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Puzzle 11/02/18 BBDB ?

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Fri Feb 18, 2011 6:37 pm Post subject: Puzzle 11/02/18 BBDB ?

Code:

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

Play this puzzle online at the Daily Sudoku site

Marty R.

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

Posted: Sat Feb 19, 2011 2:54 am Post subject:

Another tough slog. Two ERs, maybe an XY-Wing (I forgot), Coloring, XY-Chain, UR and Remote Pairs.

peterj

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

Posted: Sat Feb 19, 2011 9:05 am Post subject:

Nice s-wing using an als strong link opened up by the x-wing ...

Code:

x-wing(4) c2, c9 ; r5c145<>4, r7c6<>4
s-wing-like(47) (4)r2c1=r4c1 - als(2347)r5c125[(4)r5c2=(7)r5c1] - (7)r4c3=r3c3 ; r2c1<>7, r3c3<>4
remotepair(34) ; r5c4<>3

Never sure how best to denote these als in Eureka - either end up belt & braces as above or too succinct that it is not clear later? Danny, what was your proposal (4=23=7)r5c251?

daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Sat Feb 19, 2011 2:33 pm Post subject:

peterj wrote:

Danny, what was your proposal (4=23=7)r5c251?

Yes, that's what I used until very recently. It described all of the candidates and cells involved. I still like it, but I'm also debating:

ALS(4=7)r5c251

... and ignore the intermediate information. This more closely resembles what others use, but I don't duplicate cell information because I use ordering in the list of cells attached to the ALS.

Regards, Danny

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