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Classic Tapa Contest — 2nd January - 20th February 2016
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@ 2016-02-15 12:04 AM (#20998 - in reply to #20393) (#20998)Quote Reply Top

CTC Comments



CTC Comments posted @ 2016-02-15 12:04 AM

Comments on 2016-02-12's Tapa
prasanna16391 commented at 2016-02-12 00:15:53
Made a false assumption on the 1-1-1-1 near the bottom right, which took a while to fix, but went nicely otherwise.
swaroop2011 commented at 2016-02-12 00:20:03
This one no assumption. Went nicely entire time with little stopping for solving the right half. A nice puzzle again.
MrLiang commented at 2016-02-12 09:33:12
my brain blocked by two 2-4 clue. :(
rajeshk commented at 2016-02-12 18:35:56
Nice one. Did without any guess work.
@ 2016-02-15 2:46 AM (#21000 - in reply to #20947) (#21000)Quote Reply Top

yureklis



Posts: 183
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yureklis posted @ 2016-02-15 2:46 AM

brecher92 - 2016-02-09 3:02 AM

I hope Serkan's hand is better!


Recently I had an operation, in these days the time is not by my side, it flows very slowly, and I'm perceiving so much pain than I'd already have, I'm living a delusion :). Also I've figured how hard to able to write :). I have so much pain, but I hope that in next 10 days it will be better for me.

Thanks for asking
@ 2016-02-15 10:10 AM (#21001 - in reply to #20393) (#21001)Quote Reply Top

Administrator



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Country : India

Administrator posted @ 2016-02-15 10:10 AM

Tapa Grid Sizes for Week 7 (last week)

Here are the grid sizes for the last week.

16th Feb : 17x17
17th Feb : 18x18
18th Feb : 18x18
19th Feb : 8x8
20th Feb : 9x9
21st Feb : 10x10
22nd Feb : 19x19
23rd Feb : 13x13


@ 2016-02-16 12:05 AM (#21004 - in reply to #20393) (#21004)Quote Reply Top

CTC Comments



CTC Comments posted @ 2016-02-16 12:05 AM

Comments on 2016-02-13's Tapa
prasanna16391 commented at 2016-02-13 00:06:45
Made a faulty assumption, had to restart, but really nice break-in with the 1111 forcing behaviour of the 112.
swaroop2011 commented at 2016-02-13 00:09:20
aah got stuck on this one. I think i am missing some start here. will have to try again.
prasanna16391 commented at 2016-02-13 00:21:05
The start - the 1-1-1-1 in R7C4 forces the 1-1-2 below it to have its '2' around the 1-1-1-1-1 and so the 3-3 below the 1-1-2 can only have one of its '1's. This means R10R11C3 are shaded and their counterparts for the 3-3 clue, and I think it flows well from here.
rob commented at 2016-02-13 00:32:29
Hah, damn, I made that deduction with that other 1111 next to the 12, but failed to see it near the 33. Weird.
rajeshk commented at 2016-02-13 11:54:40
Thanks Prasanna for giving the logical break. I guessed to solve this one. However after reading your comment, I could solve it fully logically :)
masonjason commented at 2016-02-13 19:13:57
I thought the interaction of the left-hand pair of (1, 1, 1, 1)s via the (2, 3) was beautiful
john_reid commented at 2016-02-14 01:49:32
Well I was able to solve this with no guessing but unfortunately someone stopped by when I was in the middle of it and I ended up chatting for 45 minutes with them before I got back to the puzzle! It was a great puzzle though and I'm proud that I was able to work out that 1-1-1-1 and 1-1-2 interaction that Prasanna described and didn't have to resort to any guessing. Very satisfying!
@ 2016-02-17 12:06 AM (#21018 - in reply to #20393) (#21018)Quote Reply Top

CTC Comments



CTC Comments posted @ 2016-02-17 12:06 AM

Comments on 2016-02-14's Tapa
swaroop2011 commented at 2016-02-14 02:29:18
Damn. Did one mistake, but luckily found it before submitting. Costed lot of time. Nice use of 1's and connectivity.
rob commented at 2016-02-14 19:47:53
Fun! I like the lack of a heart theme.
john_reid commented at 2016-02-15 23:11:07
Another great one!
@ 2016-02-17 12:19 AM (#21019 - in reply to #20393) (#21019)Quote Reply Top

