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Puzzle 10/02/28 (B)

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sun Feb 28, 2010 5:27 pm Post subject: Puzzle 10/02/28 (B)

Not a single-stepper XYZ-Wing.

Code:

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

Play this puzzle online at the Daily Sudoku site

tlanglet

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

Posted: Mon Mar 01, 2010 5:48 am Post subject:

I tried this puzzle twice. Both times I used seven steps finishing with the same BUG+1 although the other six steps with mostly different. FUN! Ted

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Mon Mar 01, 2010 6:18 pm Post subject:

Code:

.---------------------.---------------------.---------------------.
| 7 12 9 | 256 156 126 | 3 4 8 |
| 26 8 16 | 3 14 124 | 79 79 5 |
| 5 3 4 | 9 8 7 | 6 2 1 |
:---------------------+---------------------+---------------------:
| 269 4 7 | 1 69 2689 | 5 689 3 |
| 369 5 16 | 468 7 34689 | 189 1689 2 |
| 2369 12 8 | 26 369 5 | 179 1679 4 |
:---------------------+---------------------+---------------------:
| 4 9 5 | 7 13 138 | 2 18 6 |
| 8 6 2 | 45 1459 149 | 14 3 7 |
| 1 7 3 | 468 2 468 | 48 5 9 |
'---------------------'---------------------'---------------------'

#1.als version of the w-wing...als[(2)r1c26 = (6)r1c6]r1c26 - (6)r9c6 = (6)r9c4 - (6=2)r6c4; r1c4 <> 2
#2.(9=3)r5c1 - (3)r5c6 = (3)r7c6 - (3=1)r7c5 - (1)r7c8 = (1)r5c8; r5c8 <> 9

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Fri Mar 05, 2010 5:47 pm Post subject:

Code:

c24 X-Wing <> 2 r1c6,r6c1 -or-
r24 X-Wing <> 2 r1c6,r6c1
-and-
c47 X-Wing <> 8 r5c68,r9c6 -or-
r47 X-Wing <> 8 r5c68,r9c6

<16+4> XY-Wing r1c6/r2c5+r9c6 <> 4 r2c6,r8c5
<12+6> XY-Wing r6c2/r5c3+r6c4 <> 6 r5c46,r6c1

r26c78 <79> UR Type 4 <> 9 r6c78

<68+4> XYZ-Wing r9c4/r5c4+r9c6 <> 4 r8c4

BUG+1 = 9 r5c6

I don't recall if all steps are necessary.

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