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Puzzle VH_033

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sun May 31, 2009 11:01 pm Post subject: Puzzle VH_033

Code:

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

Play this puzzle online at the Daily Sudoku site

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Mon Jun 01, 2009 9:00 am Post subject:

after basics.

Code:

.------------------.------------------.------------------.
| 8 15 157 | 4 9 6 | 2 3 57 |
| 49 2 56 | 3 7 8 | 56 1 49 |
| 34 69 37 | 5 1 2 | 8 69 47 |
:------------------+------------------+------------------:
| 6 4 2 | 1 8 7 | 35 59 359 |
| 1 7 8 | 9 5 3 | 4 2 6 |
| 5 3 9 | 6 2 4 | 1 7 8 |
:------------------+------------------+------------------:
| 7 68 4 | 2 3 5 | 9 68 1 |
| 2 1568 1356 | 78 4 9 | 3567 568 35 |
| 39 589 35 | 78 6 1 | 357 4 2 |
'------------------'------------------'------------------'

the xy-wing would be true if the 8 in r9c2 is false

Code:

+----------+-------+-------+
| . . . | . . . | . . . |
| . . 56 | . . . | . . . |
| . 69 . | . . . | . . . |
+----------+-------+-------+
| . . . | . . . | . . . |
| . . . | . . . | . . . |
| . . . | . . . | . . . |
+----------+-------+-------+
| . . . | . . . | . . . |
| . . . | . . . | . . . |
| . 589 . | . . . | . . . |
+----------+-------+-------+

---

Code:

.------------------.------------------.------------------.
| 8 15 157 | 4 9 6 | 2 3 57 |
|*49 2 *56 | 3 7 8 | 56 1 *49 |
| 34 *69 37 | 5 1 2 | 8 *69 47 |
:------------------+------------------+------------------:
| 6 4 2 | 1 8 7 | 35 *59 359 |
| 1 7 8 | 9 5 3 | 4 2 6 |
| 5 3 9 | 6 2 4 | 1 7 8 |
:------------------+------------------+------------------:
| 7 68 4 | 2 3 5 | 9 *68 1 |
| 2 1568 1356 | 78 4 9 |*3567 568 35 |
|*39 *589 *35 | 78 6 1 | 357 4 2 |
'------------------'------------------'------------------'

(8)r9c2 = xy-wing[(59)r9c2, (69)r3c2, (56)r2c3] - (5=3)r9c3 - (3=9)r9c1 - (9)r2c1 = (9)r2c9 - (9)r3c8 = (9-5)r4c8 = (5-8)r8c8 = (8)r7c8; r7c2 <> 8

arkietech

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

Posted: Mon Jun 01, 2009 1:32 pm Post subject:

Best I could do was three steps:

Quote:

w-wing 35 on 5
er 5
xy-wing 561

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