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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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 Posted: Sun Mar 13, 2011 11:13 pm Post subject: Good puzzle, I used Hoduko to generate. |
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| Code: | 3 . .|. . .|9 . 2
. 5 .|3 . .|7 . .
. . 7|4 . 2|. . .
-----+-----+-----
. . .|8 . .|3 . .
. . .|5 2 3|. . .
. . 8|. . 1|. . .
-----+-----+-----
. . .|7 . 4|6 . .
. . 9|. . 6|. 4 .
1 . 4|. . .|. . 5 |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon Mar 14, 2011 4:53 pm Post subject: |
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| Code: |
+-------+-------+-------+
| 3 . . | . . . | 9 . 2 |
| . 5 . | 3 . . | 7 . . |
| . . 7 | 4 . 2 | . . . |
+-------+-------+-------+
| . . . | 8 . . | 3 . . |
| . . . | 5 2 3 | . . . |
| . . 8 | . . 1 | . . . |
+-------+-------+-------+
| . . . | 7 . 4 | 6 . . |
| . . 9 | . . 6 | . 4 . |
| 1 . 4 | . . . | . . 5 |
+-------+-------+-------+
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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: Mon Mar 14, 2011 6:57 pm Post subject: |
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| I won't bother with the gory details, but it took me nine moves to reduce the grid to a BUG+2. |
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storm_norm
Joined: 18 Oct 2007
Posts: 1741
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| Posted: Tue Mar 15, 2011 7:46 am Post subject: |
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| Code: | +-------------------+----------------+---------------------+
| 3 4 6(1) | 6(1) 7 5 | 9 8 2 |
| 689 5 2 | 3 1689 89 | 7 16 4 |
| 689 189 7 | 4 1689 2 | 5 3 16 |
+-------------------+----------------+---------------------+
| 2469 129 5 | 8 469 7 | 3 1269 169 |
| 4679 79-1 6(1) | 5 2 3 | 48(1) 69-1 6789-1 |
| 24679 3 8 | 69 469 1 | 24 5 679 |
+-------------------+----------------+---------------------+
| 258 28 3 | 7 158 4 | 6 129 189 |
| 2578 278 9 | 2(1) 58-1 6 | 28(1) 4 3 |
| 1 6 4 | 29 3 89 | 28 7 5 |
+-------------------+----------------+---------------------+ |
#1... sword on 1's... (1)r5c7 = (1)r8c7 - (1)r8c4 = (1)r1c4 - (1)r1c3 = (1)r5c3;
its also a loop.
any other 1's in rows 1, 5 and 8 are eliminated.
| Code: | +----------------+--------------+------------------+
| 3 4 16 | 16 7 5 | 9 8 2 |
| 689 5 2 | 3 1689 89 | 7 16 4 |
| 689 189 7 | 4 1689 2 | 5 3 (16) |
+----------------+--------------+------------------+
| 2469 129 5 | 8 469 7 | 3 1269 (169) |
| 4679 79 16 | 5 2 3 | 148 (69) 789-6 |
| 24679 3 8 | 69 469 1 | 24 5 79-6 |
+----------------+--------------+------------------+
| 258 28 3 | 7 158 4 | 6 129 189 |
| 2578 278 9 | 12 58 6 | 128 4 3 |
| 1 6 4 | 29 3 89 | 28 7 5 |
+----------------+--------------+------------------+ |
#2...xyz-wing (1,6,9) r56c9 <> 6
| Code: | +----------------+----------------+------------------+
| 3 4 16 | 16 7 5 | 9 8 2 |
| 689 5 2 | 3 1689 89 | 7 16 4 |
| 689 189 7 | 4 1689 2 | 5 3 16 |
+----------------+----------------+------------------+
| 2469 129 5 | 8 469 7 | 3 1269 169 |
| 4679 79 16 | 5 2 3 | 8(14) 69 789 |
| 24679 3 8 | 69 469 1 | -2(4) 5 79 |
+----------------+----------------+------------------+
| 258 28 3 | 7 158 4 | 6 129 189 |
| 2578 278 9 | (12) 58 6 | 28(1) 4 3 |
| 1 6 4 | 9(2) 3 89 | 8(2) 7 5 |
+----------------+----------------+------------------+ |
#3...(2)r9c7 = (2)r9c4 - (2=1)r8c4 - (1)r8c7 = (1-4)r5c7 = (4)r6c7; r6c7 <> 2
#4...skyscraper 6: r2c1 <> 6
#5...bug+1: r3c1 = 9 |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Tue Mar 15, 2011 4:22 pm Post subject: |
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Seems like I missed the swordfish again!
| Code: | anp(28=1)r98c7 - (1=2)r8c4 - (2=9)r9c4 - (9=8)r9c6 - (8=2)r9c7 ; r6c7<>2
skyscraper(6) c3, c8 ; r2c1<>6
BUG+2[(9)r3c1=(1)r5c8] - (1=6)r5c3 - (6=9)r4c1 ; r2c1<>9 (or x-wing(1)/BUG+1) |
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