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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Tue Mar 01, 2011 10:24 pm Post subject: Puzzle 11/03/01 Difficult |
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| Code: | +-----------------------+
| 9 . 7 | . 8 3 | 6 . . |
| . 6 . | . 2 . | . . 9 |
| 1 . 3 | . . . | . . 2 |
|-------+-------+-------|
| . . . | . . 2 | . . . |
| 2 3 . | . 7 9 | 1 . 6 |
| 7 . . | 1 5 6 | 2 . 3 |
|-------+-------+-------|
| 8 . . | . 9 5 | 3 . . |
| . . . | . . . | . 6 . |
| . 7 6 | . 3 8 | . . 1 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Wed Mar 02, 2011 5:54 am Post subject: |
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| I couldn't do a thing with this. After an ER, AIC, XY-Wing and M-wing failed to open anything up, I turned to my Medusa crutch. That resulted in a wrap which reduced the grid to a BUG+2. |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Wed Mar 02, 2011 6:21 pm Post subject: |
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A wing-like move did some damage...
| Code: | w-wing(24) with pseudocell/als ; (2=4)r9c4 - r1c4=r1c9 - (47=2)r7c98 ; r9c8<>2
skyscraper(5) r2, r5 ; r3c8<>5 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Wed Mar 02, 2011 11:05 pm Post subject: |
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The initial turbot step is extraneous. The XY-Chain is deadly!
| Code: | r1 b8 Empty Rectangle <> 4 r8c9 -or-
r1c6 2-String Kite <> 4 r8c9
+--------------------------------------------------------------+
| 9 2 7 | d45 8 3 | 6 1 c45 |
| 45 6 458 | 457 2 1 | 4578 3 9 |
| 1 458 3 | 9 6 47 | 4578 578 2 |
|--------------------+--------------------+--------------------|
| 6 1589 1589 | 3 4 2 | 5789 5789 578 |
| 2 3 45 | 8 7 9 | 1 45 6 |
| 7 489 489 | 1 5 6 | 2 489 3 |
|--------------------+--------------------+--------------------|
| 8 14 124 | 6 9 5 | 3 a27 b47 |
| 3 459 2459 | 247 1 47 | 458 6 58 |
| 45 7 6 | e24 3 8 | 459 59-2 1 |
+--------------------------------------------------------------+
# 62 eliminations remain
XY-Chain: (2=7)r7c8 =4r7c9 =5r1c9 =4r1c4 =2r9c4 => r9c8<>2
r36 X-Wing <> 8 r4c2
BUG+1 = 5 r4c3
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tlanglet
Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
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| Posted: Wed Mar 02, 2011 11:34 pm Post subject: |
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I used a two stepper........
(4)r8c6=(4)r3c6-r1c4=r1c9-(4=7)r7c9-(7=2)r7c8-r9c8=r9c4-als(2=47)r8c46; r8c2379<>4
xy-wing 45-8 vertex (45)r5c3; r3c2,r4c3<>8
Ted |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Thu Mar 03, 2011 12:01 am Post subject: |
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Ted: your chain is an ALS too long:
(4)r8c6=(4)r3c6-r1c4=r1c9-(4=7)r7c9-(7=2)r7c8-r9c8=(2)r9c4 => r9c4<>4 |
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