Hi, last puzzle is only a classic sudoku? Why a diagonal is marked?

The grey cells will contain the digit X from the puzzle 1-9. Row 1 contains the digit encoded by X in puzzle 1. Row 2 will contain the digit encoded by X in puzzle 2. Same goes with Rows 3-9 and Puzzles 3-9. So it's not a "marked" diagonal.
All digits X from the top puzzles go in the top Sudoku. All digits X from the bottom puzzles, go in the bottom Sudoku.
It's all explained in the instruction booklet.

One question:
Does each puzzle solve independently or is the X-clue influenced by digits it can't be because of the last Sudoku?

You can try to use the possibilities for Xs from Sudoku, but it's not mandatory as all the puzzles 1-9 are solvable independently.

Edited by forsmarts 2012-11-24 3:46 AM

I'll have to be extra careful in this one with the 3 separate answer keys. I think if rows/columns are rightly placed one can safely assume that the decryption has been done correctly, especially since the solver knows that part may be required later.

Prasanna,
"Cryptic sequence" is rarely more than 5 digits long, so you can treat it as the "feature" of this test, not taking much time and attention. But the rows/columns will surely need all your attention, I really don't want to take away any points in case of mistypes, but I'll have to. Also I'd like to remind everyone to pay double attention to which row/column you're describing, last year there were surprisingly lot of entrances of the wrong rows/columns.

Edited by forsmarts 2012-11-25 10:57 PM

Sorry, just to confirm again. I think its a wrong way to interpret this if I feel you'll be lenient on the Cryptic Sequence aspect of the key, as long as the rows/columns part is correct?

I expect all the keys to be correct in order to get the points, as always. Whether I decide to satisfy the "claim points" appeal when the "cryptic sequence" is wrong - depends on each individual case, but I wouldn't count on it :)

Is it a rule that the cryptic has to be numbers from 1-N?
Like All-Seeing Snake, number set is not consecutive.
But in Minesweepers, number set is consecutive from 1-N.

Also, can the cryptic be one of the givens?
In Thermometers, 1 is given and is not in the cryptic.
In Four Winds, 2 is given and is not in the cryptic.
Is this a coincidence or a rule?

Hidden numbers can be from a range 0-N, not necessary consecutive as can be seen from All-seeing Snake example.



It is a coincidence, don't drop any possibilities based on the givens.

A question about number 0.
In some puzzles (sudoku difference, futoshiki, all-seeing snake, abc-box, classic sudoku) it' obvious that a 0 cannot appear.
In other puzzles (slither link, minesweeper) it's possible and very probably it will be.
But in first seen coral, thermometers and four winds? Usually, it doesn't, but can you confirm all my interpretations?

Thanks

Alberto

I agree with your observations. In common: where it's natural for zero to appear among the givens - you should take this option into account.

I think this set will be as difficult as till last year...
BTW, in the example answer of Sudoku Difference, R3C2(5) is wrong. it must be 4.

It won't be easy, you're right :) But I've tried to make it easier than last year.

Sorry for that mistype.

Is this competition available in online mode ???

There will be no online solving for this test.

In the thermometers example puzzle, a 1 is given as an outside clue. Is it just coincidence that none of the letters stands for a 1?

Just a coincidence, as mentioned above in this thread.

So... I had a lot of trouble finding a logical approach to many of the puzzles on this test, and am a little unsure whether I just failed there, or whether trial and error is how you're meant to go. Particularly since some puzzles (the Futoshiki and ABC-Box puzzles, say) had a nice solution path.

Thanks for making the test regardless.

Out of curiosity, what changed in the puzzle booklet? It looks like a new one was uploaded while I was working on the puzzles. (Did better than I expected; from the IB, this was pretty intimidating, and most of the puzzles were just as confounding as I expected.)

Slitherlink top had multiple solutions (because of which Classic Sudoku top also had multiple solutions). This was fixed in the puzzle booklet.
Players who had started before the fixed booklet uploaded will get points for submitting any of the correct solutions.

(I thought I posted this in forum, but it looks like I just typed it, and may be closed my browser.)

Hah. Maybe that explains why it seemed unusually easy for me. :)

can the letters be 0?

Depends upon the puzzle. They can represent 0 in puzzle like Slitherlink.
They cannot be 0 in puzzle like all-seeing snake.

Please check this post and Vladimir's reply too.

Happy jubilee, Vladimir!

