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MM #1419 and 1421

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storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Mon Jun 01, 2009 9:20 pm Post subject: MM #1419 and 1421

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#1419

Code:

+-------+-------+-------+
| . . 6 | . 8 . | . . . |
| 8 . 5 | 2 . 4 | . 7 9 |
| 2 . . | . . . | . 3 . |
+-------+-------+-------+
| 5 . . | . . . | . 6 . |
| . . . | 9 . 3 | 2 . . |
| . 2 . | . . . | . . 7 |
+-------+-------+-------+
| . . . | . . . | . . 6 |
| 4 7 . | 8 . 2 | 1 . 3 |
| . . . | . 3 . | 4 . . |
+-------+-------+-------+

open in Draw/Play page

#1421

Code:

+-------+-------+-------+
| 2 . . | 5 . 6 | . 1 4 |
| . . . | . . 4 | . . . |
| . . 7 | . 1 . | 9 . . |
+-------+-------+-------+
| . 9 . | . 6 . | 7 5 . |
| . . 2 | . . . | 6 . . |
| . 7 1 | . 8 . | . 2 . |
+-------+-------+-------+
| . . 8 | . 3 . | 5 . . |
| . . . | 4 . . | . . . |
| 9 4 . | 1 . 8 | . . 7 |
+-------+-------+-------+

open in the Draw/Play page

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Marty R.

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

Posted: Fri Jun 05, 2009 5:02 am Post subject:

1419 had two ERs and a Type 4 UR which I don't remember if it was needed.

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storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Fri Jun 05, 2009 6:52 am Post subject:

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#1421 isn't so obvious
but this is probably the most direct route.
after basics

Code:

.---------------------.---------------------.---------------------.
| 2 38 9 | 5 7 6 | 38 1 4 |
| 1358 13568 356 | 2389 29 4 | 238 7 256 |
| 4 3568 7 | 238 1 23 | 9 36 256 |
:---------------------+---------------------+---------------------:
| 38 9 4 | 23 6 123 | 7 5 138 |
| 358 358 2 | 7 4 139 | 6 89 1389 |
| 6 7 1 | 39 8 5 | 4 2 39 |
:---------------------+---------------------+---------------------:
| 17 12 8 | 6 3 279 | 5 4 29 |
| 357 2356 356 | 4 259 279 | 1 89 2689 |
| 9 4 56 | 1 25 8 | 23 36 7 |
'---------------------'---------------------'---------------------'

skyscraper 9
gets it to here.

Code:

.---------------------.---------------------.---------------------.
| 2 *38 9 | 5 7 6 |*38 1 4 |
| 1358 13568 *356 | 238 9 4 | 238 7 256 |
| 4 3568 7 | 238 1 23 | 9 36 256 |
:---------------------+---------------------+---------------------:
| 38 9 4 | 23 6 123 | 7 5 18 |
| 358 358 2 | 7 4 13 | 6 89 189 |
| 6 7 1 | 9 8 5 | 4 2 3 |
:---------------------+---------------------+---------------------:
| 17 12 8 | 6 3 79 | 5 4 29 |
| 357 2356 *35-6 | 4 25 79 | 1 89 2689 |
| 9 4 *56 | 1 *25 8 |*23 36 7 |
'---------------------'---------------------'---------------------'

(6=5)r9c3 - (5=2)r9c5 - (2=3)r9c7 - (3)r1c7 = (3)r1c2 - (3)r2c3 = (3)r8c3; r8c3 <> 6

leads to a xy-wing {2,5,6} pivot cell r8c2, removes 5 from r9c5 and r8c13

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Marty R.

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

Posted: Sun Jun 07, 2009 5:06 am Post subject:

On 1421 I used a Hidden UR (23), ER (9)and a DP 18-13-38. On the first pass, one of the DP killers was invalid and that then left just one candidate to kill it which finished it off.

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