Extreme 2

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Extreme 2

Postby morl » Mon May 21, 2018 6:29 pm

Code: Select all
+-------+-------+-------+
| . . . | 3 . 9 | . . . |
| 3 4 . | . . . | 8 . . |
| . . 5 | . . . | . 7 . |
+-------+-------+-------+
| . 9 . | . . 1 | . . 6 |
| . . 6 | . . . | . 5 . |
| . . . | . 8 . | 4 . . |
+-------+-------+-------+
| 9 . . | 5 . . | 2 . . |
| . 8 . | . 4 . | . 1 . |
| . . 7 | . . 3 | . . . |
+-------+-------+-------+

Link

...3.9...34....8....5....7..9...1..6..6....5.....8.4..9..5..2...8..4..1...7..3...

Have fun!
morl
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Posts: 41
Joined: 12 February 2018

Re: Extreme 2

Postby Leren » Tue May 22, 2018 1:47 am

Wow ! What a stinker. There are no single candidate elimination opportunities and apart from a Skyscraper, nothing else would work short of Forcing Chains.

I thought it was just me, so I put into Hodoku and its solution included no less than twenty Forcing Chain moves - surely a record.

Perhaps the rating experts can tell us the rating of this puzzle. Leren
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Posts: 3312
Joined: 03 June 2012

Re: Extreme 2

Postby totuan » Sun Jun 17, 2018 3:42 am

Hi All,
Wait too long to find time for Sudoku and Wold Cup… :D :D :D

The puzzle after SSTS (included colors for 9’s => r5c79<>9)
Code: Select all
 *--------------------------------------------------------------------*
 | 12678  1267   128    | 3      1256   9      | 156    246    1245   |
 | 3      4      9      | 1267   12567  2567   | 8      26     125    |
 | 126    126    5      | 48     126    48     | 39     7      39     |
 |----------------------+----------------------+----------------------|
 | 24578  9      2348   | 247    2357   1      | 37     238    6      |
 | 12478  1237   6      | 2479   2379   247    | 137    5      12378  |
 | 1257   12357  123    | 267    8      2567   | 4      239    12379  |
 |----------------------+----------------------+----------------------|
 | 9      136    134    | 5      167    678    | 2      3468   3478   |
 | 256    8      23     | 2679   4      267    | 35679  1      3579   |
 | 12456  1256   7      | 12689  1269   3      | 569    4689   4589   |
 *--------------------------------------------------------------------*

Thanks for the puzzle. My part for this one (ER9.1), hope a better from others.
Look at AUR(39)r38c79 => (3)r8c3=(9)r8c4

01: Present as diagram: => r6c2<>5, r9c2=5
Code: Select all
(3)r5c2-r5c5=(3-5)r4c5=r4c1
 ||
(3)r6c2
 ||
(3)r7c2-AUR(39)r38c79[(3)r8c3=(9)r8c4]-r5c4=(9-3)r5c5=(3-5)r4c5=r4c1

02: Present as diagram: => r4c8<>3
Code: Select all
(3)r7c8
 ||
(3-7)r7c9=(57-9)r8c79=(9)r8c4-------------(9)r5c4=(9-3)r5c5=r4c5
 ||                                 |
(3)r7c23-(3=267)r8c136-(267=9)r8c4-

03: (3=267)r8c136-(267=9)r8c4-(9)r5c4=(9-3)r5c5=r4c5 => r4c3<>3
04: (3)r56c2=r7c2-r7c8=r6c8 => r6c3<>3

05: Present as diagram: => r7c3<>3, r8c3=3
Code: Select all
(2)r4c4----(2)r5c6
 ||         ||
 ||        (7)r5c6-(7=26)r8c16-(2=3)r8c3
 ||         ||
 ||        (4)r5c6-(4=8)r3c6-r3c4=r9c4-(8=469)r9c789-(4)r9c1=r7c3
 ||
(4)r4c4-r4c3=r7c3
 ||
(7)r4c4-(7=3)rr4c7-r6c8=r7c8

06: (3)r8c8=r8c9-(3=9)r3c9-r6c9=r6c8 => r6c8<>3, r7c8=3

07: Present as diagram: => r4c4<>7
Code: Select all
(4)r4c4
 ||
(4)r5c6-(4=8)r3c6-r3c4=r9c4-(8=469)r9c789-(9)r8c79=r8c4-r5c4=(9-3)r5c5=r4c5-(3=7)r4c7
 ||
(4-9)r5c4=(9-3)r5c5=r4c5-(3=7)r4c7

08: (2=8)r4c8-r4c3=(8-2)r1c3=r6c3 => r6c8<>2, r6c8=9
09: (8)r9c8=r4c8-r5c9=(8-4)r5c1=r9c1 => r9c8<>4, r1c8=4

10: Present as diagram: => r4c4<>2, stte
Code: Select all
(2)r56c6
 ||
(2)r8c6-r8c1=(2-4)r9c1=r7c3-r4c3=r4c4
 ||
(2)r2c6-r2c8=r4c8


totuan
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