Due to some unforeseen personal issues for one of the core organizers, we are having to postpone the Indian Championships. Both ISC and IPC will be postponed by two weeks each. The new dates are:
ISC - December 12th-13th
IPC - December 19th-20th.
More details will be announced soon.
We request you all not to look further into the matter out of respect for privacy.
On a positive note, we will use this extra time to continue testing our new non-flash submission page and results page and have those 100% ready in time for ISC.
Thank you for your patience and understanding, and we apologize for the inconvenience caused.
Round 5: Tapa-Nurikabe
1. Can Clue in Nurikabe extend in Tapa Region and include a given Tapa clue (sole or multiple number clue) as part of Island?
2. Can a Sole Tapa Clue act as Both Tapa as well as Nurikabe Clue?
Thanks, Rakesh for clarifying most of my doubts.
Hope my understanding is clear on this now. As per my understanding, a given Nurikabe clue cannot include Sole or Multiple Tapa clues in the Island. Please correct me if my understanding is wrong.
1) "Official" round timings: The official start timings for each round will be strictly followed for each round as in IB page 2.
2) Adobe Flash Player will be needed to participate in this contest.
3) Round 4 - Mark My Puzzles - The rules for the three puzzle types will be included on the page.
4) Round 4 - Numerical Jigsaw - Same font as in the IB shall be used for the vertical strips.
5) Round 5 - Ayeheya - The symmetry shall be with respect to the central point in the region.
6) Round 5 - Tapa+Nurikabe - Tapa clues can double up as nurikabe clues if that is the only clue in the island and if it is a single number.
7) Round 3 - Aquarium - Every region behaves as if we are pouring water from the top. So any two cells in a region (even if separated by other regions) either both have water or are both empty.
8) Round 5 - Tapa+Nurikabe - There cannot be two clues in a nurikabe island. There must be at least one "white" cell from nurikabe area to call it an island.
9) Round 1 - Rassi Silai and Tents - If the leftmost column is the 10th column, enter 0.
10) Round 1 - Battleships - Fleet shall be given and given ship segment cells will contain same shape as in given fleet.
11) Round 4 - Numerical Jigsaw - Change the wording to "Rotate and/or rearrange some or all of the given vertical strips"
12) Round 4 - IPC Criss Cross - There shall be validation for minimum length of the answer.
13) Round 4 - Numerical Jigsaw - Puzzle numbering shall be 10 and 11 for the two puzzles.
14) Round 3 - Products (Off by one) - Specific range of numbers shall be given in the PB.
15) Round 4 - Meteor Showers - Validation shall be added to the length of the answer
16) Round 3 - Top Heavy - The rules apply only for vertical neighbours (number at the top shall be bigger). There are no constraints for horizontal neighbours.
17) Round 4 - Banners - All words shall be listed vertically.
18) Round 5 - Masyu rule - The text "the path must not turn when it passes through a black pearl" should omit the 'not'
A big thanks to the organizers for putting together the five rounds for this IPC. Each and every round was very enjoyable and had loads of memorable puzzles.
The points and time allocation for each round was spot on.
Special thanks to Rakesh, Priyam and Deb for putting in so many hours of effort and for the perfect execution even with limited support. (I hope I am not missing anyone out.)
Also thanks to all the authors for the fantastic puzzles. I will share my thoughts on the puzzles after solving the ones that I missed out during the contest.
There was a second valid answer in the puzzle "Three Steps". Anyone who has submitted any of the correct answers has been given complete points for this puzzle. Also, almost everyone who did not get it right in Instant Grading submitted the correct answer for this puzzle later. Pro-rata compensation has been provided to such cases depending on their performance in the round and the time lost. (This pro-rata compensation shall be included in the Official results but not in the Unofficial results.)
This was discussed in detail and is the final decision of the organisers with regard to Round 4.
Thanks to Rakesh, Priyam, Deb and all the foreign contributors for this fantastic IPC. High quality puzzles and just like the ISC, very well organized.
Really appreciate all the efforts in making these championships happen during a difficult year.
Congratulations to Prasanna and Swaroop for the podium and to Jayant, Gaurav and Nityant for topping PR.
That was incredibly enjoyable, many thanks to all authors and organisers! A few comments on each round:
Round 1: All of the puzzles were very nice. Especially liked the Yajilin, Kakuro and Pentominous.
Round 2: The compass was a really stunning puzzle. Statue Park felt over-valued.
Round 3: Tough round; had quite some difficulty with numerous puzzles, including the domino search which I ended up effectively brute-forcing. The Kurotto was excellent and I also enjoyed the Aquarium quite a bit.
Round 4: A fun, different round. Hard to pinpoint favourites here. Was rather lucky to solve the 'three steps' puzzle in about 30 seconds.
Round 5: A bit annoying to solve on paper; ended up having to resort to coloured pens, which ended up working ok. Perhaps it's fortunate that the puzzles here weren't too difficult... I really loved the concept though!
Thank you to organizers Priyam, Rakesh and Deb for putting together IPC ! Fantastic set of puzzles ! Can't imagine the amount of work that must have gone in the background to organize another week of contest and special applause for that. Thank you to all authors too for creating amazing puzzles !
My story of the day was wasting the last 10-15 mins of each and every round by jumping from puzzle to puzzle or getting stuck on a puzzle. It started with Rassi Silai in Round 1 where I had 17 mins when I approached the leftmost region having 6 turns and could never get it to work . Spent about 15 mins on that and still couldn't see how to place it.
My favourite of the day was Ayeheya Yajikazu (100 points) from Round 5. I simply loved how the logic unfurled in that. Will look to solve the leftout ( and that's quite a few) in the coming days.
LMI thanks all the international authors and test solvers for their valuable contribution to IPC 2020.
Thanks Cedomir Milanovic, Craig Kasper, Ivan Koswara, Nikola Zivanovic, Tawan Sunathvanichkul, Walker Anderson, Bram De Laat, Branko Ceranic, Deyan Razsadov, Ken Endo, Matej Uher, Rob Vollmert, Taus Brock-Nannestad, Wang Weifan, Yanzhe Qiu and Yuhei Kusui!