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Sudoku Solving Techniques - Kristanix Games
www.kristanix.com
Solving a hard Sudoku puzzle will require quite a different set of techniques compared to an easy one. This article presents nine such techniques; ...
Sudoku techniques - Conceptis Puzzles
www.conceptispuzzles.com
Hard puzzles require deeper logic analysis which is done with the aid of pencilmarks. Sudoku pencilmarking is a systematic process writing small numbers inside ...
Sudoku Hard Strategy and Techniques level 4 game 1
suresolv.com
As a strategy we always try first—the row-column scan to find the valid cell at any stage. This is the most basic and easiest of all techniques.
How To Use Sudoku XY-Wing To Solve Difficult Sudoku
www.sudokuessentials.com
Sudoku XY-Wing can solve some of your most difficult Sudoku puzzles. ... If these terms are not familiar, read my article Sudoku Tips for an illustrative ...
6 Advanced Sudoku Strategies explained - SudokuOnline.io
www.sudokuonline.io
6 Advanced Sudoku Strategies explained · 1. The X-Wing · 2. The Swordfish · 3. Forcing Chains · 4. The XY-Wing · 5. Unique Rectangle Type 1 · 6. Nishio.
How to Solve Sudoku Puzzles of Any Difficulty - The Habitat
thehabitat.com
Because it is incredibly difficult to fill a Sudoku grid the first time ... It also enables many of the more complex Sudoku techniques.
Advanced Sudoku Solving Techniques and Tips
sudokusolver.com
This is a more difficult method, one of the most complicated for any Sudoku you will find in print. From today onwards, you will find the swordfish technique ...
Hard Level - 27 Givens - Step-by-Step Solution - Web Sudoku
www.websudoku.com
Every Sudoku puzzle we provide comes with its step-by-step solution, such as the hard example shown below. The step-by-step shows one way to solve puzzle ...
Killer Sudoku Tips and Strategies
www.killersudokuonline.com
Basic Solving Strategies · Rule of 1: This comes directly from the definition of sudoku. · Rule of Necessity: This rule can be applied to sudoku regions (i.e., ...
Sudoku Techniques – Sudoku of the Day
www.sudokuoftheday.com
Techniques For Solving Sudoku ... Sudoku is a puzzle involving logic – no arithmetic or guessing is required! The basic idea of completing puzzles is to find ...
Pin on Sudoku - Pinterest
www.pinterest.com
Dec 24, 2018 - Master these strategies and be an expert. ... Sudoku Tips : Learn How To Solve Sudoku Puzzles Hard Puzzles, Number Puzzles, Sudoku.
How to Solve a Sudoku - wikiHow
www.wikihow.com
sudoku solving techniques: With 4 Levels Difficulty Random ...
www.amazon.com
sudoku solving techniques: With 4 Levels Difficulty Random Easy Medium Hard Jumbo Sudoku Books For Adults 8.5x11Inch 255 Pages Puzzles Sudoku [world puzzles ...
Sudoku Techniques you can master
sudokuprimer.com
Sudoku Solving Techniques. Tips and tricks that help you solve more difficult puzzles. Introduction. This page lists different techniques you can use to ...
Guide to solving a hard, challenging Sudoku puzzle
www.sudokudragon.com
Using advanced strategies to solve a challenging puzzle solution step-by-step. a, b, c, d, e, f, g, h, i. A ...
Sudoku Assistant -- Solving Techniques - St. Olaf College
www.stolaf.edu
The Sudoku Assistant uses several techniques to solve a Sudoku puzzle: cross-hatch scanning, row/column range checking, subset elimination, grid analysis,and ...
Hard sudoku puzzles online - solve difficult web sudoku for free
sudoku.com
To solve hard level Sudoku puzzles, you should already know some tactics and tricks. Popular methods and techniques for solving hard web Sudoku. Print difficult ...
The Ultimate Sudoku Strategy Guide | Learn all the Tricks
bestofsudoku.com
Learn all the tips and secrets to up your sudoku game! ... Because the puzzles are partially filled it can be difficult to make the first move.
Advanced techniques and sudoku strategy
minimindgames.com
Advanced Sudoku techniques, sudoku puzzles. ... can solve about 70%, medium difficulty just over 10% and difficult about 5% of all Sudoku puzzles.
