Strategies for Number Puzzles of all kinds
Caution!
Print Version
Solvers
Puzzles
Latest Apps
Str8ts
Other


Valid XHTML 4.01 Transitional


Discussion...


Post an idea here...
Your Name or Handle

Your comment, idea or question

Please enter the
letters you see:
arrow
Enter these letters
Remember me


Please keep your comments relevant to this puzzle.
Email addresses are never displayed, but they are required to confirm your comments. To state your solve time use the smaller form at the top right of this page." & vbNewLine & _ Line breaks and paragraphs are automatically converted ? no need to use <p> or <br> tags.

Sunday 8-Dec-2019

... by: Cenoman

New trial to post readable TM and net of my step 2.

As a triangular matrix

4G56 4HJ4
4D4 4D89
4HJ7 4E7 4C7
56BC7 5J7
6C7 6B7
6B5 5B5
5J4 5A4 5D4
8D4 8D9
8F7 9F7
9E78 9E6
4G6 4C6 4E6
-------
=>-4G89


...or as a net (*: endpoints)

(4-9)E6=E78-(9=8)F7-D9=(8-5)D4
|| ||
(5)C4-(5=6)B5-B7=(6)C7
|| || \
(5)J4-J7=(56)bC7- - - - (4)C7
|| / ||
(4)C6- - - - - - - - - - - - - - - - - - - - - (4)E7-D89=(4)G56*
|| ||
|| (4)HJ7*
(4)G6*
-------
=>-4G89

Sunday 8-Dec-2019

... by: Cenoman

WU#377 has a rating S.E. 11.0
JE2 (4568) HJ4, A5, D6
Eliminations from the pattern:
-48D6 (can't be true in opposite mirror node), -1B5, -3EF6 (in both cases, non base digit 9 locked in mirror nodes)

S.E. rating is now downgraded to 9.1
Puzzle no longer unsolvable. Andrew's solver fails nevertheless (ROOKS)
My own solver finds this complex interesting step, demonstrating that 4 is not a true base digit of the JE2:

Kraken column (4)CEG6
||(4)C6-C7=[(4)HJ7=E7-D89=D4-HJ4=G56]
||(4-9)E6=E78-(9=8)F7-D9=(8-5)D4=[(6)C7=b7-(6=5)b5-a4^=J4-J7=(56)bC7]-(4)C7=[(4)HJ7=E7-D89=D4-HJ4=G56]
||(4)G6
=>-4G89

Same as a triangular matrix
[pre]4G56 4HJ4
4D4 4D89
4HJ7 4E7 4C7
56BC7 5J7
6C7 6B7
6B5 5B5
5J4 5A4 5D4
8D4 8D9
8F7 9F7
9E78 9E6
4G6 4C6 4E6
-------
=>-4G89[/pre]

...or as a net (*: endpoints)
[pre]
(4-9)E6=E78-(9=8)F7-D9=(8-5)D4
|| ||
(5)C4-(5=6)B5-B7=(6)C7
|| || \
(5)J4-J7=(56)bC7- - - - (4)C7
|| / ||
(4)C6- - - - - - - - - - - - - - - - - - - - - (4)E7-D89=(4)G56*
|| ||
|| (4)HJ7*
(4)G6*
-------
=>-4G89[/pre]

4 is not a true base digit, then 4A5 and 4E6 can also be eliminated.
S.E. rating is now downgraded to 9.0
Puzzle now solvable by Andrew's solver.

The end of the solution is a long sequence of AIC's and krakens.
To escape this, a single trial of the 8s as a true base digit helps to easily solve the puzzle:
+8A5 & -8D4 =>contradiction (with basics)
Therefore true base digits are 5 & 6. +5J4 & +6H4 => puzzle solved with two AICs.

