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Tough Sudoku for 19/July/2013

                 
                 
                 
                 
                 
                 
                 
                 
                 

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

  1 2 3 4 5 6 7 8 9
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Submitted by: Gath

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SE 3.4 (groan)
Why bother.
19/Jul/13 12:12 AM
Is he in your pool, Sue?
19/Jul/13 12:12 AM
Shiela, In the water at Mackinaw Island.
19/Jul/13 1:37 AM
19/Jul/13 2:09 AM
SG is here to save the day! Jiminoregon, two toughies generated this morning:
P3:
P31: Symmetry=None, Start=25, SSTS=28
SG @ 3 kraken, 4 aic; SE=9.0 @ 11 dynamic kraken, 10 kraken, 10 FC
000000050480000700025960008100300000000008100060000309040100000000024073002089000
P32: More...
19/Jul/13 3:45 AM
note: posted path for yesterday's unsolved challenger C1; (sorry JC, 'guess & test' brute-force observations don't cut it).
19/Jul/13 3:57 AM
Jiminoregon: I did yesterday's 7.2 - first puzzle below 8.4 in over a year!
----------------------
// als-xz: (8=34)i46-(2459=8)i23h12 # -8i1
1. (8)h1=ef1-(248=6)f236-f4=h4 # -8h4
19/Jul/13 4:54 AM
Note b3/c2=14.Unique possibilities to 81.
19/Jul/13 5:06 AM
thanks, kobold, you are very good at pattern recognition!
19/Jul/13 5:24 AM
(25) 14@b3c2=>c2<>9=>9@a23=>a9<>9
(32) 56@g8h7=>g8h7<>3=>3@i78=>i1<>3
(33) 14@b3c2=>b3<>2
(44) 56@bc1=>d1<>5

VHBC to 81
V:Only cell left in Vertical column for this More...
19/Jul/13 6:39 AM
P31
#1. sk-basics; UP28
3 Singles; hi1=14; LC(1,3,7); ER(6) : f6=f3-ghi3=g12 :=> -6g5

Best starting points according to sk-strategy : h7, row 8, e8 respectively.
#2. h7=1->C(S) :=> h7=3; UP33
#3. SS(7ce3.cd4) :=> e3=7; UP39; LC(5)d12 :=> -5d458; UP81
More...
19/Jul/13 6:54 AM
P31:
// SG had an easy game here, shortest path I found is 2 krakens;
// I'd like to emphasize that these paths are fundamentally different from
// the mindless 'guess & test' game, identical to the brute-force
// method used by SG to solve the empty grid and generate a puzzle; More...
19/Jul/13 7:24 AM
Just posted a path for P2 SE=9.0,1k + 8aic.
19/Jul/13 9:03 PM
// P32 again: 2 krakens (0..3 aic) , but much tougher than P31:

// als-xz: (6=2489)d3f123-(38=6)d4f6 # -6f4
1. DK: (138=7)a4 - (7=12)a8 # -6c4
[(6=3)d4-a4=*WW(18)a4,e5/g45-(1=368)df4f6-(2489=6)d3f123-f6=c6]
||
[(5)c4=b5-b7=(5-392')df7f 9=df8-(2=*1)a8-a45=(51')b5c4]
2. More...
20/Jul/13 4:14 AM
9:39
21/Jul/13 11:12 PM
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