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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Jul 20, 2010 4:19 am Post subject: Puzzle 10/07/20: C |
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My rating guideline is gone. It wasn't being used anyway.
| Code: | +-----------------------+
| 4 . . | . . . | . 9 . |
| . 9 . | 3 . 4 | 5 . . |
| . . 5 | 9 . . | . 2 . |
|-------+-------+-------|
| . 5 8 | 2 . 9 | 6 4 1 |
| . . . | . . . | 2 . . |
| . 2 . | 8 . . | . . 9 |
|-------+-------+-------|
| . 4 . | 5 9 . | 3 . . |
| 5 . 9 | 6 . . | . 1 2 |
| . . . | 4 . 2 | . 6 . |
+-----------------------+
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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: Tue Jul 20, 2010 1:45 pm Post subject: |
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Danny,
I enjoy all your puzzles, rated or not. Thanks for all the time and energy you commit to provide us these pleasures.
For this puzzle I used two steps.
| Quote: | AXY-wing 1-67 vertex (17)r1c4, pincers (67)r1c2 & (16)r3c5 with fin (1)r1c2
If xy-wing is true: r1c56,r3c12<>6
If fin is true: (1)r1c2-r1c7=r3c7-(1=6)r3c5; r1c56,r3c12<>6
UR12[(5)r1c5=(7)r1c3]r12c35-r1c46=r3c6-(7=3)r8c6-(3=5)r6c6; r1c6<>5 |
Ted |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Tue Jul 20, 2010 6:35 pm Post subject: |
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Here's a pretty ugly one-stepper using an ANT to delete two digits..
Consider the ANT(168) r3c567
If the triple exists then it eliminates (16) from r3c12.
If r3c6=7 then it forces 6 in r3c5 and 1 in r2c3, again eliminating (16) from r3c12.
Something like...
| Code: |
ANT[(168)r3c567=(7)r3c6] - (7=1)r1c4 - (1=6)r3c5 ; r3c12<>6
- (1=2)r2c5 - (2=1)r2c3 ; r3c12<>1 |
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Tue Jul 20, 2010 7:57 pm Post subject: |
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Sorry Peter but I do not see any 'ugly" in that move.
Ted |
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Luke451
Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
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| Posted: Tue Jul 20, 2010 9:32 pm Post subject: |
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Also the ole hidden pair trick in that neighborhood:
| Code: | *-----------------------------------------------------------*
| 4 167 127 | 17 1256 5678 | 18 9 3 |
| 8 9 12 | 3 12 4 | 5 7 6 |
| 1367 1367 5 | 9 16 678 | 18 2 4 |
|-------------------+-------------------+-------------------|
| 37 5 8 | 2 37 9 | 6 4 1 |
| 9 1367 1347 | 17 1456 3567 | 2 35 8 |
| 136 2 134 | 8 1456 356 | 7 35 9 |
|-------------------+-------------------+-------------------|
| 2 4 6 | 5 9 1 | 3 8 7 |
| 5 378 9 | 6 378 37 | 4 1 2 |
| 137 1378 137 | 4 378 2 | 9 6 5 |
*-----------------------------------------------------------* |
hp(37)r3c12=(7)r3c6-(7=1)r1c4-(1=6)r3c5 =>r3c12<>6 |
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