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emm
Hooked

Joined: 11 Oct 2006
Posts: 34

 Posted: Sun Dec 24, 2006 7:53 am    Post subject: X-Treme Dec 23 Just for the record I am actually having a little bit of trouble with X-Treme Dec 23 - but I'm sure I would be able to solve it if it wasn't Christmas and I had more time. I'll have another go when all the eating and drinking is over. In the meantime thanks Ruud for lots of fun on your forum. Happy Christmas from Downunder!
emm
Hooked

Joined: 11 Oct 2006
Posts: 34

Posted: Thu Dec 28, 2006 6:56 am    Post subject: X-Treme Dec 23

It has been fairly torrid getting to this point - I have used uniqueness and a lot of contradiction chains -

 Code: *--------------------------------------------------*  | 2    14   134  | 7    9    5    | 8    34   6    |  | 7    8    34   | 6    34   1    | 9    5    2    |  | 9    5    6    | 38   2    48   | 34   7    1    |  |----------------+----------------+----------------|  | 36   13   15   | 9    56   28   | 7    28   4    |  | 48   2    7    | 48   1    3    | 5    6    9    |  | 46   9    58   | 248  56   7    | 1    28   3    |  |----------------+----------------+----------------|  | 5    6    9    | 23   8    24   | 34   1    7    |  | 1    7    2    | 5    34   9    | 6    34   8    |  | 38   34   48   | 1    7    6    | 2    9    5    |  *--------------------------------------------------*

Almost a BUG but not quite. Any ideas?
sudokuEd
Grandmaster

Joined: 19 Jun 2006
Posts: 257
Location: Sydney Australia

Posted: Thu Dec 28, 2006 12:13 pm    Post subject:

An ALS move unlocks the puzzle emm

ALS(A=[r9c1,r4c6]B=[r356c4], X = 2, Z= 3) -> r3c7<>3

But I can't get as far as emm has. Any more ideas?
 Code: .---------------.---------------.---------------. | 234  1234 134 | 7    9    5   | 8    34   6   | | 7    8    34  | 6    34   1   | 9    5    2   | | 9    5    6   | 38   2    48  | 34   7    1   | :---------------+---------------+---------------: | 36   13   135 | 29   56   289 | 7    28   4   | | 248  24   7   | 248  1    3   | 5    6    9   | | 46   249  4589| 248  56   7   | 1    28   3   | :---------------+---------------+---------------: | 5    6    29  | 239  8    24  | 34   1    7   | | 1    7    234 | 5    34   249 | 6    349  8   | | 348  349  3489| 1    7    6   | 2    349  5   | '---------------'---------------'---------------'

Last edited by sudokuEd on Fri Dec 29, 2006 3:32 am; edited 1 time in total
Ruud
Site Owner

Joined: 30 Dec 2005
Posts: 601

Posted: Thu Dec 28, 2006 6:29 pm    Post subject:

you could start with the X-Wing for digit 4 in r37c67...

then there is this nice loop:

[r9c1]-8-[r4c6]=8=[r3c6]=4=[r3c7]=3=[r9c1] => r9c1<>8

several singles bring you to this point:

 Code: .------------.------------.------------. | 2  1-34 134| 7   9   5  | 8  *34  6  | | 7   8   34 | 6   34  1  | 9   5   2  | | 9   5   6  | 38  2   48 |*34  7   1  | :------------+------------+------------: | 36  13  135| 9   56  28 | 7   28  4  | | 8   2   7  | 4   1   3  | 5   6   9  | | 46  9   45 | 28  56  7  | 1   28  3  | :------------+------------+------------: | 5   6   9  | 23  8   24 | 34  1   7  | | 1   7   2  | 5   34  9  | 6   34  8  | |*34 *34  8  | 1   7   6  | 2   9   5  | '------------'------------'------------'

A remote pair using the diagonal causes a single 1 in r1c2.

That finally cracks it.

Ruud
_________________
“If the human brain were so simple that we could understand it, we would be so simple that we couldn't.” - Emerson M Pugh
emm
Hooked

Joined: 11 Oct 2006
Posts: 34

 Posted: Thu Dec 28, 2006 8:03 pm    Post subject: Very nice moves. Looks so easy when someone shows you how. Thanks!
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