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Aug 19 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 940
Location: Rimini, Italy
PostPosted: Fri Aug 18, 2017 10:14 pm    Post subject: Aug 19 VH Reply with quote
Hi everyone,

Code:

+-------------+-----------+--------+
| 259 59  125 | 7  19  4  | 8  3 6 |
| 4   6   8   | 2  3   5  | 7  9 1 |
| 39  79  137 | 69 169 8  | 4  2 5 |
+-------------+-----------+--------+
| 6   579 57  | 3  2   79 | 1  4 8 |
| 29  8   27  | 4  79  1  | 6  5 3 |
| 1   3   4   | 5  8   6  | 9  7 2 |
+-------------+-----------+--------+
| 8   4   35  | 69 569 29 | 23 1 7 |
| 35  1   9   | 8  57  27 | 23 6 4 |
| 7   2   6   | 1  4   3  | 5  8 9 |
+-------------+-----------+--------+

Play this puzzle online at the Daily Sudoku site

some options

Quote:
XYZ-Wing 2,5,9 in r5c1, r1c12 and -9 in r3c1
or
finned X-Wing with number 9 in r15c15 +r1c2 and -9 in r3c1
or
Empty Rectangle with number 9 in sector 2 r3c5, r5c5, r5c1 and again -9 in r3c1


Ciao Gianni
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Sat Aug 19, 2017 10:11 am    Post subject: Reply with quote
Hi everyone

Other solutions

[(5)R1C1-(5)R1C2=(5)R4C2-(5=7)R4C3 and (5-2)R1C1=(2)R5C1-(2=7)R5C3]=> contradiction two singles 7 in box 4 or column 3=> -(5)R1C1=>stte.

[(5)R7C3-(5)R4C3=(5)R4C2-(5=9)R1C2 and (5-3)R7C3=(3)R3C3-(3=9)R3C1]=> contradiction two singles 9 in box 1=>-5 R7C3=>stte.

Another solution -3R8C1=>stte.

R8C1=3 is biunivoca with R7C3=5.

Ciao a Tutti
Paolo
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sat Aug 19, 2017 11:22 am    Post subject: Aug 19 VH Reply with quote
The old reliable, less sophisticated xywing!

359 xywing @ R3C1, -5R1C1

Early Earl
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Sat Aug 19, 2017 12:10 pm    Post subject: Reply with quote
Hi Earl


Of course it is true.

However, I believe that the AIC for the xy chain (xywing)
(5 = 9) R1C2- (9 = 3) R3C1- (3 = 5) R8C1- (5) R1C1 => -5R1C1 has a similar difficulty of the demonstration that I given with two small chains. It's always a contradiction.

Ciao a Tutti

Paolo
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