Saturday 7-Dec-2019

... by: Frans Goosens

With trial and error

Combination B5=156 and H2=679

************************************************************
B5=1 H2=6 No solution, Fixed

Combination 2-digits cells

E5=4 Wrong, Undo calculation
E5=6 Wrong, Undo calculation

All reset to initial position

************************************************************
B5=1 H2=7 No solution, Fixed

Combination 2-digits cells

E5=4 No solution, Undo calculation
E5=6 No solution, Undo calculation
F5=5 No solution, Undo calculation
F5=8 No solution, Undo calculation
F7=8 No solution, Undo calculation
F7=9 No solution, Undo calculation
G2=3 No solution, Undo calculation
G2=6 No solution, Undo calculation
I2=1 Wrong, Undo calculation
I2=9 No solution, Fixed

All reset to initial position

************************************************************
B5=1 H2=9 No solution, Fixed

Combination 2-digits cells

E5=4 No solution, Undo calculation
E5=6 No solution, Undo calculation
F5=5 Wrong, Undo calculation
F5=8 No solution, Fixed
F6=3 No solution, Undo calculation
F6=5 Wrong, Undo calculation
F6=3 No solution, Fixed
B6=5 Wrong, Undo calculation
B6=6 Wrong, Undo calculation

All reset to initial position

************************************************************
B5=5 H2=6 Wrong, Undo calculation

All reset to initial position

************************************************************
B5=5 H2=7 No solution, Fixed

Combination 2-digits cells

A4=4 Wrong, Undo calculation
A4=8 Wrong, Undo calculation

All reset to initial position

************************************************************
B5=5 H2=9 No solution, Fixed

Combination 2-digits cells

A4=4 Wrong, Undo calculation
A4=8 Wrong, Undo calculation

All reset to initial position

************************************************************
B5=6 H2=6 Wrong, Undo calculation

All reset to initial position

************************************************************
B5=6 H2=7 No solution, Fixed

Combination 2-digits cells

B4=1 No solution, Undo calculation
B4=7 Wrong, Undo calculation
B4=1 No solution, Fixed
B6=3 Wrong, Undo calculation
B6=5 Wrong, Undo calculation

All reset to initial position

************************************************************
B5=6 H2=9 No solution, Fixed

Combination 2-digits cells

B4=1 No solution, Undo calculation
B4=7 Wrong, Undo calculation
B4=1 No solution, Fixed
B6=3 ( C3=8 ) Solved,


#377--------------------------Solution
100 002 700-------------163 852 749
040 000 080-------------749 163 582
000 090 000-------------528 794 631

900 070 300-------------952 476 318
080 000 005-------------687 319 425
004 200 060-------------314 285 967

200 900 100-------------276 948 153
005 031 000-------------895 631 274
000 027 006-------------431 527 896

Total solving time is : 593 sec.
Number of logical steps is : 62619

Saturday 7-Dec-2019

... by: James Havard

My solver found 3 together for a singles solution
B4=1, G9=3, and H9=4.

Saturday 7-Dec-2019

... by: SuDokuFan

After the JE found by BobW and Andrew’s solver, rather than using Bob’s proof of which mirrors contain the digit 9 (your GE is the same as Andrew’s JE just using different base cells), I found the GE 3459A89, C6, B3 which also solves the puzzle

Saturday 7-Dec-2019

... by: BobW

JExocet 4568 HJ4, A5 D6; Eliminations: -48D6 -1B5 -3E6 -3F6

GExocet: 4568 AB5, F6 H4; Eliminations: -9F6

JExocet 4568 HJ4, A5 D6; Additional Eliminations: -4H4 -4J4 -4A5

12 messy inference chains/nets

JExocet: 568 HJ4, A5 D6; Eliminations: -6A5

2 more inference chains/nets

Then basics to end.

Archive

Each week a new 'unsolvable' will be published and the previous will be accessible here from this archive section. If you like very tough puzzles, these are for you.
Share and Enjoy




Page created on 03-May-2011, last modified on 21-Nov-2019.
All puzzles on this site are trademarked and copyright
and cannot be reproduced without permission.
Copyright Syndicated Puzzles Inc, 2011-2019