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Str8ts - it's not Sudoku
1 TO 25 - quick but tricky, play now

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Is this right?
[6, 2, 5, 1, 7, 8, 9, 4, 3]
[9, 4, 8, 3, 2, 6, 1, 5, 7]
[3, 7, 1, 9, 4, 5, 8, 6, 2]
[2, 5, 7, 6, 1, 9, 3, 8, 4]
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[1, 8, 9, 4, 3, 2, 5, 7, 6]
[7, 9, 2, 8, 6, 3, 4, 1, 5]
[5, 1, 6, 2, 9, 4, 7, 3, 8]
[8, 3, 4, 7, 5, 1, 6, 2, 9]


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... by: JULIEN

ok I did this Sudoku but there is a mistake and it is why it is impossible, the 9 in b1 should be at c2 therefore 7 c2 should be at b1. here the solution without the misplacement of this 2 number:

this is the one and only solution, the person who did invent this Sudoku put an error to be impossible...
but now with this 2 number put back at their right place now it is possible ( see result above).

it took me 4 hours but I find it.

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Sunday 5-May-2013

... by: newby

first finding all the 3 number sets, (3,5,8)C7 was most interesting as it offered the most paired sets using 8C7.
The using pairs (2,9)J8,J9; (1,8)H9,G8; (4,7)G7, H7
9J9, 8H9, 7H7 solves!!

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Thursday 5-Jul-2012

... by: marcel hendrix

This one takes 0.061 ms to solve. That is not much, compared to 2.5 ms for Arto Inkala's idea, or some samples from sudoku17.txt (326 ms for line 527, 989 ms for line 6361).


Thursday 5-Jul-2012

... by: samuel

6 2 5 1 7 8 9 4 3
9 4 8 3 2 6 1 5 7
3 7 1 9 4 5 8 6 2
2 5 7 6 1 9 3 8 4
4 6 3 5 8 7 2 9 1
1 8 9 4 3 2 5 7 6
7 9 2 8 6 3 4 1 5
5 1 6 2 9 4 7 3 8
8 3 4 7 5 1 6 2 9
is that right?

Sunday 13-Nov-2011

... by: Strmckr

Jean-Claude Casari: answered via email.

a question for andrew if he reads this:

how come your solver never upgraded to include the
als-xy rule:
instead you are using mike barkers
Deathblosom which is also an als-xy rule but limited in its effectiveness through restrictions in its initial design.

Saturday 12-Nov-2011

... by: Jean-Claude

Very nice picture, strmckr, I have to buy colour pens to get there !

In order to let better understand your method, could you draw the equivalent picture for unsolvable # 27.

Many thanks,

Jean-Claude Casari

Thursday 10-Nov-2011

... by: strmckr

ronk: posted a great pic of the logic set.

after the BI BI pattern it solve using singles, 3 locked pairs 3 locked candidates and 1 skyscraper

I'm thinking the remote pairs is a bit excessive :P

Wednesday 9-Nov-2011

... by: JC Van Hay

Typo in previous post (C1 -> C3). Thus :

2 very simple steps to solve the puzzle :

#1. Exocet pattern : see ttt's post in
#2. Remote pairs : RP(35)C3B5 => +7r1c5; stte.

Wednesday 9-Nov-2011

... by: JC Van Hay

2 very simple steps to solve the puzzle :

#1. Exocet pattern : see ttt's post in
#2. Remote pairs : RP(35)C1B5 => +7r1c5; stte.

Wednesday 9-Nov-2011

... by: Jean-Claude

I have no logical solution: there no bi-value cell.

Help !

Sunday 6-Nov-2011

... by: Nick the Geek

Wow! Immediate "Rooks!" (Run Out Of Known Strategies)! I'll give it a go today.

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.
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