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All sudoku puzzles in this forum post are the intellectual property of Børge Alexander Tetlie Anderssen.
Copyright © 2009 Børge Alexander Tetlie Anderssen.  All rights reserved.  Terms of Use.

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

The difficulty levels explained     The ratings explained

A) Novice.
B) Apprentice (mainstream edition).
C) Master (61 Intersection, 4 Naked Pair, 1 Finned Swordfish on 2 in g4, 1 very late Y-Wing on 9 in g6). Select to view details.
The advanced techniques are needed in 2 different grids.

   Part 1 of mini-mini Walktrough (Finned Swordfish):

   Part 2 of mini-mini Walktrough (Y-Wing):

Regular Clueless Special #50A (Novice)

Rating based on required solving techniques:  Moderate

300007000000060000000000840670000500800000002000000010010030080090000020082600100
000000000000000001620085000090000700083000006000000080009018002000000090042700500
000000000670000009000063070000000001500000200008000500001000004000840100083500706
005000008000830076040700050007000000810000007000000090090000080000601032670300000
008004100070016800050000000000000000000000509803000000004000060030060078002430000
000060050700000030863400000500000000010000003900000002000030208047081060000000004
813000060700000100009027000040000007050000000000000300090002080000009206004300090
300050070000000000205690800030000006090000020010000009006000080708001900000080200
002000070500032000000800020823000000070000502000000000900080000740605903060003054



Regular Clueless Special #50B (Apprentice)

Rating based on required solving techniques:  Tough

300007000000460000000000840670000500000000002000000010010030080090001020082600100
000000000000000001620085000090000700083000006000000080009018002010000090042700500
000000000670000009000063070000000001500000200008000500001000004000840100083500706
005000008000030076040700050000000000810000007000000090000000080000600032670300000
008004100070016800050000000000000000000000509803000000004000060030060078002430000
000060050700000030863400000500000000010000003900000002000030208047001060000000004
813000060700000100009027000040000007050000000000000320090002080000009200004300090
300000070000000000205690800030000006090000020010000009006030000008001900000080200
002000070500032000000800020803000000070000502000000700900000000740605903060003054



Regular Clueless Special #50C (Master)

Rating based on required solving techniques:  Super Hard

300007000000460000000000840670000500000000002000000010010030080090000020082600100
000000000000000001620085000090000700083000006000000080009018002000000090042700500
000000000670000009000003070000000001500000200008000500001000004000840100083500706
005000008000830076040700050000000000810000007000000090090000080000600032670300000
008004100070016800050000000000000000000000509803000000004000060030060078002430000
000060050700000000863400000500000000010000003900000002000030208047001060000000004
813000060700000100009027000040000007050000008000000300090002080000009200004300090
300000070000000000205690800030000006090000020010000009006030000008001900000080200
002000070500032000000800020803000000070000502000000000900000000740605903060003054

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Quis custodiet ipsos custodes?

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While doing the Master, I was blocked but the Finned Swordfish explanation helped to move forward. I kept going until the end! never got a glimpse of the Y-wing. The part 2 and the "show" button did not help to locate it either.
It is a very good puzzle, thanks Børge.

_________________
Nothing can both be and not be

Hi Oscar,
long time no hear! It it is very good to hear from you again.
If I occasionally hadn't seen you online and from your profile could verify that you regularly are visiting, I would have feared that you had contracted "Ruud's Syndrome".

It is a real toughie, despite being a full Swordfish, i.e. 3 rows/columns with 2 or 3 cells in each, plus fin(s). And not one of those crippled ones (one or more rows/colums with one cell only) I have presented a couple of times.

Did you try the "Level 1 and Level 2 hints": Finned Swordfish on 2 in g4
before looking at the "Level 3 hint" (mini-mini Walktrough)?

If you reveal the cloaked digit, you know the digit and the technique, and have 10 grids to search.
If you reveal the cloaked grid, you know the grid and the technique, and have 9 digits to search.
If your reveal both the cloaked digit and the cloaked grid, you know technique, digit and grid, and then should hopefully be able to find it.

Strange! JSudoku insists that the Y-Wing is needed. Can it be that you accidentally have correctly eliminated a pencil marks, making the Y-Wing unneeded?

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Quis custodiet ipsos custodes?

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