iSGTW - International Science Grid This Week
iSGTW - International Science Grid This Week

Home > iSGTW 12 March 2008 > iSGTW Link of the week - How low can a Sudoku go?

Link of the week - How low can a Sudoku go?

What is the minimum number of clues required to solve a Sudoku? The BOINC-powered Sudoku project is keen to find out.
Image courtesy of the Sudoku project

There are two ways to solve a Sudoku: by hand, or by writing a computer program to do it for you.

For “ordinary” Sudoku—where you begin with 25 to 30 “clue” numbers—this is a relatively simple proposition. But what happens when you start with half as many clues?

Can you still solve a Sudoku which begins with only ten clues? What about five clues? How low can a Sudoku go while still ensuring it has only one unique solution?

Running the numbers

So far, all known minimal Sudokus with a unique solution begin with 17 “clue” numbers. Further, any puzzles with fewer than eight clues have resulted in at least two different solutions. Thus, minimal Sudokus are thought to require 8-17 numbers.

A new BOINC-powered distributed computing project—Sudoku—is determined to close this gap, aiming to discover the smallest possible start configuration required to solve a Sudoku that has only one, unique solution.

Those involved in the project say initial evaluations have reduced the range to 11-17 initial clues; the next step is to use volunteer computing to increase this lower number, until one user either finds a new minimal example, or it can be shown that no such examples exist for up to 16 givens.

You can participate by downloading and running the BOINC program on your computer.



 iSGTW 22 December 2010

Feature – Army of Women allies with CaBIG for online longitudinal studies

Special Announcement - iSGTW on Holiday

Video of the Week - Learn about LiDAR


NeHC launches social media

PRACE announces third Tier-0 machine

iRODS 2011 User Group Meeting

Jobs in distributed computing


Enter your email address to subscribe to iSGTW.


 iSGTW Blog Watch

Keep up with the grid’s blogosphere

 Mark your calendar

December 2010

13-18, AGU Fall Meeting

14-16, UCC 2010

17, ICETI 2011 and ICSIT 2011

24, Abstract Submission deadline, EGI User Forum


January 2011

11, HPCS 2011 Submission Deadline

11, SPCloud 2011

22, ALENEX11

30 Jan – 3 Feb, ESCC/Internet2


February 2011

1 - 4, GlobusWorld '11

2, Lift 11

15 - 16, Cloudscape III

More calendar items . . .


FooterINFSOMEuropean CommissionDepartment of EnergyNational¬†Science¬†Foundation RSSHeadlines | Site Map