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Set XY_03 Puzzle 032

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Thu Aug 06, 2009 7:39 am Post subject: Set XY_03 Puzzle 032

Code:

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

Play this puzzle online at the Daily Sudoku site

tlanglet

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

Posted: Fri Aug 07, 2009 1:53 am Post subject:

A fun three step puzzle:

Quote:

x-wing 2,
w-wing 13,
skyscraper 9.

Ted

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Fri Aug 07, 2009 2:02 am Post subject:

x-wing on 2 gets pretty far, to here...

Code:

.------------------.------------------.------------------.
| 1 3 8 | 2 5 4 | 7 9 6 |
| 5 4 7 | 8 9 6 | 3 1 2 |
| 2 6 9 |*13 7 *13 | 8 5 4 |
:------------------+------------------+------------------:
| 79 179 3 | 5 4 179 | 6 2 8 |
| 4 159 6 |*139 8 2 |*19 7 35 |
| 8 1579 2 | 6 13 *1379 |*19 4 35 |
:------------------+------------------+------------------:
| 6 79 5 | 4 13 139 | 2 8 17 |
| 79 2 4 | 19 6 8 | 5 3 17 |
| 3 8 1 | 7 2 5 | 4 6 9 |
'------------------'------------------'------------------'

marked in the grid is a BUGlite pattern that cannot exist.
here...

Code:

+-------+---------+--------+
| . . . | . . . | . . . |
| . . . | . . . | . . . |
| . . . | 13 . 13 | . . . |
+-------+---------+--------+
| . . . | . . . | . . . |
| . . . | 39 . . | 19 . . |
| . . . | . . 39 | 19 . . |
+-------+---------+--------+
| . . . | . . . | . . . |
| . . . | . . . | . . . |
| . . . | . . . | . . . |
+-------+---------+--------+

in box 5, the 3 in r6c5 and the 9 in r4c6 can't both be false or the {3,9} candidates are forced to exist in the pattern cells.
BUGlite{139}[(9)r4c6 = (3)r6c5]

the chain can be formed...

BUGlite{139}[(9)r4c6 = (3)r6c5] - (3=1)r7c5 - (1=9)r8c4; r7c6 <> 9

Marty R.

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

Posted: Fri Aug 07, 2009 4:02 am Post subject:

Great fun, even though I took about triple the number of steps that were needed, ending with a W-Wing on 13.

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