@ 2011-01-27 6:34 PM (#3324 - in reply to #3309) (#3324) TopPosts: 148
Country : France
Ours brun posted @ 2011-01-27 6:34 PM
rakesh_rai
However, in my opinion, there were no such puzzles which required extra/outside knowhow. All knowledge needed was in the instructions. Some basic rules for prime numbers, multiplication, addition was all that was needed.
motris
I personally disliked most of the puzzles that seemed to require extra/outside knowledge.
I personally disliked most of the puzzles that seemed to require extra/outside knowledge.
However, in my opinion, there were no such puzzles which required extra/outside knowhow. All knowledge needed was in the instructions. Some basic rules for prime numbers, multiplication, addition was all that was needed.
I agree with motris; as Rakesh said, in the current case all puzzles were solvable without outside help. However, in some cases, "cheat sheets" could certainly allow to save a non-negligeable amount of time ; this, I dislike. But it is not really a specificity of this particular test ; when solving killer sudoku, using a sheet with all the possible combinations of digits can also prove useful - and lots of people use such a sheet every time they solve a killer sudoku. The important point for me is to clearly mention what is allowed, and what isn't (the ideal being for me : "no exterior help, of any kind, is allowed").
rakesh_rai
The puzzle was not much dependent on a list - It was easily solvable without needing that list, and probably faster too.
motris
...And the prime list link in the forum wasn't removed or turned away so as to say "do not bring such a thing into a test".
...And the prime list link in the forum wasn't removed or turned away so as to say "do not bring such a thing into a test".
The puzzle was not much dependent on a list - It was easily solvable without needing that list, and probably faster too.
Which is why I liked the puzzle, despite being primarily reticent to the idea. No need to know - or search for - big primes to solve it. By the way, nice job on this particular puzzle.
rakesh_rai (concerning multitab sudoku)
Here's the approach which I had intended. Of course, there could be better and quicker approaches. But this is what I had thought of.
Here's the approach which I had intended. Of course, there could be better and quicker approaches. But this is what I had thought of.
I solved this puzzle once the competition was over, and did nearly exactly the way you did.
@ 2011-01-27 7:09 PM (#3325 - in reply to #3146) (#3325) TopPosts: 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) TopPosts: 148
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 ?
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) TopPosts: 148
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 :
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 :
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...
! 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) TopPosts: 774
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....in TENNISDOKU only few scores were visible (in application and in the pdf)...
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
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) TopPosts: 148
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".