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Tough Sudoku for 4/May/2015


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Sudoku Solving Techniques

Submitted by: sudoku lover

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difficult to find a short path SE=7.3 (SG used 8 chains)

1. (68)e6,(84)f6,(45)f4* - (5)f3=(5-6)h3=i2 # -6i6
ext. * - (5)f13=(5-7)e1=de2-a2=(7-9)a6=h6 # -6ah6

2. (7=239)g134-(9)h7=(9-7)a6=a2-c3=g3 # -7g27

3. (9)g7 = MW(95)e9/(5)dh7.(9)hc7* - (9)c9 = WW(62)c9*,h5 - (6)c5=h5-i4=(6-4)i2=g2 # -4g7
04/May/15 1:27 AM
Perfect name for a beach with coloured sand. Nice photo, Wendy.
04/May/15 4:09 AM
Like Kobold,

Basics; UP31
e6=8 -> contradiction :=> f6=8; UP35
g4=9 -> contradiction :=> h6=9; UP81


Basics; UP31
f4=4 or f4=5=h3=e1; i2=6 and de2=7=c3, c6=3; i6=4 :=> -4f6,gi4; UP35
a6=9, c6=7=g3 or h6=9=g7, g2=4 :=> -7g72
g2=4 or i2=4, i4=6=c5, h5=2=i9; c9=9, e9=5=h7; g7=9 :=> -4g7; UP81
04/May/15 4:37 AM
Can be done with 2 chains.
04/May/15 7:54 AM
#27 37@c36=>{9@c789=>b7a9<>9,c3<>1,c6<>7} #31 4@d79=>d6<>4
#40 4?@i2=>[h3=6=>f3=5&g4=4=>f4=5]=>i2<>4
#42 59@e19=>e48<>5=>5@ei9=>a9<>5
#43 17@de2=>3@f123=>f8<>3 More...
04/May/15 7:55 AM
Hi Les. After d6<>4, UP31, how do you get to UP39.You seem to determine that a6=7, but i can't follow your reasoning for that.

Best regards, Alfred.
04/May/15 12:06 PM
Hi Alfred. I erroneously stated 37@c36=> c6<>7 earlier. Thanks Les
05/May/15 7:18 AM
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