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tarek
 Post subject: Regular Samurai #82
PostPosted: Sun Nov 15, 2009 8:55 am 
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Regular Samurai #82A (Apprentice)
Rating based on required solving techniques:  Hard

Image
82A Line Format:
Code:
..4.7.......9...24..5.4..3..8.4.1.......9.8.1.13...6..13...8......3....25....4...
....4..6..7..1...91...75.....64..9........618.83..7......8.1......9...7.......8..
...6.......2.........27.....6...........3.8....1...9.5...1...4......3............
4...........9.4...72...5.......7.38...1..8...3.8....9....26.....1....9.....7..8.5
.4..7..2.......87....29....4.2..6.......2.5.9.5...4.3....3..2.6..47.9...1.8......


tarek
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Ed
 Post subject: Re: Regular Samurai #82
PostPosted: Sun Nov 22, 2009 4:58 am 
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Joined: Wed Apr 16, 2008 1:16 am
Posts: 1044
Location: Sydney, Australia
tarek wrote:
Regular Samurai #82A (Apprentice)
Well, it beat me. Nice one Tarek. Turns out it only takes SudokuSolver All Simpler (SSAS), especially a naked quad in G4:n7 Select to view details. to solve it! I don't know how many times I went over that area. Blind. ;) Still, really enjoyed trying.

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Ed
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tarek
 Post subject: Re: Regular Samurai #82
PostPosted: Sat Nov 28, 2009 2:27 pm 
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This is a suggested walkthrough:
Non single moves:
Code:
..4.7.......9...24..5.4..3..8.4.1.......9.8.1.13...6..13...8......3....25....4...
....4..6..7..1...91...75.....64..9........618.83..7......8.1......9...7.......8..
...6.......2.........27.....6...........3.8....1...9.5...1...4......3............
4...........9.4...72...5.......7.38...1..8...3.8....9....26.....1....9.....7..8.5
.4..7..2.......87....29....4.2..6.......2.5.9.5...4.3....3..2.6..47.9...1.8......

8 forms an intersection in g4b8/g4r8 [g4r8c1]<>8
4 forms an intersection in g3b7/g3r9 [g3r9c456]<>4
3 forms an intersection in g4r2/g4b1 [g4r1c23][g4r3c3]<>3
6 forms an intersection in g4b2/g4c4 [g4r456c4]<>6
7 forms an intersection in g3c8/g3b6 [g3r45c9]<>7
9 forms an intersection in g3b7/g3c3 [g3r45c3]<>9
5 forms an intersection in g4b8/g4r8 [g4r8c13]<>5
5 forms an intersection in g4c1/g4b4 [g4r4c23][g4r56c2]<>5
8 forms an intersection in g4r3/g4b2 [g4r1c45]<>8
2 forms an intersection in g3b7/g3r7 [g3r7c5]<>2
8 forms an intersection in g3b7/g3c3 [g3r4c3]<>8
1 forms an intersection in g4b6/g4c9 [g4r7c9]<>1
7 forms an intersection in g4b4/g4c2 [g4r7c2]<>7
26 is a hidden double in g4c6 [g4r4c6]<>1<>9 [g4r6c6]<>1
1 forms an intersection in g4c6/g4b8 [g4r9c5]<>1
26 is a hidden double in g3r9 [g3r9c5]<>5<>9 [g3r9c6]<>9
89 is a hidden double in g3r7 [g3r7c3]<>3 [g3r7c5]<>5
(x-wing g3c3c9/g3r4r9 [g3r4c8][g3r9c27]<>3 not needed)
457 is a hidden triple in g4b7 [g4r7c2]<>3<>9 [g4r7c3]<>3<>9 [g4r8c3]<>2<>6

Solution:
324175968871936524965842137789461253456293871213587649137628495648359712592714386
835249761274618359169375284516482937742593618983167542327851496658924173491736825
495618327712349658386275491963852174574931862821764935238197546657483219149526783
495617238183924657726835149569472381241398576378156492854269713617583924932741865
546178923219463875783295164492536718361827549857914632975341286624789351138652497
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