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Regular Clueless Special #66
http://www.rcbroughton.co.uk/sudoku/forum/viewtopic.php?f=14&t=646		 Page 1 of 1
Author:  Børge [ Fri Nov 13, 2009 2:54 pm ]
Post subject:  Regular Clueless Special #66 
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 four difficulties to choose from.
All four puzzles have the same solution.
The difficulty levels explained     The ratings explained

A) Novice.
B) Apprentice (mainstream edition).
C) Junior Master (78 Intersection, 5 Naked Pair, 1 Naked Triplet, 1 Finned Swordfish on 2 in g1). Select to view details.
D) Master (78 Intersection, 5 Naked Pair, 4 Naked Triplet, 1 XY-Wing on 4 with pivot {39} in g8, 1 Two String Kite on 3 in g8). Select to view details.



Regular Clueless Special #66A (Novice)

Rating based on required solving techniques:  Moderate

Image

002007050700000009300050060007000005400000000010000040005000001000100008100004037
001000000002090004308001500000000030000000000027000805000050000400002300060009142
000030000001000900020050600003000000700000010090000008500008000300070006002000530
000070020001050000876200000000000400002000000300000900000040008200003009540006310
000070005049000800100006000060000000000000003300000200007004000000008059030700480
000008401000000006092040030000000500300000200010000000800200000003087009009000860
000460008004000009079500200400000120020000050090000000100005000000803741003007000
000000002005002601040005300000000008850000000006000000000000007600190200180000000
060850000000040029308000000020000003470000100000000070009000047004500600100080000



Regular Clueless Special #66B (Apprentice)

Rating based on required solving techniques:  Hard

Image

002007050700000009300050060007000005400000000010000040005000001000100008100004037
001000000002090004308001500000000030000000000027000805000050000400002300060009142
000030000001000900020050600003000000700000010090000008500008000300070006002000530
000070020001050000876200000000000400002000000300000900000040008200003009540006310
000070005049000800100006000060000000000000003300000200007004000000008059030700480
000008401000000006092040030000000500300000200010000000800200000003087009009000860
000460008004000009079500200400000100020000050090000000100000000000803741003007000
000000002005002601040005300000000008850000000006000000000000007600100200180000000
060850000000040029308000000020000003470000100000000070009000047004509600100080000



Regular Clueless Special #66C (Junior Master)

Rating based on required solving techniques:  Super Hard

Image

002007050700000009300050060007000005400000800010000040035000001000100008100004037
000000000002090004308001500000000030000000000027000805000000000400002300060009142
000030000001000900020050600003000000700000010090000000500008000300070006002000530
000000020001050080876200000000000400002000000300000900000040008200003009540006310
000070005049000800100006000060000000000000003300000200007004000000000059030700480
000008400000000006092040030900000500300000200010000080800200000003007009009000860
000460008004000009079500200000000100020000050090000000100000000000803041003007000
000000002005000601040005300000000008850000000006000000000200007600190200180000000
060050000000040029308000000020000003470000000000000270009000047004500600100080000



Regular Clueless Special #66D (Master)

Rating based on required solving techniques:  Super Hard

Image

002007050700000009300050060007000005400000000010000040005000001000100008100004037
000000000002090004308001500000000030000000000027000805000050000400002300060009142
000030000001000900020050600003000000700000010090000008500008000300070006002000530
000070020001050000876200000000000400002000000300000900000040008200003009540006310
000070005049000800100006000060000000000000003300000200007004000000000059030700480
000008401000000006092040030000000500300000200010000000800200000003007009009000860
000460008004000009079500200400000000020000050090000000100000000000803741003007000
000000002005002601040005300000000508850000000006000000000200017600190200180000000
060050000000040029308000000020000003470000100000000270009000047004500600100080000
Author:  Ed [ Sun Nov 15, 2009 5:50 am ]
Post subject:  Re: Regular Clueless Special #66
[edit: I couldn't solve this one and....] this is as much as I could find for this Master level puzzle. Hoping someone else can contribute something. Any takers? Thanks Børge for this puzzle.

Regular Clueless Special #66D (Master) - start of a WT (edit heading)
Hidden Text:
SudokuSolver All Simpler (SSAS). Download attached routine order to your computer then, Solver-Options-Import.

From SSAS
1. G3: weak links on 7s in r9, c7 & with n9 -> at least one of r1c7 and r9c2 must be 7 -> no 7 in r1c2

From SSAS
2. G3: no 6 in r9c1 becacause of 4s in n4. Like this.
2a. 4 in r6c1 -> r123c1 = {689} -> no 6 in r9c1
2b. 4 in r6c3 -> r78c3 = [69] -> no 6 in r9c1

Really enjoyed hunting around for multi-grid moves but didn't find anything. Hope someone else can!
Cheers
Ed

Attachments:
SSAS.solveroptions [1.74 KiB]
Downloaded 1062 times
Author:  Børge [ Wed Nov 18, 2009 2:49 pm ]
Post subject:  Re: Regular Clueless Special #66
Ed,
again thanks for a WT. :applause:

After having studied your WT carefully I am left confused. Is it supposed to solve the puzzle :scratch:
I am unable to get the puzzle solved using your WT.
Author:  Ed [ Fri Nov 20, 2009 8:12 am ]
Post subject:  Re: Regular Clueless Special #66
Børge wrote:
Is it supposed to solve the puzzle :scratch:
Unfortunately no! I've edited my previous post. Hopefully it's clearer now. I'd really like someone to work on the puzzle with me. Take 5 grids each perhaps. ;)

I'll contribute another one elimination(!), step 3 below. I've included the first bit from my previous post just to keep it together.
Hidden Text:
SudokuSolver All Simpler (SSAS). Download previously attached routine order to your computer then, Solver-Options-Import.

From SSAS
1. G3: weak links on 7s in r9, c7 & with n9 -> at least one of r1c7 and r9c2 must be 7 -> no 7 in r1c2

From SSAS
2. G3: no 6 in r9c1 because of 4s in n4. Like this.
2a. 4 in r6c1 -> r123c1 = {689} -> no 6 in r9c1
2b. 4 in r6c3 -> r78c3 = [69] -> no 6 in r9c1

New step
3. G4: no 4 in r2c6 because of 9's in n3: Like this.
3a. 9 in r3c8 -> r3c56 = [14] -> no 4 in r2c6
3b. 9 in r2c8 -> r2c1 = 4 -> no 4 in r2c6

Time to just focus on those cells/eliminations that would have a big result.
Cheers
Ed
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