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Tough Sudoku for 7/February/2015

                 
                 
                 
                 
                 
                 
                 
                 
                 

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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Love the rounded peaks - in contrast to the 'needle-like' peaks in some desert areas of the US.
07/Feb/15 12:45 AM
1. Note g12=34.Unique possibilities to 26.
2. Whether g3=7=hi8,c8=2;OR g3=8,g7=2,hi1=25;c17=61.UP34.
3. d12<>4 to avoid the 34 unresolvable rectangle @ dg12.UP81.
07/Feb/15 1:11 AM
SER=8.4 UP to 26
Ext. M-Wing:(7)g9=(2)g7=(8)g3=(25)hi1=(6)c1 or(7)c7=(2)c8=(6)c1 => c1=6,c7<>2 UP=81
07/Feb/15 1:27 AM
[7g9=(7-6)c9=(6-2)c1=2a2-(2=17)hi2]-(7=8)g3; UP81
07/Feb/15 1:28 AM
Photo is good illustration to correct a common painter's mistake... not going lighter as you near the horizon.
07/Feb/15 2:31 AM
Another interesting photo, of a special place.
07/Feb/15 4:29 AM
3-link AIC
Standard techniques UP 26
1. (6)c9=(625-8)chi1=(8-7)g3=(7)g9 =>-7c9 UP 81
07/Feb/15 5:12 AM
Also known as 'The Olgas'.
07/Feb/15 5:25 AM
As shown by the others, no need for my step 3.
07/Feb/15 6:07 AM
#26 5@hi8=>g9<>5 345@abc3=>g3<>345=>34@g12=>g1<>5&i12<>3
#27 345@bc3=>c1<>35=>35@c34=>c4<>17=>7@c79=>b9<>7
1?@c9=>g9 =7=>g3=8=>g7=2=>c7={}=>c9<>1
#28 More...
07/Feb/15 7:56 AM
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