I really enjoyed the puzzles, thanks to all the authors for the fun! Given the differences in difficulties, I also think it would make sense to normalise the puzzles based on observed performance.

Also congrats Macher, I also used mspaint for everything and it can be annoying at times. I am now trying Paint.NET which is similar but has layers and unlimited undos - useful for when you want to *cheat*!

Good to know there are other people who have to struggle with paint during these tests too

Score page is under maintenance, and will be back online soon.

Submission is now disabled for Puzzle Marathon.

Puzzle Marathon is now over. Congratulations to motris, MellowMelon and Kota for winning.

Individual puzzle wise, there were 6 winners. Volxa (Kakuro), motris (Loop The Loops, Samurai Sudoku, Braille Word Search, Pentomino Areas), xevs (Graffiti Snake), Para (Black And White Loop, Small Regions), ACM (Tapa)

In a turn of events, I have many individuals to thank to for this event.
Thanks to Rohan, Serkan and Zoltan to first listening to the idea and believing in it, and then adding all the required inputs. The scoring system, the puzzles types could have been very different without their suggestions.
Thanks to all puzzle authors : Tom (Kakuro), Prasanna (Loop The Loops), Serkan (Graffiti Snake), David Millar (Braille Word Search and for the logo), Zoltan (Black And White Loop, Small Regions), Vladimir (Pentomino Areas and Tapa). I wrote Different Neighbours and Samurai Sudoku, and unfortunately the difficulty of Samurai was not appropriate.

I hope everyone enjoyed the test.

Link to score page : http://logicmastersindia.com/M201201P/score.asp
If your name is missing in the score page, it is intentional. Please PM me for clarification.

Thanks for some great puzzles. Regarding Samurai: I had figured the IB version was just going to be much harder than the actual one. If it had been mentioned that the two would be similarly hard, I could have pointed out there would be a problem. I'm sure many others could have too.

I find it funny how my individual puzzle rankings resemble my WPC playoff ones. Here I didn't win any of the puzzles but my time was in the top 5 for all of the types I care about (sudoku and word searches are bleh). Similarly in the WPC playoff: on every puzzle I had the 2nd, 3rd, or 4th fastest time of the competitors that finished, but never the fastest. (which reminds me that I got sent the time breakdowns in an email with a promise that it would be posted publically soon after, but I guess that slipped someone's mind)
Apparently I'm better at being consistent than having incredible times on individual puzzles.

One thing I would like to discuss that wasn't in the feedback is answer extraction. Obviously some of these methods are tried and true (Sudoku, Star Battle), and I continue to find the "longest group" method very nice as well (Tapa, Snake, Loops) especially given its advantages in an instant grading system.

I haven't seen the Kakuro and Different Neighbors style before, but that might be one of the cleanest of any mechanisms I've seen. Finding marked squares is often a pain, and in November's test it was even common to miss some I's/J's. This one-per-column system with all of those columns marked solves that issue in an extremely nice way. I hope this one is adopted by all future tests where appropriate.

The Word Search and Pentomino Areas extractions were fine - not amazing but not at all bad. Black and White Loop was the only mechanism that really bothered me. It's a good method for smaller grids, but keeping track of things on the large grid was tricky. I was half expecting to get the red X on my first submission for that one (the time penalty wasn't enough to justify further checking).

Thanks for the test. Awesome, as always.

Funny story: Even though Graffiti Snake was one of my best puzzles, relatively speaking, one piece of logic I'd been using was completely bogus: Since the head and tail were in opposite corners, the snake has to cross each line an odd number of times. So, for example, if there are an odd number of clues in a column, exactly one of the black bars has to touch the edge of the grid, so that there aren't an even number of gates. However! Since a snake could enter the gate and leave on the same side it entered, that wouldn't count as a crossing. Therefore, bogus logic. (An example of a column that fails my test would be the one with 5-3-3.)

I hope I explained that well enough. It just means that I got really lucky.

Edited by figonometry 2012-01-30 8:31 AM

Reg answer key mechanisms :

Kakuro and Different Neighbours - During my solve, I couldn't find any row / column / contiguous cells to be marked as answer key. (Kakuro for being so scattered solve and DN for being DN). When I shared the circled cells with one circle per column idea to Tom, he instantly agreed that this will be a cleaner approach. I just adopted the same for DN.

Zoltan was never a big fan of marking letters inside the grid for B&W Loop. I was not keen on marking "rows with longest length". I have been seeing how players are making mistakes in the longest length mechanism for a while now. It was my decision to mark letters inside the grid, rather than arrows outside the grid - based on this poll results - http://logicmastersindia.com/forum/forums/thread-view.asp?tid=358
Yes, for a big grid, it is not an easy key, but the other way I looked at it, when you are trying to find the answer key, and you don't visit some letters, that means you definitely have a mistake in the solve.

We discussed about some potential scoring systems. I'm attaching the individual solving times (in excel form) so that it will be easier to do any kind of simulations.
For example : bonus should be given only to players with solving time < 30 minutes + best time is captured in the excel.