Sudoku Tips: Advanced Ghosting, Tagging & Line Checking
www.memory-improvement-tips.com
Sudoku Tips: Solving a Hard Puzzle. Welcome to Part 3, the third and final part of my Sudoku Instructions. On this page, we will cover more situations using ...
Solving Sudoku - Angus Johnson
www.angusj.com
Rules and hints for solving Sudoku puzzles. ... The following techniques are no more difficult than those above but requires observation as to how specific ...
How to Solve Sudoku Faster: Beginner Techniques - Airship ...
www.airshipman.com
Focus on only one part of a square, row, or column rather than worrying about the entire grid all in one go. Slowly work your way up until you ...
Advanced Techniques - Learn Sudoku
www.learn-sudoku.com
Advanced Techniques. A Quick Warning… At this point, you have learned all the basic Sudoku concepts. And while understanding them is certainly no easy task, ...
Techniques for improving : r/sudoku - Reddit
www.reddit.com
12 votes, 12 comments. Hey guys, Ive been doing lots of difficult Sudoku puzzles and having difficulty after getting to the stage when ...
Are there published Sudoku puzzles that require guessing?
puzzling.stackexchange.com
Instead, a handful of techniques could be used to solve the puzzle completely, including the hard puzzles. Are there published puzzles out there that do require ...
Sudoku solving algorithms - Wikipedia
en.wikipedia.org
A standard Sudoku contains 81 cells, in a 9×9 grid, and has 9 boxes, each box being the intersection of the first, middle, or last 3 rows, and the first, ...
Learn Sudoku Strategies - Thonky.com
www.thonky.com
Learn strategies to help you solve even the most difficult sudoku puzzles.
How to solve sudoku puzzles @ paulspages.co.uk
www.paulspages.co.uk
Guide to solving sudoku puzzles. ... The solving techniques needed for more difficult puzzles all depend on having an accurate list of the possible numbers ...
The Math Behind Sudoku: Solving Strategy - Department of ...
pi.math.cornell.edu
The most basic strategy to solve a Sudoku puzzle is to first write down, in each empty cell, all possible entries that will not contradict the One Rule with ...
How to solve sudoku - Solving sudoku strategies - Sudoku 9981
www.sudoku9981.com
Solving Sudoku Strategy - Single Digit Patterns ... Two parallel strong links, weakly connected at the base. ... Two crossing strong links, weakly connected in a ...
Sudoku Solving Tactics
www.sudokuslam.com
However, the more difficult puzzles on Sudoku Slam have been designed to require more cleverness. ... This technique can be applied more generally.
Killer Sudoku Strategy Tips - Puzzle Books
www.puzzle-book.co.uk
Rules of Killer Sudoku · Place the numbers 1 - 9 once in each region · The regions are the 9 columns, 9 rows and 9 3x3 bold-lined boxes · Ensure that the numbers ...
sudoku hard tips - Tripping Up Trump
www.trippinguptrump.co.uk
sudoku hard tips. Pinterest. Cells each take a number between 1 and 9. The Basic Basics/scanning. 5 steps to solve a Sudoku Puzzle.
400+ Sudoku Puzzle Book : Easy to Very Hard ... - Walmart
www.walmart.com
Buy 400+ Sudoku Puzzle Book : Easy to Very Hard Puzzles - Including Solving Techniques and Solutions (Paperback) at Walmart.com.
how to solve a hard sudoku - complete description - Solsarin
solsarin.com
What is the technique to solve Sudoku? There are more than a few techniques to solve a Sudoku puzzle, but per Conceptis Puzzles, the easiest way ...
Tips and Methods for Solving Sudoku Puzzles
www.sudoku129.com
A sudoku puzzle comprises 9 rows, 9 columns and 9 block. Each of them must contain all numbers from 1 to 9. The following concepts are there to help you ...
Solve Extreme Sudoku: Strategies for Easy to Hard Puzzles
www.barnesandnoble.com
After a short discussion of Sudoku and presentation of tools in Section 1, this book gives a review of standard techniques or strategies to ...
Hidden Subsets (Hidden Pair, Hidden Triple, Hidden Quadruple)
hodoku.sourceforge.net
Solving Techniques for sudoku - Hidden Pair, Hidden Triple, Hidden Quadruple. ... It is very hard to spot them without using pencil marks. Sudoku technique: ...
