| Sudoku, or number placement, puzzles are
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| | has a number one as one of the given
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| sweeping the country. Even though the
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| | numbers. That means that the number one
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| game involves numbers, it is not
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| | you need to place must be located in the
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| mathematical. And people who feel they
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| | left or right cube. Instead of 9
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| don't have a good vocabulary will choose
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| | potential placements, you now have only
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| them in preference to crossword puzzles.
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| | 6.After you have determined all the
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| Soduku is nothing more than logic.Howard
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| | missing numbers, you will find that you
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| Gams is given credit for inventing the
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| | have many with two or three
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| puzzle in 1979. His puzzles never caught
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| | possibilities. Hopefully you will be able
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| on in this country but became an instant
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| | to write these possibilities in the
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| success in Japan. Now it is carried by
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| | squares. The best you can hope for is to
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| more newspapers than crossword
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| | have two contiguous squares with only two
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| puzzles.Soduku is a nine-by-nine cubical
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| | possibilities. In the top rank, squares
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| grid. When properly completed, each of
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| | one and two are either a six or an eight,
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| the rows and files will contain all the
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| | but you can't tell which. You still have
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| numbers between 1 and 9 as will each of
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| | learned a great deal of information
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| the 3 X 3 cubes comprising the whole. The
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| | because it means that those two numbers
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| puzzle will appear as a completed grid
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| | can't appear in any of the other empty
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| with certain numbers missing. When read
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| | squares across that rank. As I suggested
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| across and down, each of the three
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| | before, every time you find a "hard
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| contiguous inner cubes will have a
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| | number," one that cannot be placed
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| different digit in a different position.
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| | anywhere else, fill it in with
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| For our purposes we can designate these
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| | pen.Another way to come up with
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| rows as ranks and files. Ranks run
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| | information is to use the "what if"
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| horizontally across the puzzle and files,
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| | method of placing numbers. Let's say that
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| vertically. If, for example, the number
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| | you have a six in the second rank of the
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| one appears in rank 1 in cube one and
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| | small cube in the upper left corner. Even
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| rank 3 in cube 2, the third one must
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| | if you have no other information where
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| necessarily appear in the second rank in
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| | the other two 6s are located, you you
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| cube 3. This would seem to imply that it
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| | know that the other 6s must be in first
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| could appear in any of three positions in
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| | and third ranks. By placing it in the
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| the second rank, but most often, there
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| | first rank, you will then have to locate
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| will already be a number in one position,
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| | the last placement in the third rank of
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| leaving a choice of two possibilities.
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| | the remaining cube. By testing the
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| Let's assume you have a choice of two
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| | placements you will often run into a
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| positions.The next step is to check the
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| | contradiction in one of the ranks or
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| files. If by some chance a one appears in
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| | files. If you don't shrug your shoulders
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| one of the files of your choices, you now
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| | and try placing another number and see
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| know the numeral must be placed in the
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| | what happens.Kerep at it. Sooner or later
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| other. This simple cross check should be
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| | you will have filled in most of the
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| your first step in solving the puzzle.
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| | numbers. On more than one occasion I have
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| Anytime you find a HARD number, one you
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| | run into a contradicition on the very
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| have logically determined cannot be
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| | last number. There's nothing to do about
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| another, I recommend you write it in with
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| | it but back up and start again. Patience
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| a Pen. This will save unnecessary
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| | is the greatest skill required to solve
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| erasures when you make an inevitable
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| | thse puzzles.Sooner or later, you, your
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| mistake.Your second step should be to
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| | pencil the paper or the puzzle will call
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| scan each of the smaller cubes for their
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| | it quits. Let's hope it's the puzzle.John
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| missing numbers. Usually you will be able
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| | Anderson is addicted to puzzles in any of
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| to place one or two numbers by the
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| | their forms. They play a crucial role in
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| rank-file cross-checking. After you have
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| | his novel, The Cellini Masterpiece,
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| done that, read across each of the ranks
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| | written under the pen name of Raymond
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| and files to determine the missing
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| | John. If you have a question or comment
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| numbers. Let's say that you are missing a
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| | for John, please log on to You also may
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| number one in the top rank and you have
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| | read the first chapter of The Cellini
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| missing numbers in all of the smaller
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| | Masterpiece at the site.
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| cubes. Let's say that the middle cube
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|
