dailysudoku.com :: View topic - Puzzle 11/02/07 Hmmm!!!

dailysudoku.com
Discussion of Daily Sudoku puzzles

FAQ

Memberlist

Usergroups

Profile

Puzzle 11/02/07 Hmmm!!!

dailysudoku.com Forum Index -> Puzzles by daj

View previous topic :: View next topic

Author

Message

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Mon Feb 07, 2011 9:12 am Post subject: Puzzle 11/02/07 Hmmm!!!

Code:

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

Play this puzzle online at the Daily Sudoku site

Marty R.

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

Posted: Tue Feb 08, 2011 5:51 am Post subject:

Quote:

Type 1 UR (79)
XY-Wing, flightless with transport; r3c2<>2
Another transport; r1c2<>2
Remote Pairs (79); r6c2<>7

peterj

Joined: 26 Mar 2010
Posts: 974
Location: London, UK

Posted: Tue Feb 08, 2011 9:12 am Post subject:

I'd be stretching my "m-wing-like" label a bit far on this one... so just a chain

Quote:

(9=2)r5c3-(2=8)r7c3 - r7c2=(8-9)r3c2=r3c5 - r6c5=r6c8

.. a pseudo-cell m-wing-like(89) with transport Smile

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Tue Feb 08, 2011 4:21 pm Post subject:

I didn't know how to mark this puzzle. It has a two-stepper solution, but missing it leads to a difficult BBDB.

Code:

after basics
+--------------------------------------------------------------+
| 1 279 5 | 79 2379 379 | 8 6 4 |
| 27 6 3 | 4 1 8 | 279 5 79 |
| 278 2789 4 | 6 279 5 | 27 3 1 |
|--------------------+--------------------+--------------------|
| 478 5 89 | 2 379 379 | 1 479 6 |
| 247 3 29 | 1 8 6 | 79 2479 5 |
| 6 27 1 | 5 79 4 | 3 279 8 |
|--------------------+--------------------+--------------------|
| 5 28 28 | 3 6 1 | 4 79 79 |
| 3 1 6 | 79 4 79 | 5 8 2 |
| 9 4 7 | 8 5 2 | 6 1 3 |
+--------------------------------------------------------------+
# 46 eliminations remain

Two-stepper: (Peter came sooooo close.)

Code:

M-Wing 4A: (2=9)r5c3 - r5c7 = (9-2)r2c7 = (2)r2c1 => r5c1<>2

RP: (7=9)r1c2 - (9=7)r1c4 - (7=9)r3c5 - (9=7)r6c5 => r6c2<>7

BBDB:

Code:

r18c46 <79> UR Type 1.2223 <> 79 r1c6

<29+7> XY-Wing r5c3/r5c7+r6c2 <> 7 r5c1,r6c8

r16\c25 finned X-Wing <> 7 r3c5 -or-
r6 b2 Empty Rectangle <> 7 r1c2

<27+9> XY-Wing r6c2/r1c2+r6c5 <> 9 r1c5 extraneous
<79+2> XY-Wing r6c5/r3c5+r6c2 <> 2 r3c2 extraneous

+--------------------------------------------------------------+
| 1 29 5 | 79 27 3 | 8 6 4 |
| 27 6 3 | 4 1 8 | 279 5 79 |
| 278 789 4 | 6 29 5 | 27 3 1 |
|--------------------+--------------------+--------------------|
| 478 5 89 | 2 3 79 | 1 49 6 |
| 24 3 29 | 1 8 6 | 79 2479 5 |
| 6 27 1 | 5 79 4 | 3 29 8 |
|--------------------+--------------------+--------------------|
| 5 28 28 | 3 6 1 | 4 79 79 |
| 3 1 6 | 79 4 79 | 5 8 2 |
| 9 4 7 | 8 5 2 | 6 1 3 |
+--------------------------------------------------------------+
# 33 eliminations remain

XY-Chain: (9=7)r4c6 (=9)r6c5 (=2)r3c5 (=7)r3c7 (=9)r5c7 => r4c8<>9

Display posts from previous:

	dailysudoku.com Forum Index -> Puzzles by daj	All times are GMT
Page 1 of 1

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum