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Tough Sudoku for 5/June/2014

                 
                 
                 
                 
                 
                 
                 
                 
                 

Choose a number, and place it in the grid above.

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Sudoku Solving Techniques

Submitted by: sudoku lover

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Strange... I dreamed the electrical wires were melting last night!
05/Jun/14 12:11 AM
Bev, how weird!! Why??
05/Jun/14 12:27 AM
SE=7.2 UP to 29
1)2-chain logic:(5)h8=(6)h6=(5)d6,(8)h4,(3)h5-d5=(3)d8 or (5)g8=(378)i2g13=(5)i3 => 8<>3,g4<>8,d3<>5
2)(8=1)g9=(8)f1=(9=8)d3-d9=(9)c9 => c9<>1 UP=81
05/Jun/14 1:44 AM
[(9=21)he3-1c3=(1-9)c9=9d9]-9d3
05/Jun/14 3:03 AM
X-32 ***: Symmetry=None, Start=24, SSTS=28, SG=33.25, SE=9.2
900040608000001500060009012006000000073000900008200006800150000000000037000403000

a rare SE=9.2 that is chainable! SG's first success at this level, although 10 krakens is OTP;
only 2 (closely related) krakens required 6.5 points.
05/Jun/14 5:23 AM
X-30 ***: (unsolved), SG=21.75, SE=9.1
000078100000501040081002000020105300000000070406000015000800009268003000300000000

an als loop and a gnarly DK for ice, a relatively tame SE=9.1 @(20 nets + 12 krakens)

// SS(2)eg3.gde4; -2e5

1. { More...
05/Jun/14 5:28 AM
X-24 **: (unsolved), SG=13.75, SE=9.0
067080300809007000230400000002000603700000058090000270500602800000013000000970000

// SS(9)f79e7.g75; -9f5
1. (69)e67=SS(5)c4b6.e67-(5=1)c7-(1=3)c3-c5=a4-(3=569)e467 # -6e58, -9e5

2. UR(23)de.58::(3)c5=*(2)d9-e8=e5 # -3e5

3. More...
05/Jun/14 5:33 AM
X-27 **: (unsolved), SG =12.75, SE=8.5
032000000400080000000703000085062090000000500000040830200400006009500000006000140

// CW(5)hb3.(1)b3a2.(8)ahi2; -8h3
// ext. SW(12)i5/(1)f58.c84,(2)b54; -1bd4.ab5

1. aals[(16=2)d89-(2=*17)ch8] - (1=9)f8-(9=7)f1-(7=5)b1 More...
05/Jun/14 5:36 AM
X-28 **: (unsolved), SG=12.0, SE=9.0
002705000800400000070080200008050001201000906500090400004010030000009007000503800

// xy: (3=6)e9-f78=f4-(6=3)b4-i4=g6 # 3bg9

// UR(28)bd.23::SS(2)dh6.he2*=i3; -2d3
1. UR(28)bd.23::(69=7)a3c1-(7=36)bc4* - (6=2)f4 - (2)d6=*b1 # -(69)b1
// More...
05/Jun/14 5:39 AM
(26) 34@ac6=>e6<>34
(27) 7@ef8=>a8<>7
(28) 68@b78=>b78<>5
(29) 29@h23=>h2<>345=>[4@h89=>i79<>4&37@ci2=>ic2<>145]
(30) More...
05/Jun/14 8:21 AM
Hi JC
(-9)he3 which results in (9)d9 => d3<>9 but (9)he3 which results in (9)d9 does not. It means that (-9)he3 results in (-9)d9.

05/Jun/14 10:15 AM
Hi JC. After d3=58, I can't see your next UP.

1. Note b78=68,e23=12,h23=29,ci2=37.Unique possibilities to 29.
2. Whether d3=5=h6=g8,a8=1;OR d3=8=g1,g9=1;OR d3=9=c9;c3=1.UP81.
05/Jun/14 8:24 PM
Hi Bud and Alfred,
d9=9 or c9=9(->ceh3=129) :=> NT(578)dgi3; i2=3,NT(168)i7gi9,hc9=49; singles to end.
Best Regards, JC.
05/Jun/14 10:09 PM
Thanks JC, that's very neat.

Best Regards, Alfred.
06/Jun/14 4:23 AM
A longer path:
X-27,SE=8.5
SSTS
1)(8)f3=(8-5)h3=i1-(57=8)ba1,=>df1<>8
2) (1): a4=a8-f8=f5,=>d4<>1
3) (2)e1=(2-3)d1=d6-(3=7)e5,=>e1<>7
4) Kaken:(1257)h8,=>e3<>7
(1)h8-(1=9)f8-(9=7)f1
||
(2)h8-d8=(2-3)d1=d6-(3=7)e5
||
(5)h8-( More...
06/Jun/14 6:28 PM
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