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Vanhegan extreme

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Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Mon Apr 09, 2012 4:58 am Post subject: Vanhegan extreme

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This is puzzle 6-1269028, rated 2.1.0.2.1. I've commented before that the difficulty of these seems incredibly uneven. I just did one with a more difficult rating which was a one-stepper and this one borders on the impossible for me.

Code:

+----------------+-------------------+----------------+
| 178 1468 9 | 1478 2 1457 | 156 1567 3 |
| 178 5 478 | 1478 3 6 | 12 9 247 |
| 137 1346 2 | 9 157 1457 | 156 8 4567 |
+----------------+-------------------+----------------+
| 9 248 3 | 247 578 2457 | 2568 2567 1 |
| 258 7 1 | 6 58 9 | 3 4 258 |
| 6 248 458 | 12347 1578 123457 | 9 257 2578 |
+----------------+-------------------+----------------+
| 12357 9 57 | 1237 6 8 | 4 125 25 |
| 1278 128 678 | 5 4 127 | 1268 3 9 |
| 4 1238 568 | 123 9 123 | 7 1256 2568 |
+----------------+-------------------+----------------+

Play this puzzle online at the Daily Sudoku site

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arkietech

Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

Posted: Mon Apr 09, 2012 6:08 am Post subject:

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Not pretty

Code:

*-----------------------------------------------------------------------------*
| 178 1468 9 | 1478 2 1457 | 156 1567 3 |
| 178 5 478 | 1478 3 6 | 12 9 247 |
| 137 1346 2 | 9 157 1457 | 156 8 4567 |
|-------------------------+-------------------------+-------------------------|
| 9 248 3 | 247 578 2457 | 2568 2567 1 |
| 258 7 1 | 6 58 9 | 3 4 258 |
| 6 248 458 | 12347 1578 123457 | 9 257 2578 |
|-------------------------+-------------------------+-------------------------|
| 12357 9 57 | 1237 6 8 | 4 125 25 |
| 1278 128 678 | 5 4 127 | 1268 3 9 |
| 4 1238 568 | 123 9 123 | 7 1256 2568 |
*-----------------------------------------------------------------------------*
m-wing
(5=2)r7c9-r5c9=(2-5)r5c1=(5)r6c3 => r6c9,r7c3<>5

*--------------------------------------------------------------------*
| 178 1468 9 | 1478 2 145 | 156 1567 3 |
| 178 5 48 | 1478 3 6 | 12 9 247 |
| 137 1346 2 | 9 157 145 | 156 8 4567 |
|----------------------+----------------------+----------------------|
| 9 248 3 | 247 578 245 | 2568 2567 1 |
| 258 7 1 | 6 58 9 | 3 4 258 |
| 6 248 458 | 12347 1578 12345 | 9 257 278 |
|----------------------+----------------------+----------------------|
| 1235 9 7 | 123 6 8 | 4 125 25 |
| 128 128 68 | 5 4 7 | 1268 3 9 |
| 4 1238 568 | 123 9 123 | 7 1256 2568 |
*--------------------------------------------------------------------*
wing extended
(8=4)r2c3-r2c9=(4-6)r3c9=r9c9-r9c3=(6)r8c3 => r8c3<>8

*--------------------------------------------------------------------*
| 178 1468 9 | 1478 2 145 | 156 1567 3 |
| 178 5 48 | 1478 3 6 | 12 9 247 |
| 137 1346 2 | 9 157 145 | 156 8 4567 |
|----------------------+----------------------+----------------------|
| 9 248 3 | 247 578 245 | 2568 2567 1 |
| 258 7 1 | 6 58 9 | 3 4 258 |
| 6 248 458 | 12347 1578 12345 | 9 257 278 |
|----------------------+----------------------+----------------------|
| 1235 9 7 | 123 6 8 | 4 125 25 |
| 128 128 6 | 5 4 7 | 128 3 9 |
| 4 1238 58 | 123 9 123 | 7 1256 2568 |
*--------------------------------------------------------------------*
m-wing
(2=5)r7c9-r7c1=(5-2)r5c1=(2)r5c9 => r269c9<>2

*--------------------------------------------------------------------*
| 178 1468 9 | 1478 2 145 | 156 1567 3 |
| 178 5 48 | 1478 3 6 | 2 9 47 |
| 137 1346 2 | 9 157 145 | 156 8 4567 |
|----------------------+----------------------+----------------------|
| 9 248 3 | 247 578 245 | 568 2567 1 |
| 258 7 1 | 6 58 9 | 3 4 258 |
| 6 248 45 | 12347 1578 12345 | 9 257 78 |
|----------------------+----------------------+----------------------|
| 135 9 7 | 123 6 8 | 4 125 25 |
| 128 128 6 | 5 4 7 | 18 3 9 |
| 4 138 58 | 123 9 123 | 7 1256 568 |
*--------------------------------------------------------------------*
anp(58=2)r5c59-(2=5)r7c9-(5=1378)r1237c1-(8=45)r26c3 => r5c1<>5
stte

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Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Mon Apr 09, 2012 3:55 pm Post subject:

Good finds Dan. I try and systematically look for M-Wings, but obviously missed that one. Nice.

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