Nilz



Posts: 29
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Country : United Kingdom

Nilz posted @ 2016-02-17 12:19 AM

Is there an error in today's solution? I'm fairly sure I've solved it, but it's not letting me submit. Of course, it's possible I'm being an idiot, but I've triple-checked!
@ 2016-02-17 12:21 AM (#21020 - in reply to #20393) (#21020)Quote Reply Top

Nilz



Posts: 29
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Country : United Kingdom

Nilz posted @ 2016-02-17 12:21 AM

Hmm, it just let me submit 7 minutes later and I'm certain I didn't change anything- could you check my solve please and fix my time if you can see that I had the correct solution earlier (if this is possible)? Thanks.
@ 2016-02-17 12:23 AM (#21021 - in reply to #21019) (#21021)Quote Reply Top

debmohanty




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Country : India

debmohanty posted @ 2016-02-17 12:23 AM

Nilz - 2016-02-17 12:19 AM

Is there an error in today's solution? I'm fairly sure I've solved it, but it's not letting me submit. Of course, it's possible I'm being an idiot, but I've triple-checked!


Nilz - 2016-02-17 12:21 AM

Hmm, it just let me submit 7 minutes later and I'm certain I didn't change anything- could you check my solve please and fix my time if you can see that I had the correct solution earlier (if this is possible)? Thanks.


The solution has been corrected. That is the reason your submission was accepted. I'm working on getting your (and Ivan's and some other players') timing correct.
@ 2016-02-17 12:24 AM (#21022 - in reply to #20393) (#21022)Quote Reply Top

Nilz



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Country : United Kingdom

Nilz posted @ 2016-02-17 12:24 AM

Thanks Deb!
@ 2016-02-17 5:32 PM (#21031 - in reply to #20408) (#21031)Quote Reply Top

brecher92



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Country : United States

brecher92 posted @ 2016-02-17 5:32 PM

Administrator - 2015-12-28 9:25 PM

CTC Scoring system

The scoring system and formula are exactly same as previous years.

  • Submissions within 60 minutes will be considered for scoring
  • 2 minutes penalty for each wrong submission
  • 15% time penalty for each late day (maximum 2 late days are allowed – so a puzzle can be solved upto 72 hours after it is uploaded)
  • Each puzzle has its own points, which is computed from solving times of top 10% players on that day.
  • Each player gets points for solving a puzzle based on own solving time and others’ solving times. Exponential distribution is used.
  • Total points for a player is sum of puzzle points over 7 weeks.
Details in the pdf file Download | View



Just curious -- when there are a lot of people who did not finish the puzzle (as with today's), do they get factored into the calculation for MED?
@ 2016-02-17 8:35 PM (#21033 - in reply to #21031) (#21033)Quote Reply Top

debmohanty




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Country : India

debmohanty posted @ 2016-02-17 8:35 PM

brecher92 - 2016-02-17 5:32 PM

Just curious -- when there are a lot of people who did not finish the puzzle (as with today's), do they get factored into the calculation for MED?

For scoring purpose, only players with CoTI <= 1 hour is considered. All DNFs are ignored.

For example, if you go to 14th Feb's in the score page, you should see a line at the top :

Results for 2016-02-14's puzzle / Num Players : 200 / Top 10% : 20 / Top 10% AVE : 102.1950 / PuPo : 10.1091 / MED : 275.5600
All 5 DNFs are ignored. All 3 players with CoTi > 3600 are ignored too.

@ 2016-02-18 12:07 AM (#21036 - in reply to #20393) (#21036)Quote Reply Top

CTC Comments



CTC Comments posted @ 2016-02-18 12:07 AM

Comments on 2016-02-15's Tapa
Rohan Rao commented at 2016-02-15 00:03:45
That was fun! One of the best so far.
Para commented at 2016-02-15 06:49:03
This one had a lot of similarities to January 24th.
john_reid commented at 2016-02-15 23:21:10
Excellent!
@ 2016-02-18 1:12 AM (#21038 - in reply to #21000) (#21038)Quote Reply Top

brecher92



Posts: 30
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Country : United States

brecher92 posted @ 2016-02-18 1:12 AM

yureklis - 2016-02-14 4:46 PM

brecher92 - 2016-02-09 3:02 AM

I hope Serkan's hand is better!