(PDF) Techniques for Solving Sudoku Puzzles - ResearchGate
www.researchgate.net
Sudoku puzzles, one of the most popular pastimes in the world. One could make the. same points with more serious applications, but it is hard to imagine a ...
Sudoku Solving Techniques - Kristanix Games
www.kristanix.com
Solving a hard Sudoku puzzle will require quite a different set of techniques compared to an easy one. This article presents nine such techniques; ...
Sudoku techniques - Conceptis Puzzles
www.conceptispuzzles.com
Analyzing techniques. As Sudoku puzzle levels get harder you will find the simple scanning methods described above are not enough and more sophisticated solving ...
How To Use Sudoku XY-Wing To Solve Difficult Sudoku
www.sudokuessentials.com
Sudoku XY-Wing can solve some of your most difficult Sudoku puzzles. This illustrative article will help you identify and solve Sudoku successfully.
Medium and Hard Sudoku Solving Tips With Sample Videos
hobbylark.com
Good solvers have suggested all kinds of practical tips that have helped them. Some say to use only pen; some say to use only pencil; one ...
Sudoku Hard Strategy and Techniques level 4 game 1
suresolv.com
Sudoku hard Strategy and techniques for easy solution ... As a strategy we always try first—the row-column scan to find the valid cell at any ...
How to Solve Sudoku Puzzles of Any Difficulty - The Habitat
thehabitat.com
Easier puzzles will have fewer blank spaces while harder puzzles will have ... It also enables many of the more complex Sudoku techniques.
6 Advanced Sudoku Strategies explained - SudokuOnline.io
www.sudokuonline.io
6 Advanced Sudoku Strategies explained · 1. The X-Wing · 2. The Swordfish · 3. Forcing Chains · 4. The XY-Wing · 5. Unique Rectangle Type 1 · 6. Nishio.
Advanced Sudoku Solving Techniques and Tips
sudokusolver.com
This is a more difficult method, one of the most complicated for any Sudoku you will find in print. From today onwards, you will find the swordfish technique ...
Hard Level - 27 Givens - Step-by-Step Solution - Web Sudoku
www.websudoku.com
Every Sudoku puzzle we provide comes with its step-by-step solution, such as the hard example shown below. The step-by-step shows one way to solve puzzle ...
Guide to solving a hard, challenging Sudoku puzzle
www.sudokudragon.com
Using advanced strategies to solve a challenging puzzle solution step-by-step. a, b, c, d, e, f, g, h, i. A ...
How to Solve Hard Sudoku Puzzles - wikiHow
www.wikihow.com
1 Use a pencil. · 2 Note potential candidates in open squares. · 3 Scan the board to process the puzzle. · 4 Start with the obvious singles. · 5 ...
Sudoku Techniques you can master
sudokuprimer.com
Thanks in advance for your support! Sudoku Solving Techniques. Tips and tricks that help you solve more difficult puzzles. Introduction. This page lists ...
Hard sudoku puzzles online - solve difficult web sudoku for ...
sudoku.com
To solve hard level Sudoku puzzles, you should already know some tactics and tricks. Popular methods and techniques for solving hard web Sudoku. Print difficult ...
Sudoku Solving Techniques: Aaron, Sam - Amazon.com
www.amazon.com
For solvers already able to complete puzzles graded as Easy or Moderate, but who find themselves up against a brick wall when faced with more difficult puzzles, ...
The Ultimate Sudoku Strategy Guide | Learn all the Tricks
bestofsudoku.com
Starting your puzzle is sometimes a key part of making sure you solve the whole thing in the end. Because the puzzles are partially filled it can be difficult ...
Sudoku Assistant -- Solving Techniques - St. Olaf College
www.stolaf.edu
Grid Analysis examples. Other advanced techniques are required to solve more difficult Sudoku puzzles such as this one. These techniques are based on one of the ...
Pin on Sudoku - Pinterest
www.pinterest.com
Dec 24, 2018 - Master these strategies and be an expert. ... Upgrade Your Skills in Sudoku: Medium and Hard Sudoku Solving Tips With Sample Videos.
Killer Sudoku Tips and Strategies
www.killersudokuonline.com
Killer Sudoku Solving Strategies. There are three basic methods used to solving killer sudoku puzzles. The first is to use the strategies for solving regular ...
The Math Behind Sudoku: Solving Strategy - Department ...
pi.math.cornell.edu
The most basic strategy to solve a Sudoku puzzle is to first write down, in each empty cell, all possible entries that will not contradict the One Rule with ...
