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Different Methods of Playing Sudoku

From OnlineSoduku.com

Sudoku, a logic-based appointing puzzle, also known as Number Position, is more of a logic game where line of reasoning is requisite; both simple and complex in itself. The aim of this brainteaser is to fill squares that are empty on a panel or board with numbers 1 to 9. Every column, every row, and every 3x3 box called regions should have an exact appointed number only once, no repetition. Initial digits are given. At first, players would ponder how the heck they would correspond to all the digits in the column, row, or box, and how they would be able to assign a number to go here or there without causing disagreement with other numbers on the board. It is the positioning of the figures that makes this puzzle easy or hard.

   

There are different solution methods in understanding the Sudoku puzzle. A line of attack in solving this puzzle comprises a sequence of three processes: scanning, marking up, and assessment. Scanning is carried out in the beginning. This includes the process of elimination. Digits are scanned in order of their occurrence. All the numbers should be checked systematically by scanning the sections’ region, row, and column for values in order to see which is left as a possibility.

Marking up is a method used when no further digits can be determined by making candidate digits in the blank cells. Enlisting pencil dots in a single cell is a more likely way of putting it through. When candidate numbers are excluded, markings are then erased.

In assessment, there are two lines of approach, the what-if and candidate exclusion. In candidate exclusion, candidate digits are eliminated successively from cells to leave just one selection or choice. In what-if approach, a guess is made; only two candidate digits are designated. One cannot deny that tallying of regions, rows, and columns is pain in the eyes. In scripting candidate digits into unfilled cells can be time consuming and the what-if approach can be perplexing unless well thought-out.

With that regard, keeping track of moves in succession all out once is important. Of course there are three methods with varying degrees: The base methods that include the searching number method and ‘per cell’ method, and the ‘pencil mark’ method; advance methods that include the candidates reduction, the locked candidate (in a block, row, or column), the naked pair, triple, and quad, and the hidden pair and triple; extreme methods that include the X-wing, the swordfish, and the XY-wing.

In base method, one should start simply by inserting missing digits and examining particular rows and crossings with other blocks or columns. By using ‘pencil mark’ one would be able to recall remaining candidate digits presumed for that cell. With use of base method, one would be able to locate single exact number to be assigned. In advance method, relationships in between candidate digits in distinct cells were perceived. Finally, in extreme method, observed were the associations of the candidate digits beyond its particular region.

 
 

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