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Tough Sudoku for 2/November/2009


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

  1 2 3 4 5 6 7 8 9
Check out the latest post in the Sudoku Forum

Sudoku Solving Techniques

Submitted by: sudoku lover

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Oh Oh - the 1s slipped into this puzzle pretty quickly . Maybe I was missing something but after that it all seized up for me. I don't have the time to plug at this one. I'm off to bed.
02/Nov/09 12:22 AM
02/Nov/09 1:04 AM
Cool ... pink water!
02/Nov/09 1:14 AM
Tough tough.
02/Nov/09 2:13 AM
That was tough. all!!
02/Nov/09 3:37 AM
~50 minutes
02/Nov/09 9:02 AM
Is Sydney Kates husband?
02/Nov/09 11:40 AM
Sydney is where Kate lives.
Not me - the other Kate of Sydney.
02/Nov/09 6:36 PM
Got stuck after :
1. UPs to 26.
2. c2=4 (because c8=4 leads to a quick contradiction).UP29.
Then I could only find very long and messy chains.

02/Nov/09 11:56 PM
1) Start at 23, basic techniques to UP=26
2) (2)e2=g2-g7=(2-4)b7=h7-h6=d6-f5=(4)f1,=>f1<>2.UP=28
3)(4):c2=d2-f1=f5-i5=i8,=>c8<> ;4.UP=34
4) (9=7)d7-d2=g2-g45=(7-4)i5=i8-b8=(4-2)b7=(2)g7,=>bg7<>9.UP=39
5)(6)i1=f1-(6=3)f9-(3=5)d9-(5 =2)i9,=>i1<>2.UP=81
03/Nov/09 3:32 AM
Nice solution,Sotir.Could only reach UP37 from your step 4) at first,but finally figured out how to arrive at UP39.
03/Nov/09 11:10 AM

10/Sep/10 7:21 AM
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