Sudoku Tips: Advanced Ghosting, Tagging & Line Checking
www.memory-improvement-tips.com
Sudoku Tips: Solving a Hard Puzzle. Welcome to Part 3, the third and final part of my Sudoku Instructions. On this page, we will cover more situations using ...
Solving Sudoku - Angus Johnson
www.angusj.com
Rules and hints for solving Sudoku puzzles. ... The following techniques are no more difficult than those above but requires observation as to how specific ...
Advanced Techniques - Learn Sudoku
www.learn-sudoku.com
And while understanding them is certainly no easy task, you have probably realized by now that finding them in puzzles can be even harder.
How to Solve Sudoku Faster: Beginner Techniques - Airship ...
www.airshipman.com
Focus on only one part of a square, row, or column rather than worrying about the entire grid all in one go. Slowly work your way up until you ...
Are there published Sudoku puzzles that require guessing?
puzzling.stackexchange.com
Instead, a handful of techniques could be used to solve the puzzle completely, including the hard puzzles. Are there published puzzles out there that do require ...
how to solve a hard sudoku - complete description - Solsarin
solsarin.com
What is the technique to solve Sudoku? There are more than a few techniques to solve a Sudoku puzzle, but per Conceptis Puzzles, the easiest way ...
How to solve sudoku puzzles @ paulspages.co.uk
www.paulspages.co.uk
Guide to solving sudoku puzzles. ... The solving techniques needed for more difficult puzzles all depend on having an accurate list of the possible numbers ...
Learn Sudoku Strategies - Thonky.com
www.thonky.com
Learn strategies to help you solve even the most difficult sudoku puzzles.
What is a good time for a hard Sudoku? - MVOrganizing
www.mvorganizing.org
How do you solve difficult Sudoku levels? ... Use the first few techniques to insert as many numbers as you can. Then, when you can add no more ...
How to solve hard Sudoku puzzles
minimindgames.com
Here are the most common techniques to solve hard Sudokus. X-wing. X-wing. If a candidate appears in two columns (rows) in exactly ...
Solve Extreme Sudoku: Strategies for Easy to Hard Puzzles
www.barnesandnoble.com
After a short discussion of Sudoku and presentation of tools in Section 1, this book gives a review of standard techniques or strategies to ...
Sudoku Solving Tactics
www.sudokuslam.com
However, the more difficult puzzles on Sudoku Slam have been designed to require more cleverness. ... This technique can be applied more generally.
Sudoku solving algorithms - Wikipedia
en.wikipedia.org
Although it has been established that approximately 5.96 x 1126 final grids exist, a brute force algorithm can be a practical method to solve Sudoku puzzles ...
400+ Sudoku Puzzle Book : Easy to Very Hard ... - Walmart
www.walmart.com
Buy 400+ Sudoku Puzzle Book : Easy to Very Hard Puzzles - Including Solving Techniques and Solutions (Paperback) at Walmart.com.
Solve Sudoku Technique, Forcing Chain - 俄亥俄新聞OHIO ...
www.ohiochineseamericannews.com
When you solve a hard Sudoku puzzle, forcing chain method can help you determine exactly what number a certain empty square must hold.
Sudoku: advanced techniques - Idle Analytics
www.idleanalytics.com
Sudoku puzzles are classified according to their difficulty. My old newspaper, the LA Times, did so as Gentle, Moderate, Tough, ...
How to Solve Extremely Hard Sudoku Puzzles Step by Step
sudoku9x9.com
Expert Area: More Extremely Difficult Sudoku Puzzles. Exit from Expert Area. Solve Sudoku Puzzle Step by Step. (L6: #734928687).
Hidden Subsets (Hidden Pair, Hidden Triple, Hidden Quadruple)
hodoku.sourceforge.net
Solving Techniques for sudoku - Hidden Pair, Hidden Triple, Hidden Quadruple. ... It is very hard to spot them without using pencil marks. Sudoku technique: ...
Solving Hard Sudoku - Kappa Puzzles
kappapuzzles.com
Sometimes applying the standard solving techniques to a difficult sudoku puzzle can lead you to an apparent impasse. No matter how hard you try, ...
Sudoku Solving Techniques - Kristanix Games
www.kristanix.com
Solving a hard Sudoku puzzle will require quite a different set of techniques compared to an easy one. This article presents nine such techniques; ...
