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Fourth level Sudoku

Fourth level hard Sudoku puzzle 6, Strategies Techniques and Solution

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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

thumb_solve-hardness-level-4-sudoku-puzzle-5

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

thumb_solve-hardness-level-4-sudoku-puzzle-4.png

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 ...

Fourth level very hard Sudoku puzzle 3, Strategies Techniques and Solution

thumb_solve-hardness-level-4-sudoku-puzzle-3

This is the 3rd puzzle session at fourth level of hardness that is placed in 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 chained single digit locks is discovered and converted to a new technique first time. Solution of each step with strategies and techniques adopted explained fully ...

Hard fourth level Sudoku puzzle 2, Strategies Techniques and Solution

thumb_solve-hardness-level-4-sudoku-puzzle-2

This is the 2nd puzzle session at fourth level of hardness that is placed in very hard category. As expected, this is found to be a difficult puzzle with multiple bottlenecks to overcome even at late stages. Digit subset analysis, Cycles and digit lockdown techniques are the primary techniques and resources used for overcoming the bottlenecks. Solution of each step is explained fully with strategies and techniques adopted...

Hard fourth level Sudoku puzzle 1, Strategies Techniques and Solution

thumb_solve-hardness-level-4-sudoku-puzzle-1.png

This is the 1st puzzle session at fourth level of hardness that is supposed to be very hard. As expected, this is found to be a difficult puzzle with multiple bottlenecks to overcome even at late stages. Digit subset analysis, Cycles and digit lockdown techniques are the primary techniques and resources used for overcoming the bottlenecks. Solution of each step is explained fully...

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