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Tough Sudoku for 4/January/2014

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

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Check out the latest post in the Sudoku Forum

Welcome to the Sudoku Forums!

Submitted by: Gath

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everybody! We're snowed in today.

04/Jan/14 12:21 AM
Awwww! He may be old, but he's someone's baby!
(No, I don't mean Joe!)
04/Jan/14 1:58 AM
SE=7.2 UP to 29
1)x-chain:(-9)b6=(9)b2-e2=(9)b8-h8=(9)h4 => c4,g6<>9 UP=34
2)2-chain logic:(9=5)c3-b2=(9-6)b6=(6)b1=(1)b5 or (5)c3=(6)d3=(1)a3 => b1<>15,a3,de1<>6,a56<>1 UP=36
3)Ext. S-Wing:(8=1)h5-h9=(8)b9=(69)b12 or (1)h5-b5=(1)b6 => b6<>689 UP=81
04/Jan/14 2:02 AM
#0. N-tuples and LC; UP29
#1. Swordfish(9) : b6=b2-e2=e8-h8=h4 :=> -9c4g6; UP34
#2. Kraken (38 179)cf46 --> UR(38)cf46=9c6=9f3 :=> -9c3; UP81

UR(38)cf46
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9c6
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1f46-(1=9)f3
||
7f6-(7=3)d6-3d9=(3-4)f9=(4-9)f7=9f3
04/Jan/14 2:50 AM
Or

#2. HP(16)b16=1b5-(1=8)h5-8h9=NP(89)b92 :=> -89b16; UP81
04/Jan/14 3:19 AM
Poor old Schultz.
04/Jan/14 3:21 AM
Smart dog! Any dog, no matter what age, would be under the covers here today.-35 and with wind chill even colder Brrrrr.
04/Jan/14 5:11 AM
Happy new year everybody!

Standard techniques UP 29
1. (9)g7=f7-f3=c3-c4=gh4 =>g6<>9 UP 34
2. (5)h9=(5-4)g9=(4-9)g7=9f7-9f3=9c3-(9=5781)b2579-(1=8)h5 =>h9<>8 UP 81
04/Jan/14 7:08 AM
(27) 24@ac8=>ac8<>3&a7<>4
(29) 49@fg7=>f7<>1&g7<>5
(30) 7@def6=>g6<>7 6@ab6=>g6<>6
9?@g6=>[f7=9=>f3=1&c4=9=>c3=5=>d3=6]=>a3={}=>g6< >9
(35) More...
04/Jan/14 8:50 AM
1. Note fg7=49;ac8=24.Unique possibilities to 29.
2. Whether e8=9=g7;OR e2=9=b6;g6=2.UP34.
3. Whether h5=8=b9;OR h5=1,b579=578;b2=9.UP81.
04/Jan/14 9:17 PM
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