dailysudoku.com Forum Index dailysudoku.com
Discussion of Daily Sudoku puzzles
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

One from Ted

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles
View previous topic :: View next topic  
Author Message
Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Wed Sep 08, 2021 12:35 pm    Post subject: One from Ted Reply with quote
Have fun.

Code:
+-------+-------+-------+
| . . . | 4 5 . | . 2 . |
| 3 9 . | . 7 . | . 4 . |
| . . 5 | . . 2 | 1 . . |
+-------+-------+-------+
| . . 6 | . . . | . . 2 |
| 5 1 . | . . . | . 7 9 |
| 9 . . | . . . | 5 . . |
+-------+-------+-------+
| . . 7 | 6 . . | 8 . . |
| . 5 . | . 2 . | . 3 6 |
| . 6 . | . 3 8 | . . . |
+-------+-------+-------+
Back to top
View user's profile Send private message
immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Thu Sep 09, 2021 4:15 pm    Post subject: Reply with quote
Wow, great puzzle Mogulmeister. EXTREME! Will be interested to see what folks come up with for one step solutions. I couldn't do it. Saw multiple ALS scenarios, among other things, though. Challenging puzzle to be sure.

cheers...immp
Back to top
View user's profile Send private message
dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Sat Sep 11, 2021 2:23 pm    Post subject: Reply with quote
This one was too tough for me! I couldn't even find the possibility of a single step solution! I did see some back door solutions but of course they're no help when you're trying to solve it properly.
Back to top
View user's profile Send private message
Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Sat Sep 11, 2021 2:41 pm    Post subject: Reply with quote
It is very tough. Multi steps welcome.
Back to top
View user's profile Send private message
Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Mon Sep 13, 2021 4:14 pm    Post subject: One from Ted Reply with quote
Opted for a two stepper
Code:

+----------------------+----------------------+-------------------+
| 1678    78     e18   | 4       5       369  |a79     2      378 |
| 3       9       2    | 8       7       1    | 6      4      5   |
| 4678    478     5    | 39      69      2    | 1     i8-9    378 |
+----------------------+----------------------+-------------------+
|g478    g478     6    | 1359    1489    3459 | 34    h18     2   |
| 5       1      f348  | 2       468     346  | 34     7      9   |
| 9       2      f348  | 137     148     347  | 5      6      18  |
+----------------------+----------------------+-------------------+
| 2       3       7    | 6      c149    c459  | 8     b159   b14  |
| 148     5      e1489 | 179     2      d4*79 |b79*    3      6   |
| 14      6       149  | 1579    3       8    | 2     b159    147 |
+----------------------+----------------------+-------------------+

Step 1: (9)r1c7 = (91|54)b9p4283 – (4)r7c56 = (4*)r8c6 – (4*9*=1|8)r81c3 – (8)r56c3 = r4c12 – r4c8 = (8)r3c8 => - 9r3c8
Code:

+-----------------------+--------------------+-----------------+
| 1678     78      e18  | 4      5      b36  | 9      2     37 |
| 3        9        2   | 8      7       1   | 6      4     5  |
| 467      47       5   |a39     69      2   | 1      8     37 |
+-----------------------+--------------------+-----------------+
| 478      478      6   | 5      89      349 | 34     1     2  |
| 5        1       e348 | 2     d68     c346 | 34     7     9  |
| 9        2        34  | 13     14      7   | 5      6     8  |
+-----------------------+--------------------+-----------------+
| 2        3        7   | 6      14      5   | 8      9     14 |
| 148      5       e148 | 1-9    2      f49  | 7      3     6  |
| 14       6        9   | 7      3       8   | 2      5     14 |
+-----------------------+--------------------+-----------------+

Step 2: (9=3)r3c4 – (3=6)r1c6 – r5c6 = (6-8)r5c5 = (814)r518c3 – (4=9)r8c6 => - 9r8c4; stte
Back to top
View user's profile Send private message AIM Address
dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Mon Sep 13, 2021 7:20 pm    Post subject: Reply with quote
Wow! Nice job Clement!
Back to top
View user's profile Send private message
Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Wed Sep 15, 2021 9:09 am    Post subject: Reply with quote
dongrave wrote:
Wow! Nice job Clement!
Thanks dongrave
Back to top
View user's profile Send private message AIM Address
Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Thu Sep 16, 2021 8:50 am    Post subject: Reply with quote
This was Ted’s solve in his own words:

“I had another three step solution then reduced it to two steps

xy-wing (79-8)r1c72+r3c8; r1c9,r3c12<>8

AUR(47)r34c12 SIS r3c1=6, r4c12=8
(9=6)r3c5-AUR (47)r34c12[(6)r3c1=(8)r4c12]-r4c8=(8-9)r3c8=r1c7; r1c6,r3c8<>9

(4)r9c1=(4)r9c9-r7c9=r7c5-r6c5=r6c3; r8c3<>4

Note that xy-wing is not necessary:
AUR(47)r34c12 SIS r3c1=6, r34c12=8; r1c6,r3c8<>9
(6)r3c1-(6=9)r3c5
||
(8)r3c12-(8=7=9)r1c27
||
(8)r4c12-r4c8=(8-9)r3c8=r1c7 “

Ted
Back to top
View user's profile Send private message
Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Thu Sep 16, 2021 8:55 am    Post subject: Reply with quote
Eureka note - here Ted has used (9) single number in brackets to indicate “is 9”. It is used also to indicate “not 9” at the start of some Eureka chains.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles All times are GMT
Page 1 of 1

 
Jump to:  
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


Powered by phpBB © 2001, 2005 phpBB Group