SudokuSolver Forum

There are four difficulties to choose from.
All four puzzles have the same solution.

A) Novice.
B) Apprentice (mainstream edition).
C) Grand Master (33 Intersections, 3 Naked Pairs, 3 Naked Triplets, 1 Naked Quad, 1 Hidden Pair, 1 Hidden Triplet, 4 XY-Wings: two in g2 and two in g3, 1 Y-Wing in g3). Select to view GRID numbers.
The advanced techniques are needed in 2 different grids.
D) Chief Wizard. Solvable using logic only? JSudoku needs 1 Recursively Solve, which makes 6 guesses and traverses 12513 nodes.



Regular Samurai #31A (Novice)

Rating based on required solving techniques:  Moderate

004008070000002001009300800000009000030050014802000006007000000000070000200600000
000002000000030090700050000001700000000500004050960103000006900000104700090000080
000020000000000000000600090900070300200000080400906007000007000000009000000800000
000000000010000000048093000000070009003001400500200000000020000080040600000050018
000090004000000000000203006000020000400730090800000407002480000003000060100000702



Regular Samurai #31B (Apprentice)

Rating based on required solving techniques:  Very Hard

004008070080002000009300800000009000030050014002000006007000000400070000200600000
000002600500000090700050000001700000000500004000960103000006900000104000000000080
000025000000000000000600000900000300200000080400906000000400000000009700000800000
000000000010000000000593000000070009003001400500200000070028000080040600000000010
000090050700000000000003006000020000000730090800000407002480000003000060100000702



Regular Samurai #31C (Grand Master)

Rating based on required solving techniques:  Super Hard

004008070080002000009300800000009000030050014002000006007000000400070000200600000
000002600500000090700050000001700000000500004000960103000006900000004000090000080
000025000000000000000600090900072300200000080400906007000400000000009000000800000
000000000010000000000593000000070009003001400500200000070028000080040600000000010
000090050000000000000003006000020000000730090800000407002480000003000060100000702



Regular Samurai #31D (Chief Wizard)

11 Naked Singles
39 Hidden Singles
34 Intersections
1 Naked Pairs
1 Naked Quads
1 XY-Wings
1 XYZ-Wings
1 Y-Wings
4 XY-X-Chains up to 3 links
8 XY-X-Chains
2 Grouped XY-Chains up to 3 links
8 Grouped XY-Chains
1 Hidden Unique Rectangle
1 ALS-XZ up to 5 cells
1 ALS-XZ
1 Recursively Solve: Unique solution found with 6 guesses, 12.513 nodes traversed

Rating based on required solving techniques:  Hellish Nightmare   Solvable using logic only?

004008070080002000009300800000009000030050014002000006007000000400070000000600000
000002600500000090700050000001700000000500004000960103000006900000004000000000080
000025000000000000000600000900072300200000080400906007000400000000009700000800000
000000000010000000000593000000070009003001400500200000070028000080040600000000010
000090050700000000000003006000020000000730090800000407002480000003000060100000702

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Here a mini-mini Walktrough of the #31B (Apprentice) puzzle.

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Quis custodiet ipsos custodes?

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