Link : http://logicmastersindia.com/M201201P/MarathonSolvingTimes.xlsx

Edited by debmohanty 2012-01-30 10:50 AM

For Snake, it was a problem. I found many players submitting "longest black cells", not "longest snake part".
I decided not to penalize players for making this answer key misunderstanding, but their bonus was not adjusted.

That reminds me to add a note that, during Decathlon we put lot of effort to make sure that all possible answer keys are captured in the system (e.g. row / column swaps). I didn't have to do similar effort in this case because of "single puzzle" submission mechanism.

All puzzles are pinned and uploaded as a single pdf without password here

Thanks to all who participated, and to Deb for allowing me to contribute a puzzle and design the logo for this test.

If you have an account on my blog, The Griddle, and solved my braille word search in this test, enter the two missing words in your code entry page to unlock the new "Run For Your Life!" badge: http://thegriddle.net/home/badges/18

I noticed that some of the authors have participated as players too. They have been awarded an arbitrary 100 points for the puzzle they provided. I believe this is penalizing. In a competition in which the difference between players is given by the bonuses (which is good, and is the strongest point of this beautiful competition), it is equivalent to deny them the opportunity to earn a bonus in the puzzle they provided (for which they are supposed to be strong solvers too...). In my opinion it could be fair to award the author of a puzzle a bonus score equivalent to the average of their bonus scores obtained in the remaining puzzles solved (including zeroes, if any).

I agree that 100 points is not fair to all authors (it was not arbitrary though, 100 was assigned based on the assumption that an author should be able to solve his puzzles, and we just took the worst case scenario where there is no bonus). So, yeah, it is bit harsh.

In fact we started "best 9 of 10" to handle authors' cases. But later, 9 of 10 turned out to be very essential for this kind of contest even otherwise. So, we can give some bonus points based on forcolin's formula above. Or, we can say for authors, it should be best 8 of 9, and then multiply the score by 9/8.

Is it a good idea to have an option where a player can choose if he/she needs a hint to solve a puzzle at the cost of some X points depending on the time lapsed from the start of puzzle along with reduced bonus system (if applicable) ?
This might help few solvers to have the satisfaction of solving all the puzzles and create more interest in puzzles.

Regards,
Ravi

Can we make mine best 4 of 9 for this one and then multiply?

Anyway, on a serious note, I personally was fine with this format because I considered it a bonus in itself to co-author and participate in the same test. However, if everyone feels that what Stefano or Deb have suggested is fine to implement next time, then all the better!

I was surprised to be fastest on 2 puzzles. I don't generally top lists. As Palmer said he didn't finish any puzzle fastest in the playoffs, I didn't score any top 3 spots in any round, but still finished 5th overall after 2 days on the WPC before the playoffs.
I'm also surprised a bit to be in the top 5 as I've never considered myself good at solving big puzzles on speed. I usually make too many mistakes. It was fun, but I think I would have done better on the Samurai and Graffiti Snake if I had solved them in a row with the other 8 puzzles. I hasn't realised when I started all 10 puzzle types weren't listed to be honest. Will remember that for next time.

I think the scoring probably works better with a distance from the top time system. It seems a bit weird to be the fastest solver in a type and have to drop that puzzle.

Now that the full puzzle booklet is available, I am finding that it crashes my Adobe within a few seconds of opening it. Can we get individual puzzle versions?

Cyclone

Individual puzzle booklets without password uploaded at http://logicmastersindia.com/M201201P/

It doesn't make sense to me. It also is very impractical.

macherlakumar: I see some use in having easier puzzles available for people to try and to get started with, but to implement them in a test here is impractical, and this really doesn't seem the place for it. If there are any types that anyone wants to start on but where some simpler puzzles are needed, I strongly suggest contacting some puzzle authors in the community and requesting them. Speaking for myself, I'm happy to take requests, and many others in the community probably would be at least somewhat accommodating too.

Yes you are right I did not think through this thoroughly.

Regards,
Ravi

Time for some statistics -

Number of Puzzles Vs Starts / Finishes / Bonus

It is extremely pleasing to see that 124 players finished all 10 puzzles.
Also, on an average (of 259 players who submitted at least 1 puzzle), a player finished 7.4 puzzles.


And because of the interesting bonus system, here is how the 20th / 50th score compared against the top score.

From the feedback page :



There is a bit of story behind Graffiti Snake. The first version of IB had "Paint By Number". We wanted to include PNB because, as per Rohan's word, PNB is king of big puzzles. But before I asked Serkan to make PNB, I suggested that he should make a Graffiti Snake instead. (I get 1% credit for selecting the type, and Serkan gets 99% credit for making a beautiful puzzle)




Next 3 sets of graphs pretty much suggest that the corresponding aspects of the test were close to perfect.












Many players voted that they would use Online solving if provided. We will try to provide that next time, but no promises. We face enough issues while supporting both online and paper for Sudoku tests.




Of 149 players, 144 players voted that they would participate in future marathons, either as player or as player + author.

I found a technical issue at the result page(score.asp)
... columns of each puzzle are sorted improperly when they are displayed in 'Points'(not 'Submission Time').

They are to be sorted in numerical order(like 'Points' and 'Bonus' columns),
but they are sorted in character-based(ASCII) order ...

# I remember that some of them were correctly sorted a few days ago.