Difficult Sudoku puzzles to solve
Puzzles that require some of the more complex strategies to be solved.List of contributions in 'Difficult Puzzles to Solve'
| Difficult Puzzles to Solve contributed by Alexander |
| I've been musing about what makes a particular Sudoku puzzle easy or difficult to solve. I read somewhere that it is not simply a function of the number or pattern of the initial set of squares to be solved. I can see that that is at least partly true, so what is the answer? My own observation is that puzzles with empty regions (blocks of nine squares) are tricky. Also if there are only a few (two or less) occurrences of a number in the whole grid then that makes it difficult too. What are your experiences?
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| Submit1136 (re: Difficult Puzzles to Solve) contributed by Lynne |
| Some people reckon that a random reveal pattern of the Sudoku squares makes for a more difficult puzzle. I am not so sure. It's often symmetric patterns that give rise to pairs of symbols that you cant work out which one should be allocated. A random pattern tends to give irregularities in the grid that can often lead to some simple squares to solve.
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| Difficult possibilities (re: Difficult Puzzles to Solve) contributed by Alexander |
| It is the distribution of possibilities that make a puzzle difficult. Often it is a challenging when there are only one of two places for a number already allocated and lots of possibilities remain. This is when you tend to need the X-Wing and Swordfish strategies to be able to solve it. If the number of possible squares for a number is small then that makes it simpler to solve.
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Any comments ? Other threads in this forum
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Cycles and Twins
Possibility Question
Is placing the correct candidates part of logic? (2745)
Is Sudoku a game Of mathematical symmetry?
Stripes
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Trial and Error - The Labyrinth
Two out of three lines
X-Wing
Online Forums
Advice and Suggestions for using SudokuDragon
Big Grid
General Discussion about anything related to Sudoku
Help and advice on contributed Sudoku puzzles
Solution Strategies and Tips for Sudoku
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