dailysudoku.com :: View topic - Puzzle 10/06/11: (B) Advanced (corrected)

dailysudoku.com
Discussion of Daily Sudoku puzzles

FAQ

Memberlist

Usergroups

Profile

Puzzle 10/06/11: (B) Advanced (corrected)

dailysudoku.com Forum Index -> Puzzles by daj

View previous topic :: View next topic

Author

Message

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Fri Jun 11, 2010 2:34 pm Post subject: Puzzle 10/06/11: (B) Advanced (corrected)

Code:

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

Play this puzzle online at the Daily Sudoku site

Code:

after basics
+--------------------------------------------------------------+
| 5 4 8 | 137 167 1367 | 2 9 137 |
| 79 1 379 | 5 2 8 | 4 6 37 |
| 6 37 2 | 1379 4 1379 | 8 5 137 |
|--------------------+--------------------+--------------------|
| 12 379 37 | 4 19 123 | 5 8 6 |
| 12 39 4 | 6 8 5 | 13 7 29 |
| 8 6 5 | 137 179 1237 | 13 4 29 |
|--------------------+--------------------+--------------------|
| 3 5 1 | 8 67 67 | 9 2 4 |
| 4 2 6 | 19 5 19 | 7 3 8 |
| 79 8 79 | 2 3 4 | 6 1 5 |
+--------------------------------------------------------------+
# 48 eliminations remain

tlanglet

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

Posted: Fri Jun 11, 2010 6:00 pm Post subject:

Another interesting sequence of steps..........

Quote:

Type 3 UR19 r38c46 forms NP37; r3c9<>37
Type 1 UR79 r29c13; r2c3<>79
Type 2 UR67 r17c56
BUG+1 forces r4c6=1

Ted

peterj

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

Posted: Fri Jun 11, 2010 6:12 pm Post subject:

A short one-step xy-chain... with a sort of w-wing shape. Are xy-chains in the "advanced" category?

Quote:

xy-chain (9=1)r4c5-(1=2)r4c1-(2=1)r5c4-(1=3)r5c8-(3=9)r5c2; r4c2<>9
or
(9=1)r4c5-r4c1=r5c1-(1=39)r5c27

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Fri Jun 11, 2010 6:18 pm Post subject:

peterj wrote:

Are xy-chains in the "advanced" category?

No, they're in a higher rating. However, few puzzles are solved using the category/rating that my solver used to solve them.

tlanglet

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

Posted: Fri Jun 11, 2010 6:35 pm Post subject:

peterj wrote:

Are xy-chains in the "advanced" category?

Peter,

For you info, here is the grouping of "Difficulty of Techniques" as posted by Danny.

Ted

peterj

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

Posted: Fri Jun 11, 2010 10:32 pm Post subject:

daj95376 wrote:

peterj wrote:

Are xy-chains in the "advanced" category?

No, they're in a higher rating. However, few puzzles are solved using the category/rating that my solver used to solve them.

Thought so, but I struggle to understand why a 4 cell xy-chain counts as super-advanced when it is one tiny step beyond an xy-wing? To me these are natural patterns to check out when the grid has "enough" bivalues.

I can see why a general AIC which mixes strong links on conjugates and strong links on bivalues, perhaps with a few ANS moves thrown in, is 'super advanced' ... but not a simple xy-chain.

If your sole motivation with this game was solving puzzles, then colouring and xy-chains would get you a long way!

Marty R.

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

Posted: Sun Jun 13, 2010 1:53 am Post subject:

Very similar to Ted's. Type 1 UR (79) Type 2 UR (19-3) Type 2 UR (67-1) BUG+1

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