Very nice puzzles! I had a bad start and with one mistake I could not finish the first sudoku. It took me another 50 minutes to complete the test.

Nikola

So it's a hard test for me. First submission in 50 minutes or something, that's after a first go looking at all and failed to find the solution. I started to go trial and error (or look ahead?) and it worked pretty nicely for 8 puzzles (the rest I didn't have time :P ).

Nice test though. If Fillomino Cipher had appeared, I would probably solve those right away, but it seems like people are sick of Fillomino after FF2 :P

How balanced do you think the puzzle types of this test were?	Fairly balanced
What was your opinion of the distribution of easy/hard puzzles?	A bit hard
What did you think about the puzzle quality of the test?	Very nice
What was your opinion about the answer key extraction?	Perfect answer keys
How did you feel about the length / time limit for this test?	Just right
What was your opinion of the booklet formatting and printing?	Just right

How balanced do you think the puzzle types of this test were?	Perfectly balanced
What was your opinion of the distribution of easy/hard puzzles?	Just right
What did you think about the puzzle quality of the test?	Very nice
What was your opinion about the answer key extraction?	Mostly perfect answer keys
How did you feel about the length / time limit for this test?	A bit too many puzzles
What was your opinion of the booklet formatting and printing?	Too few pages / too small grids

How balanced do you think the puzzle types of this test were?	Perfectly balanced
What was your opinion of the distribution of easy/hard puzzles?	A bit hard
What did you think about the puzzle quality of the test?	Average
What was your opinion about the answer key extraction?	Perfect answer keys
How did you feel about the length / time limit for this test?	Way too many puzzles (too little time)
How fair do you think the rankings were?	All players got the score they deserved
What was your opinion of the booklet formatting and printing?	Just right

How balanced do you think the puzzle types of this test were?	A bit skewed
What was your opinion of the distribution of easy/hard puzzles?	A bit hard
What did you think about the puzzle quality of the test?	Fairly Nice
What was your opinion about the answer key extraction?	Mostly perfect answer keys
How did you feel about the length / time limit for this test?	A bit too many puzzles
How fair do you think the rankings were?	Most players got the score they deserved
What was your opinion of the booklet formatting and printing?	Just right

How balanced do you think the puzzle types of this test were?	Perfectly balanced
What was your opinion of the distribution of easy/hard puzzles?	A bit hard
What did you think about the puzzle quality of the test?	Fairly Nice
What was your opinion about the answer key extraction?	Mostly perfect answer keys
How did you feel about the length / time limit for this test?	A bit too many puzzles
How fair do you think the rankings were?	Most players got the score they deserved
What was your opinion of the booklet formatting and printing?	Just right

How balanced do you think the puzzle types of this test were?	Fairly balanced
What was your opinion of the distribution of easy/hard puzzles?	Too many hard puzzles
What did you think about the puzzle quality of the test?	Average
How did you feel about the length / time limit for this test?	Way too many puzzles (too little time)
What was your opinion of the booklet formatting and printing?	Just right

Solution booklet

The test is over. Thanks to all the puzzlers for participation! Special thanks to Nikola for the congratulations :)

TOP 3:
1. Kota Morinishi (JAP)
2. Hideaki Jo (JAP)
3. Palmer Mebane (USA)

It was a very impressive performance from Kota, with just the bottom All-seeing snake unsolved. Congratulations!

Some statistics:

- The puzzle solved by least competitors (aside from Classic Sudokus) was the same bottom All-seeing snake. It was solved by 12 competitors.
- The puzzle solved by most competitors was top Four winds. It was solved by 89 competitors.
- The puzzle with the highest rating was bottom Futoshiki (8.83) and the puzzle with the lowest rating (again aside from Classic Sudokus) was top Sudoku difference (6.62), which is pity as it was the first puzzle I've created for this set and it led to the whole thing :)
- The puzzles submitted with the highest/lowest accuracy were the Classic Sudokus - top (100%, 3 out of 3) and bottom (40%, 4 out of 10)

I'm sorry for the fact that broken Slitherlink puzzles appeared in the original booklet (had multiple solutions, all the solutions aside from the intended ones were accepted) and we had to upload the new booklet during the contest. I believe it had no significant impact on the table of results.

See you next year or even earlier :)

All the best,
Vladimir

Congratulations Kota for the very impressive win. That makes it 2 in 2 months.