Sudoku techniques - Conceptis Puzzles
www.conceptispuzzles.com
Hard puzzles require deeper logic analysis which is done with the aid of pencilmarks. Sudoku pencilmarking is a systematic process writing small numbers inside ...
Sudoku Hard Strategy and Techniques level 4 game 1
suresolv.com
As a strategy we always try first—the row-column scan to find the valid cell at any stage. This is the most basic and easiest of all techniques.
How To Use Sudoku XY-Wing To Solve Difficult Sudoku
www.sudokuessentials.com
Sudoku XY-Wing can solve some of your most difficult Sudoku puzzles. ... If these terms are not familiar, read my article Sudoku Tips for an illustrative ...
6 Advanced Sudoku Strategies explained - SudokuOnline.io
www.sudokuonline.io
6 Advanced Sudoku Strategies explained · 1. The X-Wing · 2. The Swordfish · 3. Forcing Chains · 4. The XY-Wing · 5. Unique Rectangle Type 1 · 6. Nishio.
How to Solve Sudoku Puzzles of Any Difficulty - The Habitat
thehabitat.com
Because it is incredibly difficult to fill a Sudoku grid the first time ... It also enables many of the more complex Sudoku techniques.
Advanced Sudoku Solving Techniques and Tips
sudokusolver.com
This is a more difficult method, one of the most complicated for any Sudoku you will find in print. From today onwards, you will find the swordfish technique ...
Hard Level - 27 Givens - Step-by-Step Solution - Web Sudoku
www.websudoku.com
Every Sudoku puzzle we provide comes with its step-by-step solution, such as the hard example shown below. The step-by-step shows one way to solve puzzle ...
Killer Sudoku Tips and Strategies
www.killersudokuonline.com
Basic Solving Strategies · Rule of 1: This comes directly from the definition of sudoku. · Rule of Necessity: This rule can be applied to sudoku regions (i.e., ...
Sudoku Techniques – Sudoku of the Day
www.sudokuoftheday.com
Techniques For Solving Sudoku ... Sudoku is a puzzle involving logic – no arithmetic or guessing is required! The basic idea of completing puzzles is to find ...
Pin on Sudoku - Pinterest
www.pinterest.com
Dec 24, 2018 - Master these strategies and be an expert. ... Sudoku Tips : Learn How To Solve Sudoku Puzzles Hard Puzzles, Number Puzzles, Sudoku.
How to Solve a Sudoku - wikiHow
www.wikihow.com
sudoku solving techniques: With 4 Levels Difficulty Random ...
www.amazon.com
sudoku solving techniques: With 4 Levels Difficulty Random Easy Medium Hard Jumbo Sudoku Books For Adults 8.5x11Inch 255 Pages Puzzles Sudoku [world puzzles ...
Sudoku Techniques you can master
sudokuprimer.com
Sudoku Solving Techniques. Tips and tricks that help you solve more difficult puzzles. Introduction. This page lists different techniques you can use to ...
Guide to solving a hard, challenging Sudoku puzzle
www.sudokudragon.com
Using advanced strategies to solve a challenging puzzle solution step-by-step. a, b, c, d, e, f, g, h, i. A ...
Sudoku Assistant -- Solving Techniques - St. Olaf College
www.stolaf.edu
The Sudoku Assistant uses several techniques to solve a Sudoku puzzle: cross-hatch scanning, row/column range checking, subset elimination, grid analysis,and ...
Hard sudoku puzzles online - solve difficult web sudoku for free
sudoku.com
To solve hard level Sudoku puzzles, you should already know some tactics and tricks. Popular methods and techniques for solving hard web Sudoku. Print difficult ...
The Ultimate Sudoku Strategy Guide | Learn all the Tricks
bestofsudoku.com
Learn all the tips and secrets to up your sudoku game! ... Because the puzzles are partially filled it can be difficult to make the first move.
Advanced techniques and sudoku strategy
minimindgames.com
Advanced Sudoku techniques, sudoku puzzles. ... can solve about 70%, medium difficulty just over 10% and difficult about 5% of all Sudoku puzzles.
Sudoku Tips: Advanced Ghosting, Tagging & Line Checking
www.memory-improvement-tips.com
Sudoku Tips: Solving a Hard Puzzle. Welcome to Part 3, the third and final part of my Sudoku Instructions. On this page, we will cover more situations using ...
