... 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!!

... by: zvprzp

Qds6Dz mkkbjqpasgoy

... by: Enes

Pretty nice post. I just stumbled upon your blog and wtenad to say that I've truly enjoyed browsing your blog posts. In any case I'll besubscribing to your rss feed and I hope you write again soon!

... 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).

-marcel

... 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?

... 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.

... 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
casarijc@hotmail.fr

... by: strmckr

ronk: posted a great pic of the logic set.

http://i41.tinypic.com/16kqmvd.jpg

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

... 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 http://www.sudoku.org.uk/SudokuThread.asp?fid=4&sid=11320&p1=1&p2=17.
#2. Remote pairs : RP(35)C3B5 => +7r1c5; stte.

... by: JC Van Hay

2 very simple steps to solve the puzzle :

#1. Exocet pattern : see ttt's post in http://www.sudoku.org.uk/SudokuThread.asp?fid=4&sid=11320&p1=1&p2=17.
#2. Remote pairs : RP(35)C1B5 => +7r1c5; stte.

... by: Jean-Claude

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

Help !

... by: Nick the Geek

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