dailysudoku.com :: View topic

dailysudoku.com
Discussion of Daily Sudoku puzzles

FAQ

Memberlist

Usergroups

Profile

Jul 3 VH

dailysudoku.com Forum Index -> Daily Sudoku puzzles

View previous topic :: View next topic

Author

Message

Clement

Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

Posted: Sun Jul 03, 2016 12:00 am Post subject: Jul 3 VH

Code:

+----------------+------------+--------------+
| 1479 2 147 | 8 5 19 | 3 6 14 |
| 1489 49 148 | 3 2 6 | 7 459 1458 |
| 13689 369 5 | 14 149 7 | 18 29 128 |
+----------------+------------+--------------+
| 2 7 14 | 9 13 5 | 6 8 34 |
| 146 46 9 | 2 8 13 | 5 34 7 |
| 5 8 3 | 7 6 4 | 2 1 9 |
+----------------+------------+--------------+
| 3789 35 78 | 6 139 139 | 4 235 12358 |
| 3489 3459 6 | 14 7 2 | 18 35 1358 |
| 34 1 2 | 5 34 8 | 9 7 6 |
+----------------+------------+--------------+

X-Wing on 1 in col 47; rc3c159, r8c9 <>1 and
XY-Wing 34-1 pivoted in r9c5; r7c5 <>1 opens
XY-Wing 23-9 pivoted in r7c8; r3c5 <> 9; stte

JC Van Hay

Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

Posted: Sun Jul 03, 2016 7:11 am Post subject:

Code:

+-----------------+---------------+---------------------+
| 1479 2 147 | 8 5 19 | 3 6 14 |
| 1489 49 148 | 3 2 6 | 7 459 145 |
| 36 36 5 | 14 149 7 | (18) 29 1(28) |
+-----------------+---------------+---------------------+
| 2 7 14 | 9 13 5 | 6 8 34 |
| 146 46 9 | 2 8 13 | 5 34 7 |
| 5 8 3 | 7 6 4 | 2 1 9 |
+-----------------+---------------+---------------------+
| 378 35 78 | 6 139 139 | 4 235 358(2-1) |
| 3489 3459 6 | 4-1 7 2 | 8(1) 35 358(1) |
| 34 1 2 | 5 34 8 | 9 7 6 |
+-----------------+---------------+---------------------+

L3-Wing{1C7, 8R3, 2C9} -> -{1r7c9}; Pointing{1B9} -> -{1r8c4}; stte

George Woods

Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

Posted: Tue Jul 05, 2016 9:47 am Post subject: Removing the 5 from r7c8

Clement's Final wing needs the 5 to be removed from r7c8 Proving that this cell is not 5 can be done thus - if it were 5 then the 28 in cells r78c9 give cell r3c9 desolate. However this type of logic is not usual for a VH problem.

bat999

Joined: 09 Jul 2015
Posts: 55
Location: UK

Posted: Wed Jul 06, 2016 3:56 pm Post subject:

Code:

.------------------.-----------------.--------------------.
| 1479 2 147 | 8 5 19 | 3 6 14 |
| 1489 49 148 | 3 2 6 | 7 459 145 |
| 36 36 5 | c14 149 7 | c18 9-2 c128 |
:------------------+-----------------+--------------------:
| 2 7 14 | 9 13 5 | 6 8 34 |
| 146 46 9 | 2 8 13 | 5 34 7 |
| 5 8 3 | 7 6 4 | 2 1 9 |
:------------------+-----------------+--------------------:
| 378 a35 78 | 6 b139 b139 | 4 a235 1358-2 |
| 3489 3459 6 | b14 7 2 | 18 35 1358 |
| 34 1 2 | 5 34 8 | 9 7 6 |
'------------------'-----------------'--------------------'

(2=3)r7c28 - (3=4)r7c56,r8c4 - (4=2)r3c479 => -2 r3c8,r7c9; stte
Cool

dongrave

Joined: 06 Mar 2014
Posts: 568

Posted: Thu Jul 07, 2016 5:54 am Post subject: Re: Removing the 5 from r7c8

George Woods wrote:

Clement's Final wing needs the 5 to be removed from r7c8
Proving that this cell is not 5 can be done thus - if it were 5 then the 28 in cells r78c9 give cell r3c9 desolate. However this type of logic is not usual for a VH problem.

No, that's not right George. The 5 gets removed from r7c8 with just Clement's wings and basics. Clement's initial grid has a hidden 36 pair in row 3 so r3c12 = 36. Then his X Wing removes 1 from r3c59 and r8c9. The 34-1 XY Wing removes 1 from r7c5 which leaves a lone 1 in column 5 so r4c5=1 which means r5c6<>1 so it's 3 and r4c3<>1 so it's 4 so r5c2<>4 so it's 6 so r3c2<>6 so it's 3 so r7c2<>3 so it's 5 so r7c8<>5.

Display posts from previous:

	dailysudoku.com Forum Index -> Daily Sudoku puzzles	All times are GMT
Page 1 of 1

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum