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Jul 31 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1110
Location: Dar es Salaam Tanzania
PostPosted: Sun Jul 30, 2017 10:07 pm    Post subject: Jul 31 VH Reply with quote
Code:

+--------+-------------+----------+
| 9 5  6 | 8   3  1    | 47 27 24 |
| 2 8  3 | 67  46 47   | 1  9  5  |
| 7 4  1 | 25  9  25   | 3  6  8  |
+--------+-------------+----------+
| 5 37 2 | 179 48 3479 | 6  78 14 |
| 1 6  8 | 57  2  457  | 47 3  9  |
| 4 37 9 | 16  68 37   | 5  28 12 |
+--------+-------------+----------+
| 6 2  7 | 4   5  8    | 9  1  3  |
| 3 1  5 | 29  7  29   | 8  4  6  |
| 8 9  4 | 3   1  6    | 2  5  7  |
+--------+-------------+----------+

XY-Wing 78-4 with pivot in r4c8; r5c6<>4; stte
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Mon Jul 31, 2017 9:28 am    Post subject: Reply with quote
Hi everyone
Code:

+--------+-------------+-----------+
| 9 5  6 | 8   3  1    | 47 27  24 |
| 2 8  3 | 67  46 47   | 1  9   5  |
| 7 4  1 | 25  9  25   | 3  6   8  |
+--------+-------------+-----------+
| 5 37 2 | 179 48 3479 | 6  78  14 |
| 1 6  8 | 57  2  457  | 47 3   9  |
| 4 37 9 | 167 68 37   | 5  278 12 |
+--------+-------------+-----------+
| 6 2  7 | 4   5  8    | 9  1   3  |
| 3 1  5 | 29  7  29   | 8  4   6  |
| 8 9  4 | 3   1  6    | 2  5   7  |
+--------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site

Three possible solutions after basics.

1)[(4-7)R1C7=(7)R1C8-(7=8)R4C8 and (4)R1C7-(4)R1C9=(4)R4C9-(4=8)R4C5]=> contradiction two singles 8 in line 4=>-4R1C7=>stte.

2) [(7)R1C8-(7=8)R4C8-(8)R4C5 and (7)R1C8-(7=4)R1C7-(4)R1C9=(4)R4C9-(4)R4C5]=>contradiction R4C5=Ø=>-7R1C8=>stte.

3) [(6-4)R2C5=(4)R2C6-(4)R5C6=(4)R5C7-(4=1)R4C9-(1)R4C4 and (6)R2C5-(6)R6C5=(6-1)R6C4=(4-2)R1C9=> contradiction, no candidate 1 possible in column 4=>-6R2C5=>stte.

Ciao a Tutti
Paolo
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