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Prime Exotica - LMI Jan 2011 Sudoku Test108 posts • Page 5 of 5 • 1 2 3 4 5
@ 2011-01-27 7:09 PM (#3325 - in reply to #3146) (#3325) Top

lucarabino



Posts: 1

Country : ITALY

lucarabino posted @ 2011-01-27 7:09 PM

Hi. I found that ROSSINI and TENNISDOKU were not able to be solved, because in ROSSINI double arrows were not visible and in TENNISDOKU only few scores were visible (in application and in the pdf). Why??? How could be solved by the winners?
@ 2011-01-27 7:26 PM (#3326 - in reply to #3325) (#3326) Top

Ours brun




Posts: 148
1002020
Country : France

Ours brun posted @ 2011-01-27 7:26 PM

Hi,

In both cases you need to be very careful about the sentence beginning like this : "If there is no..."

To be clear : on rossini sudoku, there are no arrows because, on this particular puzzle, digits are never in strictly ascending or descending order. This is a very useful information.
On tennisdoku, where there isn't a tennis ball the score can't be one of a tennis match. For example, if there is no ball touching a "4", there can't be a "6" in the adjacent cells.

Does it help you ?
@ 2011-01-27 7:39 PM (#3327 - in reply to #3146) (#3327) Top

Ours brun




Posts: 148
1002020
Country : France

Ours brun posted @ 2011-01-27 7:39 PM

A few more help, if needed :

! SPOILER !


Let's have a look at Rossini sudoku :

Spoiler: show

There is no arrow at the right of 5th row. This means that the 3 corresponding digits cannot be in either ascending or descending order. We already have 5>1 so the cell located between those two must contain a digit which is either smaller than 1 (impossible) or bigger than 5. This digit has to be 8...


Now look at Tennisdoku :

Spoiler: show

The 5th row is again particularly useful. 2, 6, 8 and 9 remain to be placed. There is a ball touching the 3; the only possible score with a 3 is 6-3, so let's put a 6 in R5C2.
Then : on the left edge of this cell, there is no ball. So, R5C1 and R5C2 (6) cannot form a valid score. 2, 8 and 9 remain to be placed. 2-6 would be a valid score, as well as 8-6. So, there must be a 9 in R5C1...

@ 2011-01-27 8:49 PM (#3329 - in reply to #3325) (#3329) Top

rakesh_rai




Posts: 774
500100100202020
Country : India

rakesh_rai posted @ 2011-01-27 8:49 PM

lucarabino - 2011-01-27 7:09 PM

...in TENNISDOKU only few scores were visible (in application and in the pdf)...
Thanks Ours brun.

lucarabino: Yes. In Tennisdoku (as also in Kid sudoku), all scores were not given as clues, as then it would have become too easy. But the grid was solvable with the given clues as the tennis balls provided enough hints. And 59 solvers did solve it.

@ 2011-01-27 8:51 PM (#3330 - in reply to #3146) (#3330) Top

Administrator



2000100050020
Country : India

Administrator posted @ 2011-01-27 8:51 PM

Solution Booklet here
@ 2011-01-27 8:56 PM (#3331 - in reply to #3146) (#3331) Top

Ours brun




Posts: 148
1002020
Country : France

Ours brun posted @ 2011-01-27 8:56 PM

Thanks for having modified my post, I didn't know that there was a "spoiler tag".
Prime Exotica - LMI Jan 2011 Sudoku Test108 posts • Page 5 of 5 • 1 2 3 4 5
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