Solving Sudoku - Angus Johnson
www.angusj.com
Rules and hints for solving Sudoku puzzles. ... The following techniques are no more difficult than those above but requires observation as to how specific ...
How to Solve Sudoku Faster: Beginner Techniques - Airship ...
www.airshipman.com
Focus on only one part of a square, row, or column rather than worrying about the entire grid all in one go. Slowly work your way up until you ...
Advanced Techniques - Learn Sudoku
www.learn-sudoku.com
Advanced Techniques. A Quick Warning… At this point, you have learned all the basic Sudoku concepts. And while understanding them is certainly no easy task, ...
Techniques for improving : r/sudoku - Reddit
www.reddit.com
12 votes, 12 comments. Hey guys, Ive been doing lots of difficult Sudoku puzzles and having difficulty after getting to the stage when ...
Are there published Sudoku puzzles that require guessing?
puzzling.stackexchange.com
Instead, a handful of techniques could be used to solve the puzzle completely, including the hard puzzles. Are there published puzzles out there that do require ...
Sudoku solving algorithms - Wikipedia
en.wikipedia.org
A standard Sudoku contains 81 cells, in a 9×9 grid, and has 9 boxes, each box being the intersection of the first, middle, or last 3 rows, and the first, ...
Learn Sudoku Strategies - Thonky.com
www.thonky.com
Learn strategies to help you solve even the most difficult sudoku puzzles.
How to solve sudoku puzzles @ paulspages.co.uk
www.paulspages.co.uk
Guide to solving sudoku puzzles. ... The solving techniques needed for more difficult puzzles all depend on having an accurate list of the possible numbers ...
The Math Behind Sudoku: Solving Strategy - Department of ...
pi.math.cornell.edu
The most basic strategy to solve a Sudoku puzzle is to first write down, in each empty cell, all possible entries that will not contradict the One Rule with ...
How to solve sudoku - Solving sudoku strategies - Sudoku 9981
www.sudoku9981.com
Solving Sudoku Strategy - Single Digit Patterns ... Two parallel strong links, weakly connected at the base. ... Two crossing strong links, weakly connected in a ...
Sudoku Solving Tactics
www.sudokuslam.com
However, the more difficult puzzles on Sudoku Slam have been designed to require more cleverness. ... This technique can be applied more generally.
Killer Sudoku Strategy Tips - Puzzle Books
www.puzzle-book.co.uk
Rules of Killer Sudoku · Place the numbers 1 - 9 once in each region · The regions are the 9 columns, 9 rows and 9 3x3 bold-lined boxes · Ensure that the numbers ...
sudoku hard tips - Tripping Up Trump
www.trippinguptrump.co.uk
sudoku hard tips. Pinterest. Cells each take a number between 1 and 9. The Basic Basics/scanning. 5 steps to solve a Sudoku Puzzle.
400+ Sudoku Puzzle Book : Easy to Very Hard ... - Walmart
www.walmart.com
Buy 400+ Sudoku Puzzle Book : Easy to Very Hard Puzzles - Including Solving Techniques and Solutions (Paperback) at Walmart.com.
how to solve a hard sudoku - complete description - Solsarin
solsarin.com
What is the technique to solve Sudoku? There are more than a few techniques to solve a Sudoku puzzle, but per Conceptis Puzzles, the easiest way ...
Tips and Methods for Solving Sudoku Puzzles
www.sudoku129.com
A sudoku puzzle comprises 9 rows, 9 columns and 9 block. Each of them must contain all numbers from 1 to 9. The following concepts are there to help you ...
Solve Extreme Sudoku: Strategies for Easy to Hard Puzzles
www.barnesandnoble.com
After a short discussion of Sudoku and presentation of tools in Section 1, this book gives a review of standard techniques or strategies to ...
Hidden Subsets (Hidden Pair, Hidden Triple, Hidden Quadruple)
hodoku.sourceforge.net
Solving Techniques for sudoku - Hidden Pair, Hidden Triple, Hidden Quadruple. ... It is very hard to spot them without using pencil marks. Sudoku technique: ...
(PDF) Techniques for Solving Sudoku Puzzles - ResearchGate
www.researchgate.net
Sudoku puzzles, one of the most popular pastimes in the world. One could make the. same points with more serious applications, but it is hard to imagine a ...