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Tough Sudoku for 13/June/2013

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Check out the latest post in the Sudoku Forum

Sudoku Solving Techniques

Submitted by: sudoku lover

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Southwest colors...
13/Jun/13 12:09 AM
That's an ugly tree.
13/Jun/13 1:10 AM
#1. UP33; Chain[4] : 5e3=(35)e45.h5-5b5=5b23 :=> c3=2; UP81
13/Jun/13 1:55 AM
Is that Death Valley?
13/Jun/13 4:15 AM
SER=7.1
Hi JC. I can't figure out what you are trying to do. (5)e3=(38)e45. If you are trying to use trial & error, it should be (5)c3 = (8)c3 = (35)e45,etc.
Regards, Bud
13/Jun/13 4:30 AM
#1: UP33
#2: (1)a7=(2367)a4567-(23)a1=(14)ah1-(4=2)c1-(2=15)bc3 => a1<>1, UP81
13/Jun/13 5:57 AM
Standard techniques UP 33
1. (1)b3=f3-(1=3)f2-df1=(3)a1 =>a1<>1 UP 81
13/Jun/13 6:06 AM
Hi Bud.
The chain I wrote is based on the following 4 native SIS : 5e345 3e45 (35)h5 5b235.
Clearly, either e3=5 or e45=HP(35)->b5<>5 with the help of (35)h5->b23=5; in both cases, c3=2.
Equivalently, with ALS instead of AHS : Chain[4] : (5=8)e3-(8=35)eh5-5b5=5b23 :=> -5c3(=2).
Regards, JC.
13/Jun/13 6:13 AM
My solution was almost the same as cenoman's.
SSTS to UP33.
(1)b3=f3-(1=3)f2-b2=a1 => a1<>1; UP81.
13/Jun/13 8:11 AM
(26) 35@h58=>h58<>18
(28) 14@h12=>[h3<>1&h5<>4]
(34) e4=5=>{e3=8,b2=3=>f2=1&h5=5=>c6=5=>b3=5=>c3=2}=>f3={}=>e4<>5
(35 ) c3=5=>be5=5=>c3<>5

VHBC to 81
V:Only cell left More...
13/Jun/13 8:12 AM
In English:
1. Note h58=35.Unique possibilities to 33.
2. Whether f2=1=b3;OR f2=3=a1;a1<>1.UP81.
13/Jun/13 8:39 AM
I used basic techniques all the way.
13/Jun/13 10:52 AM
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