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Puzzle NR 09/12/17 (B)

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Thu Dec 17, 2009 5:06 pm Post subject: Puzzle NR 09/12/17 (B)

Code:

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

Play this puzzle online at the Daily Sudoku site

tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Fri Dec 18, 2009 1:03 am Post subject:

Quote:

UR 18 r28c79. To prevent the deadly pattern, r28c9=3 or r8c9=7.
(3)r28c9 - (3=3)r7c9,
(7)r8c9 - (7=3)r8c4 - (3)r9c4 = (3)r9c8 - (3=8)r7c9.

Thus r7c9=8 to complete the puzzle.

Ted

Marty R.

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

Posted: Sat Dec 19, 2009 1:56 am Post subject:

A useless ER on 6, then a Type 4 UR on 18 exposed a puzzle-ending XY-Wing on 138.

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