Fourth level Sudoku

Fourth level hard Sudoku puzzle 6, Strategies Techniques and Solution

Submitted by Atanu Chaudhuri on Wed, 22/04/2020 - 23:14

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This is the 6th puzzle session at fourth level of hardness of very hard category. This is a very hard puzzle with multiple bottlenecks to overcome right from the start. Valid DS evaluation for empty cells needs to be done early but in selected cells and limited to 3 digit long DSs. Cross-scan of row, column and 9 cell square, Digit subset analysis, Single digit lockdown and advanced use of Cycles provide the main breakthroughs. Solution of each step with strategies and techniques adopted are explained fully ...

Fourth level hard Sudoku puzzle 5, Strategies Techniques and Solution

Submitted by Atanu Chaudhuri on Tue, 21/04/2020 - 17:39

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This is the 5th puzzle session at fourth level of hardness of very hard category. This is a very hard puzzle with multiple bottlenecks to overcome right from the start. Valid DS evaluation for empty cells needs to be done early but in selected cells and limited to 3 digit long DSs. Cross-scan of row, column and 9 cell square, Digit subset analysis and advanced use of Cycles provide the main breakthroughs. Solution of each step with strategies and techniques adopted are explained fully ...

Fourth level hard Sudoku puzzle 4, Strategies Techniques and Solution

Submitted by Atanu Chaudhuri on Mon, 20/04/2020 - 16:15

This is the 4th puzzle session at fourth level of hardness of very hard category. This is found to be really a very hard puzzle with multiple bottlenecks to overcome right from the start. Valid Digit subset evaluation to a large extent needed to be done very early that indicates the hardness of the puzzle. Digit subset analysis, Cycles and digit lockdown techniques are the primary techniques and resources used for overcoming the bottlenecks. A new structure of multiple parallel scans is discovered and converted to a new technique for the first time. Solution of each step with strategies and techniques adopted explained fully ...

How to solve Sudoku hard level 4 game 3 by Sudoku Techniques

Submitted by Atanu Chaudhuri on Sun, 19/04/2020 - 00:20

thumb How to solve Sudoku hard level 4 game 3 by Sudoku Techniques

How to Solve Sudoku hard level 4 game 3 explains Sudoku techniques DSA, Cycle, Single digit lock, Possible digit enumeration and more. The game extra hard.

Sudoku Techniques - how to solve Sudoku hard level 4 game 2

Submitted by Atanu Chaudhuri on Sat, 18/04/2020 - 03:56

thumb Sudoku Techniques - How to solve Sudoku hard level 4 game 2

Sudoku Techniques - How to Solve Sudoku hard level 4 game 2 explains Sudoku techniques DSA, Cycle, Single digit lock. This is second game at level 4.

Hard fourth level Sudoku puzzle 1, Strategies Techniques and Solution

Submitted by Atanu Chaudhuri on Thu, 16/04/2020 - 01:07

thumb Sudoku hard Strategy and Techniques to Solve Sudoku hard level 4 game 1

Learn Sudoku hard strategy and techniques in solution to Sudoku hard level 4 game 1. Breakthroughs by DSA, Cycle, Single digit lock explained clearly.

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Fourth level Sudoku