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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat Jan 16, 2010 1:44 pm Post subject: Puzzle 10/01/16 (B) |
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| Code: | +-----------------------+
| . . 9 | 2 4 1 | 6 . . |
| . 3 . | . . 6 | . 8 . |
| 2 . . | . . . | . . . |
|-------+-------+-------|
| 3 . . | 5 . 2 | . 6 . |
| 6 . . | . 9 . | . . 3 |
| 5 2 . | 6 . 4 | . . . |
|-------+-------+-------|
| 9 . . | . . . | 8 4 . |
| . 6 . | 4 . . | 2 1 . |
| . . . | . 6 . | . . 9 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Sun Jan 17, 2010 4:12 pm Post subject: |
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Four steps
| Quote: | ER 5,
coloring 5,
x-wing 7,
(5=8)r8c5 - (8=7)r3c5 - r3c2 = r1c1 - (7=5)r1c9; r8c9<>5.
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Ted |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Jan 18, 2010 5:42 am Post subject: |
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More than four steps.
Two W-Wings, two ERs, coloring, XYZ-Wing and Type 1 UR. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Jan 18, 2010 6:50 am Post subject: |
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| Code: | c19 X-Wing <> 7 r1c2,r8c5
r1c8 2-String Kite/turbot fish <> 5 r9c2
c68 X-Wing <> 5 r3c25
<17+4> XYZ-Wing r2c7/r3c9+r4c7 <> 4 r3c7 extraneous
{ 50} -7r1c1 8r1c1 8r8c5 7r3c5 [ W-Wing ] <> 7 r3c2 -or-
{ 50} -7r2c5 5r2c5 5r1c2 7r1c9 [ W-Wing ] <> 7 r2c7 -or-
{ 50} -8r3c5 7r3c5 7r1c1 8r8c1 [ W-Wing ] <> 8 r8c5
+--------------------------------------------------------------+
| 78 58 9 | 2 4 1 | 6 3 57 |
| 14 3 145 | 9 57 6 | 147 8 2 |
| 2 147 6 | 38 78 358 | 179 579 14 |
|--------------------+--------------------+--------------------|
| 3 9 78 | 5 1 2 | 47 6 48 |
| 6 14 14 | 78 9 78 | 5 2 3 |
| 5 2 78 | 6 3 4 | 179 79 18 |
|--------------------+--------------------+--------------------|
| 9 157 15 | 137 2 37 | 8 4 6 |
| 78 6 3 | 4 58 9 | 2 1 57 |
| 14 1478 2 | 178 6 578 | 3 57 9 |
+--------------------------------------------------------------+
# 50 eliminations remain
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oaxen
Joined: 10 Jul 2006
Posts: 96
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| Posted: Mon Jan 18, 2010 11:45 am Post subject: |
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I know that some players don't like the "thread-method". Why I don't understand as it the most efficient way to solve a puzzle. As there normally are many "two-of-a-kind" on a row, column or block, the trick is to find out - through pure observations - which alternative can be the most prosperous. Then I follow the two possibilities simulaneously and very soon can find out "a must be" or "a can't be" and so it goes on.
In this puzzle the choise is between "5" in r1c2 or r1c9. The later one is correct and makes it a one stepper. |
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