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Tough Sudoku for 29/April/2018

                 
                 
                 
                 
                 
                 
                 
                 
                 

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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Basics to 24
1. (8)ac8=(8-3)h8=g9-g2=(3-6)b2=(6-8)c1=(8)c78 =>-8b7
2. Loop (362)bgi2=(2-4)g3=(436)bgi2@ =>-89b2, -9gi2, -379g3; basics to 81
Note -8b2 is the efficient elimination in step #2
29/Apr/18 1:16 AM
SE=8.5
Basics to UP=24
1)(8)c87=(8-6)c1=(6-3)b2=g2-g9=(3-8)h8=(8)gh7,=>b7<>8
2)(8):b5=b2-c1=e1,=>e5< >8
3)(2)i2=(2-5)i4=i6-(5=8)a6-ef6=ef4-(68=2)hg4,=>i4<>2.UP=81
29/Apr/18 2:12 AM
1. Unique possibilities to 24.
2. Whether b2=3,c1=6,a2=8;OR g2=3=h8,gh7=8,g3i2=24,b2=6;b5=8.UP81.
(Note adef2=1489).
29/Apr/18 3:44 AM
Ignoring Basics (& X-wings)
#25 5?@i6=>b5=5=>a6=8=>79@df6=>e5=8=>c1=8=>b2=6=>g2=3=>h8=3=>a….i8<>8=& GT;i6<>5
#31 8?@a6=>c1=8=>h1=6=>h4=8=>a….i5<>8=>a6<>8
Basics (& X-wings) ignoring direct use of Rules
#25 More...
29/Apr/18 6:32 AM
=& GT;i6<>5
=>i6<>5
29/Apr/18 6:33 AM
Hi Alfred
Is that Quad 'naked' or 'hidden'?
I can't see it either way however.
Cheers Les
29/Apr/18 6:40 AM
Hi Les. After b5=8,a6=5=i4,g4=2=i2,the quad is born.

Best regards, Alfred.
29/Apr/18 7:31 AM
@rwm
See my comment (about DP paper) on yesterday's tough page.
Regards, Cenoman.
29/Apr/18 8:11 AM
Love the detailed caption, Kate, as all your photos have.
29/Apr/18 12:54 PM
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