SM 2024 R1 - Standard & Irregular (9^{th} - 15^{th} Feb) Score •Discuss

PR 2024 R2 - Loops & Numbers (23^{rd} - 29^{th} Feb) Score •Discuss

PR 2024 R2 - Loops & Numbers (23

Number Placement and Object Placement - 23rd - 27th Feb 2018 - Puzzle Ramayan & IPC Qualifier45 posts • Page 2 of 2 • 1 2

@ 2018-02-28 3:12 PM (#24369 - in reply to #24351) (#24369) Top | |

Posts: 349 Country : India |
chaotic_iak - 2018-02-26 1:10 PM These are some incredible puzzles. Some difficult ones, too. Partiti is a really tough genre, but that's probably just because it's very new; the logic was really nice. But not only that; all of them in general are very good puzzles. The only complaint is answer keys; for Battleships, I believe the usual answer key is "leftmost ship segment in each row", and I much prefer that than locating submarines. (Or if we need to locate submarines, at least give us the row numbers.) And for Partiti, I feel like putting the largest number only feels off (would probably be better "put all numbers in each cell from lowest to highest"). But minor complaints; the puzzles themselves are top-notch. Thanks for your feedback Ivan. We realized the error in Battleship formatting after the booklet had been published and the test had started. We will note this for future contests. The answer key for Partiti was based on the need for fixed length answer keys for real time validation of answer keys. Partiti usually solves bottom up, the smaller numbers get filled in earlier than the larger ones, hence we went with the answer key for the test. |

@ 2018-02-28 3:18 PM (#24370 - in reply to #24356) (#24370) Top | |

Posts: 349 Country : India |
Para - 2018-02-26 7:36 PM I did enjoy the puzzles, but I think that maybe too many puzzles needed the right insight and I used uniqueness maybe a bit too much to get through this whole set. Also, is there like a non-japanese ranking in these things? ;) I agree with your comment on uniqueness. It gets used quite a bit and especially in Partiti2 with the center 9 boxes missing, they have to be 1-9 to ensure uniqueness. |

@ 2018-02-28 3:21 PM (#24371 - in reply to #24358) (#24371) Top | |

Posts: 349 Country : India |
utkaarsh - 2018-02-26 8:56 PM The difficulty of puzzles would either motivate non-regular solvers to practice much more or drive them away I hope it is the prior. Some of these puzzles required a bit of prior work in identifying strategies for solving these puzzles types. Hope this encourages newcomers to discuss solving techniques for the new types once the IB is released for each round. |

@ 2018-02-28 3:47 PM (#24372 - in reply to #24367) (#24372) Top | |

Posts: 349 Country : India |
I would like to thank Tiit and Rakesh for testing the puzzles and providing valuable feedback, especially pointing out errors/non-uniqueness in 2-3 puzzles. Their timings also aligned with my anticipation of puzzle difficulty and I was in general happy with the point distribution except for one instance where in hindsight I made the mistake of overruling their timing in Half Dominoes -3 where I expected that it would be one of the easier puzzles with all the column and row sums being given. We were aware that the set is a lot tougher than the previous round, but the only option we had was to reduce the number of puzzles, which would mean departure from the set pattern for PR rounds. This is something we could consider in future years. I wanted to introduce a different solving strategy in each puzzle type and succeeded for most puzzle types except Futoshiki. I was especially happy with Statue Park where each of the 5 puzzles including the exploratory variants had a different solving strategy. Partiti was the favorite puzzle type in the set. Thanks to Thinh Van Duc Lai for introducing the puzzle type to all of us. I would also like to thank Ashish whose Partiti puzzles from WPC 2017 inspired the puzzles in this test. The theme was obvious in some types like Statue Park and Battleship but a bit more obscure in Futoshiki and Ripple Effect. This is the 10th year of LMI so I though the theme would be appropriate for this contest. Thanks to all the participants for adding colour to the event and providing valuable feedback. Congrats to all the participants who were able to complete the set in the allotted time. I hope others enjoyed solving the rest of the puzzles offline. Do post here if you are stuck on any of the puzzles and I would be glad to provide hints on my intended solving path. |

@ 2018-02-28 5:39 PM (#24373 - in reply to #24217) (#24373) Top | |

Posts: 34 Country : Turkey |
The time count in the homepage is confusing. I wanted to start test while it was declaring the test will end in 50 minutes. But, I could not start the test in the contest page, as it said I should have started 40 minutes earlier. |

@ 2018-03-01 12:59 AM (#24375 - in reply to #24217) (#24375) Top | |

Posts: 102 Country : United States |
Can anyone give some hints for solving Partiti-3? I was able to prove that the bottom left corner has a 2 under an 8, and the bottom right corner has a 3 under a 7 (i.e. those four boxes only have a single number in them). But past that I'm pretty stuck. Edited by ghirsch 2018-03-01 12:59 AM |

@ 2018-03-01 12:19 PM (#24386 - in reply to #24375) (#24386) Top | |

Posts: 349 Country : India |
ghirsch - 2018-03-01 12:59 AM Can anyone give some hints for solving Partiti-3? I was able to prove that the bottom left corner has a 2 under an 8, and the bottom right corner has a 3 under a 7 (i.e. those four boxes only have a single number in them). But past that I'm pretty stuck. Since all the number appear in a cluster (11, 10, 9, 8 and 7) identify the possible combinations for these numbers so that can appear together in a 2X2 box of cells. |

@ 2018-03-01 4:40 PM (#24387 - in reply to #24217) (#24387) Top | |

Posts: 170 Country : Germany |
Thanks Amit, I really enjoyed the puzzle set. The Partiti puzzles in particular were a lot of fun, though they feel very slow to solve to me. (Also I can see that it would be a tough set for for the usual PR target group.) |

@ 2021-02-26 12:02 AM (#28950 - in reply to #24217) (#28950) Top | |

Posts: 80 Country : Canada |
What's the password for this? It's not showing on the contest page itself. |

@ 2021-02-26 7:27 AM (#28952 - in reply to #28950) (#28952) Top | |

Posts: 72 Country : South Korea |
achan1058 - 2021-02-26 3:02 AM What's the password for this? It's not showing on the contest page itself. PW = 2isharderthan1 |

@ 2021-04-14 3:01 PM (#29116 - in reply to #24241) (#29116) Top | |

Posts: 1 Country : United States |
nice |