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Comments and Results for 'Sudoku XV 385'

StateTypeTitleSizePlayedAvg timeRating (#users)YoursYour bestPublishedExpires
UnplayedSudoku XVSudoku XV 3859x992615:44Mild (252)Was free until 5th Aug 201822nd JulExpired
Show full chart rankings for Sudoku XV 385
Your puzzle statistics First solution time distribution Overall puzzle statistics
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Slowest 10% not shown
0:00
28:04

Solution time without 'show wrong'
Slowest 10% not shown
0:00
28:04

Unaided first solution time
Slowest 10% not shown
0:00
21:00
Completed by328 users
Best time without any aid4:21 by zorko
Best time with major aid3:43 by ericjohnson327
Best time with show wrong
or multiple sessions
1:59 by ACW1
Average solve time with no or minor aid13:54
Average solve time with no aid14:03
Average difficulty rating - all players1.9/10.0
Average difficulty rating - no aid1.4/10.0
Average difficulty rating - minor aid3.3/10.0
Average difficulty rating - major aid1.1/10.0
Average difficulty rating - show wrong or
multiple sessions
2.4/10.0
8 comments (Add new comment)
Posted 23rd Jul 2018 at 10:38
Grizzlybare Rated puzzle: Easy Completion time: 32:12 Used 'valid marks'
always interesting puzzles
Posted 24th Jul 2018 at 08:09
SlowBurn Best completion time: 13:04 Time on first attempt: 14:10 Used 'check puzzle' when incorrect
I might be missing something here. Can someone help?
Take bottom left conner as the origin (0,0) of a normal coordinate system, then position (4,1), (4,3), (7,1) and (7,3) can have interchangeable values of "1" or "9". Is that nor true?
Posted 24th Jul 2018 at 09:53
Last edited by Elisabeth 24th Jul 2018 at 09:54
Elisabeth Daily subscriber Completion time: 28:55 Used 'show wrong moves' Used 'check puzzle' when incorrect
SlowBurn, using your coordinates, (6, 3) is a 4 and so the 1 cannot be alongside it, as 4+1 = 5 and no v so must be the 9 which fixes the others. Easy to miss!
Posted 24th Jul 2018 at 09:54
bergensbest Daily subscriber Rated puzzle: Easy Completion time: 16:45 Used 'remove' Used 'show wrong moves'
SlowBurn, if you interchange the 9s and 1s as you say then a 1 appears in the position (7,3) which is next to the 4 in position (6,3)
Posted 25th Jul 2018 at 07:13
Last edited by SlowBurn 25th Jul 2018 at 07:26
SlowBurn Best completion time: 13:04 Time on first attempt: 14:10 Used 'check puzzle' when incorrect
Thanks Elisabeth & bergensbest. Indeed I was just being blind.
It seems logical that the fewer clues a puzzle contains the more challenging it will be (desirable). However, if we keep reducing the number of clues there will come a point when the solution is no longer unique (undesirable). Can someone point me to some references about this interesting subject for a casual learner please?
Posted 25th Jul 2018 at 20:49
Last edited by awesomeusername 25th Jul 2018 at 20:50
awesomeusername Rated puzzle: Easy Completion time: 13:02
Here's an article I found. Turns out the fewest number of clues you can have is 17, at least for a standard 9x9 grid.

https://www.technologyreview.com/s/426554/mathematicians-solve-minimum-sudoku-problem/

EDIT: An even better resource: https://en.wikipedia.org/wiki/Mathematics_of_Sudoku

Posted 26th Jul 2018 at 07:41
SlowBurn Best completion time: 13:04 Time on first attempt: 14:10 Used 'check puzzle' when incorrect
Thanks awesomeusername! Wiki page, who would have thought?! Now I am blind and incompetent :).
Posted 30th Jul 2018 at 18:05
Nami Rated puzzle: Easy Best completion time: 11:31 Time on first attempt: 14:39
Very interesting puzzle. ☺
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Key

  • A yellow/light blue highlight in the time distribution charts highlights your time, where relevant.
  • Rating scores out of 10.0 show the average difficulty rating chosen by users, where 1.0 is "Easy" and 10.0 is "Hard".
  • If a puzzle is opened more than once, including by loading from a saved position, then this is potentially a significant aid so it is listed as being completed with 'multiple sessions' for the purpose of the best time/average rating displays above.
  • Minor aid is defined as no more than one use of 'Check solution' when incomplete and/or no more than one use of 'Check solution' when wrong; and/or using highlighting aids (show repeated digits, show broken inequalities and show valid/invalid placements [slitherlink] only). Major aid is any and all other use of the solving aids except for 'show wrong'.

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