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Puzzle 10/07/11: tricky VH+

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Jul 11, 2010 8:01 am    Post subject: Puzzle 10/07/11: tricky VH+ Reply with quote
Code:
 +-----------------------+
 | 6 . 5 | 4 . 2 | 8 3 . |
 | . . . | . 6 . | 2 . . |
 | . . 8 | . 3 9 | . . 4 |
 |-------+-------+-------|
 | 7 . . | 9 . . | . . . |
 | . 3 . | . 4 . | . . 1 |
 | 8 . 4 | . . 7 | . . . |
 |-------+-------+-------|
 | 3 2 . | . . . | 9 . 8 |
 | 9 . . | . . . | . . . |
 | . . . | . . . | 6 . 2 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

Code:
 after basics
 +--------------------------------------------------------------+
 |  6     9     5     |  4     1     2     |  8     3     7     |
 |  1     4     3     |  7     6     8     |  2     59    59    |
 |  2     7     8     |  5     3     9     |  1     6     4     |
 |--------------------+--------------------+--------------------|
 |  7     16    2     |  9     58    13    |  345   458   356   |
 |  5     3     9     |  28    4     6     |  7     28    1     |
 |  8     16    4     |  13    25    7     |  35    259   3569  |
 |--------------------+--------------------+--------------------|
 |  3     2     16    |  16    7     45    |  9     45    8     |
 |  9     58    167   |  1268  28    145   |  345   17    35    |
 |  4     58    17    |  38    9     35    |  6     17    2     |
 +--------------------------------------------------------------+
 # 44 eliminations remain
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Jul 12, 2010 5:19 am    Post subject: Reply with quote
Quote:
Type 1 UR (17)
XY-Wing (285), flightless with pincer transport
XY-Chain
XY-Chain + extension of same
BUG+2
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Mon Jul 12, 2010 1:13 pm    Post subject: Reply with quote
Danny, this was a very fun puzzle. My four steps were

Quote:
Type 1UR (17)r89c38; r8c3<>17
Flightless w-wing 35 in r6c7 & r9c6 and SL (3)r69c4 plus transport (5)r9c6-r9c2=(5)r8c2*-r8c79=(5)r7c8**-r246c8=(5)r2c9; r8c7*,r46c8**,r46c9<>5
Flightless w-wing 35 in r8c9 & r9c6 and SL (5)r7c68 plus transport (3)r9c6-r9c4=(3)r6c4; r6c9<>3
BUG+2: (8)r8c4=(5)r8c6-(5=8)r8c2; r8c5<>8

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Jul 12, 2010 2:02 pm    Post subject: Reply with quote
This puzzle was tricky because it took concurrent URs to crack it.

Code:
 r89c38  <17> UR Type 1.2223             r8c3<>17   concurrent
 r78c34  <16> UR Type 4.2234             r8c34<>1
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Mon Jul 12, 2010 4:25 pm    Post subject: Reply with quote
V nice Danny - something not as elegant I'm afraid and not as much fun as Ted's:

Quote:
XY Chain on 3s with pincers at r6c7 and r9c4
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Mon Jul 12, 2010 6:32 pm    Post subject: Reply with quote
daj95376 wrote:
This puzzle was tricky because it took concurrent URs to crack it.

Code:
 r89c38  <17> UR Type 1.2223             r8c3<>17   concurrent
 r78c34  <16> UR Type 4.2234             r8c34<>1


Danny, you surely beat me on that solution. I used the UR17, and glanced at the UR16 as a Type 3 and rejected it. My error........

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Jul 12, 2010 9:16 pm    Post subject: Reply with quote
I saw the concurrency and blew it big-time by not playing the 16 UR because I mistakenly thought it wasn't a help.
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