Recently I had an operation, in these days the time is not by my side, it flows very slowly, and I'm perceiving so much pain than I'd already have, I'm living a delusion :). Also I've figured how hard to able to write :). I have so much pain, but I hope that in next 10 days it will be better for me.

Thanks for asking


I know what you mean -- when I'm not well, it feels like the days last forever, and I just can't wait for the day I'm all better.

Hope that day is coming for you soon.


Edited by brecher92 2016-02-18 1:13 AM
@ 2016-02-18 11:25 AM (#21042 - in reply to #20393) (#21042)Quote Reply Top

debmohanty




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debmohanty posted @ 2016-02-18 11:25 AM

23rd Feb is the last day for CTC 2016


50th day of CTC will be on 23rd Feb.


@ 2016-02-19 12:39 AM (#21043 - in reply to #20393) (#21043)Quote Reply Top

CTC Comments



CTC Comments posted @ 2016-02-19 12:39 AM

Comments on 2016-02-16's Tapa
achan1058 commented at 2016-02-16 00:13:01
Yet another 2 minutes...... I am really beginning to hate this penalty thing.
@ 2016-02-19 12:46 AM (#21044 - in reply to #20393) (#21044)Quote Reply Top

cheese



Posts: 2

Country : Hungary

cheese posted @ 2016-02-19 12:46 AM

I could not submit my solution (18th Feb) when I finished solving it (about 20 minutes before deadline). I tried again then some minutes later again but could submit only after a half hour.
@ 2016-02-20 12:10 AM (#21054 - in reply to #20393) (#21054)Quote Reply Top

CTC Comments



CTC Comments posted @ 2016-02-20 12:10 AM

Comments on 2016-02-17's Tapa
debmohanty commented at 2016-02-17 00:59:13
Timing adjusted for anurag, chaotic_iak, litleboy, nilz, prasanna16391, TiiT
prasanna16391 commented at 2016-02-17 01:01:16
Not sure how to rate this one. I re-solved it later with some very narrow connectivity logic, which was excellent and a lot of fun. But I just don't think that this was something most people would be able to see with a timer running, and with the big size its more of a lottery for someone who just intuitively solves for the middle being empty. .
brecher92 commented at 2016-02-17 02:39:14
I still don't see the logic with the 1-1-3 on the left side. I'm looking at a few other people's solves and see that this was handled early on, but I don't see how.
achan1058 commented at 2016-02-17 02:52:56
I do not understand this puzzle. The amount of guesses I have made is insane.
achan1058 commented at 2016-02-17 02:57:55
By the way, how do you view other people's solve?
detuned commented at 2016-02-17 03:50:30
absolutely brutal!
brecher92 commented at 2016-02-17 03:51:37
achan, it's on the standings page -- click on "Others' solves"
Para commented at 2016-02-17 04:31:45
Well, that was awful.
swaroop2011 commented at 2016-02-17 06:49:41
very hard.
swaroop2011 commented at 2016-02-17 06:50:16
half of the puzzle i could solve it logically. But later had to guess couple of times which didn't went my way.
anderson commented at 2016-02-17 10:24:49
I guessed the 1-1-3 on the left side and got lucky because that guess propagated through the whole puzzle. Looking at it again, I'm having a lot of trouble completing it logically (i.e. not looking more than 2 steps ahead).
MrLiang commented at 2016-02-17 11:19:53
Ahh!! brain block. It's look like "Puzzle Marathon" for me. :(
tamz29 commented at 2016-02-17 15:47:36
Should've guessed earlier :/
rob commented at 2016-02-17 17:18:02
I only figured out that left area towards the end, with some not-quite-rigorous solving before (though the middle area being empty was necessary due to uniqueness at some point). But it's possible to start there. The core restriction there is that the bottom right cell of the 113 can't be isolated, else it breaks the single 4 together with the 24 and the 33 below. Then you can deduce that the top left cell of the 113 has to escape upwards past the 14, and the top left corner can be resolved.
gareth commented at 2016-02-18 00:16:34
Far too hard for a daily puzzle - I had to give up since I couldn't spend long enough on it, and come back the next day. If a puzzle is extremely hard without warning then it's unreasonable to expect people to magically have enough time set aside at the moment they discover this. It also takes away the fun of it, and means those who don't have other commitments have a definite advantage. ;)
@ 2016-02-20 7:42 AM (#21057 - in reply to #20393) (#21057)Quote Reply Top

aldentea



Posts: 10

Country : Japan

aldentea posted @ 2016-02-20 7:42 AM

In the [Others' solve] view, is it impossible to resume playing once [Stop Playing]? I hope it's possible.
@ 2016-02-21 12:11 AM (#21070 - in reply to #20393) (#21070)Quote Reply Top

