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Tough Sudoku for 22/March/2014

                 
                 
                 
                 
                 
                 
                 
                 
                 

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Sudoku Solving Techniques

Submitted by: sudoku lover

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everybody!

22/Mar/14 12:23 AM
'Let's say we fly south!'
22/Mar/14 12:50 AM
2 Singles ; UP25; NP(26)b56; UP36; HP(34-279)g13; NT(267)h45g6; LC(9gh2)-9ac2
#1. h4=6->g6=2;h9=9=g2,i2=6,c2=7=b8,c8=3,e8=6;g8=5=a9,a7=1; no solution for the digit 2! :=> h4=7; UP81

Interpretation :

#1a. 7c2=*[6h2=*HP(67-9)gi2=9h2-(9=6)h9] => 7c2=[6h2==6h9]
#1b. More...
22/Mar/14 3:30 AM
Great ski country !
22/Mar/14 3:56 AM
(26) 26@b56=>{bc4<>26,b3<>2,b8<>6}
(37) 15@gi5=>gi5<>7=>7@h45=>h79<>7
8?@i8=>{d7=8&i1=7=>[f3=7&c2=7=> g79=7]}=>i8<>8
(39) 7?@b3=>[d1=7=>d5=6&i3=2=>h5=2]=>b5={}=>b3<>7
(43) More...
22/Mar/14 7:05 AM
1. Note b56=26;g13=34.Unique possibilities to 36.
2. Whether b3=7=d1;OR b3=3,g3=4;i1=8 to avoid the 48 unresolvable rectangle @ ac15.UP39.
3. Whether i3=2;OR i3=7=c2,b3=3=c8,c3=2,c5=8,c1=4,c9=9=h2;h5=2.UP81.
22/Mar/14 7:24 AM
Standard techniques UP 36
1. Kraken column (2)h752 =>SIS 7c2=7f3=7i3 =>b3<>7 UP 40
||(2-8)h7=i8-(8=7)i1-gi2=(7)c2
||(2-7)h5=h4-e4=e8-f7=(7)f3
||(2)h2-(2=7)i3
2. SS (6)gi8=e8-e4=h4 =>h9<>6 UP 42
3. Kraken row (9)acd1 =>SIS 7f3=7e8=9f7 =>f7<>7 UP 81 More...
22/Mar/14 9:20 AM
Les's path in Eureka! :

#1. Wing[8d8=(8-7)d7=*Swordfish(7)-(7=8)i1]-8i8=8h7; UP38
where Swordfish(7) : XWing(b13,d1f3)=b8-de8=*f7-f3=f1
#2. Loop[(2=6)b5-(6=7)d5-7d1=7f3-(7=2)i3-2h2=2h5 @] :=> -6h5,-7d7,-7bc3=3b3,-2gi2; UP42
#3. SashimiXWing(6eh4,6egi8)-(6=9)h9; UP45
#4. ALS-XZ Rule[(2=8)a2-(8=672)c279]-(2=9)c3; UP81
22/Mar/14 6:10 PM
Hi Cenoman, didn't you miss to write down a step excluding 6d7 before #2 ?
Best Regards, JC.
22/Mar/14 6:11 PM
Hi JC,
right, I forgot the following step (eliminating 6d8, not 6d7...)
2a. (8)d8=i8-(8=7)i1-b1=b8-(7=6)e8 =>d8<>6 enabling then
2b. (6)gi8=e8-e4=h4 =>h9<>6
23/Mar/14 12:28 AM
Hi JC
what does
{Les's path in Eureka! :}
mean?
23/Mar/14 7:10 AM
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