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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Sat May 28, 2011 5:55 pm Post subject: Puzzle 11/05/28: ~ XY |
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| Code: | +-----------------------+
| . 3 . | 2 4 . | 7 . 5 |
| 4 7 . | . . 5 | . . . |
| . . . | . . . | . . 6 |
|-------+-------+-------|
| 7 . . | 4 9 . | . 2 8 |
| 9 . . | 8 2 . | . . . |
| . 8 . | . . 7 | . . . |
|-------+-------+-------|
| 1 . . | . . . | 4 6 . |
| . . . | 6 . . | 1 8 . |
| 6 . 4 | 1 . . | . . 7 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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JC Van Hay
Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
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| Posted: Sun May 29, 2011 8:11 am Post subject: |
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Just to relax after the high flying discussions on the Eureka Forum  ...
| Quote: | | If r2c4=9 Then r3c6=8, r37c45=37. Therefore r2c4=3. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Mon May 30, 2011 4:48 am Post subject: |
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Hidden UR (35); r5c3<>3
XY-Wing (135); r4c3, r5c7<>5
DP (37), boxes 28; all possibilities solve box 8 the same |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Mon May 30, 2011 7:49 am Post subject: |
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JC (and Marty) nice UR move! An example of where mixing internal and external SIS can make it very clear...
| Code: | | ur(37)r37c45[(9)r7c4=(3)r2c4] ; r2c4<>9 |
I found an m-wing-like move..
| Code: | | m-wing-like(69) ; (6=1)r1c6=(1=9)r1c8 - r6c8=(9-6)r6c7=r6c5 ; r2c5<>6, r5c6<>6 |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon May 30, 2011 3:26 pm Post subject: |
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My solver also found r2c4<>9. However, I decided to see if I could find something my solver couldn't find.
| Code: | <29> DP r7c69,r8c29,r9c26
(3)r7c9 - (3)r9c7
(8)r9c6 - (8=3)r9c5 - (3)r9c7
+--------------------------------------------------------------+
| 8 3 69 | 2 4 16 | 7 19 5 |
| 4 7 269 | 39 16 5 | 8 139 1239 |
| 5 1 29 | 379 378 89 | 239 4 6 |
|--------------------+--------------------+--------------------|
| 7 6 135 | 4 9 13 | 35 2 8 |
| 9 4 135 | 8 2 136 | 356 7 13 |
| 2 8 13 | 5 16 7 | 369 139 4 |
|--------------------+--------------------+--------------------|
| 1 5 8 | 379 37 *29 | 4 6 *29+3 |
| 3 *29 7 | 6 5 4 | 1 8 *29 |
| 6 *29 4 | 1 38 *29+8 | 29-3 5 7 |
+--------------------------------------------------------------+
# 51 eliminations remain
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