CTC Comments



CTC Comments posted @ 2016-02-21 12:11 AM

Comments on 2016-02-18's Tapa
rob commented at 2016-02-18 04:18:32
Fun! As usual, I'm fastest when I make mistakes that turn out to be right.
marred commented at 2016-02-18 11:53:05
Nice beginings in many parts of diagram, but later problems with connecting it al togheter
@ 2016-02-21 11:49 AM (#21073 - in reply to #21054) (#21073)Quote Reply Top

debmohanty




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Country : India

debmohanty posted @ 2016-02-21 11:49 AM

CTC Comments - 2016-02-20 12:10 AM

gareth commented at 2016-02-18 00:16:34
Far too hard for a daily puzzle - I had to give up since I couldn't spend long enough on it, and come back the next day. If a puzzle is extremely hard without warning then it's unreasonable to expect people to magically have enough time set aside at the moment they discover this. It also takes away the fun of it, and means those who don't have other commitments have a definite advantage. ;)

Good point. We plan to add a difficulty level in the next episode of CTC.
@ 2016-02-21 8:41 PM (#21080 - in reply to #21044) (#21080)Quote Reply Top

cheese



Posts: 2

Country : Hungary

cheese posted @ 2016-02-21 8:41 PM

cheese - 2016-02-18 9:46 PM

I could not submit my solution (18th Feb) when I finished solving it (about 20 minutes before deadline). I tried again then some minutes later again but could submit only after a half hour.


Deb, sorry for disturbing again, could you check if I had the same problem as Nilz? Thank you!
@ 2016-02-22 12:12 AM (#21083 - in reply to #20393) (#21083)Quote Reply Top

CTC Comments



CTC Comments posted @ 2016-02-22 12:12 AM

Comments on 2016-02-19's Tapa
olejar commented at 2016-02-19 00:44:32
Today I had a 30 minutes interruption of internet connection during of solving task :-(
katarina commented at 2016-02-19 01:13:45
me too, i couldnt send solution
tamz29 commented at 2016-02-19 17:16:07
Can I finally get a 1st place finish???
debmohanty commented at 2016-02-19 17:22:20
26 seems like a winning score !!
tamz29 commented at 2016-02-19 17:24:21
I'll check back in 8 hours ;)
swaroop2011 commented at 2016-02-20 08:38:23
easy one to give yourself relief :)
@ 2016-02-22 12:30 AM (#21084 - in reply to #20393) (#21084)Quote Reply Top

AndreyBogdanov



Posts: 42
2020
Country : Russia

AndreyBogdanov posted @ 2016-02-22 12:30 AM

Is it possible that 22 Feb puzzle has duplicate solution? I'm stupidly looking to my solution for already 20 minutes and can't find any mistalkes.
@ 2016-02-22 12:33 AM (#21085 - in reply to #20393) (#21085)Quote Reply Top

prasanna16391



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prasanna16391 posted @ 2016-02-22 12:33 AM

As it happened a few days ago, an incorrect solution seems to have been entered in the background. That is fixed now, and the timings of the 'incorrect' submissions which match the actual solution will be in the system and edited to reflect on the score page soon.
@ 2016-02-22 12:37 AM (#21086 - in reply to #20393) (#21086)Quote Reply Top

AndreyBogdanov



Posts: 42
2020
Country : Russia

AndreyBogdanov posted @ 2016-02-22 12:37 AM

Thanks, now I've click submit again in the same solution and got it. I thought I was going crazy :)
Classic Tapa Contest — 2nd January - 20th February 2016Reply 129 posts • Page 4 of 6 • 1 2 3 4 5 6
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