | |
| − | [[Category:Logic]]
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| − | [[Category:Math]]
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