Puzzle Ramayan - 2020

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rakesh_rai
Posts: 10
Joined: Sun 31 Oct, 2010 7:49 am

Puzzle Ramayan - 2020

Post by rakesh_rai » Sat 25 Jan, 2020 4:34 pm

The new season for Puzzle Ramayan 2020 has just started on LMI. The first contest started on 24th January and runs till January 28th. Here is the complete schedule:

Classics: 24-28 Jan 2020
Number and Object Placement: 21-25 Feb 2020
Shading and Loops: 20-24 Mar 2020
Evergreens: 17-21 Apr 2020
Casual & Word: 22-26 May 2020
Made In India & Regions: 19-23 Jun 2020

http://logicmastersindia.com/forum

Feadoor
Posts: 178
Joined: Thu 17 May, 2018 7:08 am

Re: Puzzle Ramayan - 2020

Post by Feadoor » Thu 30 Jan, 2020 3:21 pm

A good UK showing, with 6 of us finishing the full set. Our top 3:

16. Neil Zussman - 126.1 (63:53)
39. Freddie Hand - 113 (77:01)
44. James McGowan - 106.8 (83:13)

pinkagape
Posts: 93
Joined: Mon 30 Apr, 2012 4:11 pm

Re: Puzzle Ramayan - 2020

Post by pinkagape » Thu 30 Jan, 2020 7:39 pm

The kakuro really slowed me down.

I feel like there must be some technique to go faster. Is there anything anyone has found to help speed up a kakuro?

Puzzle_Maestro
Posts: 83
Joined: Mon 11 Mar, 2019 5:23 pm

Re: Puzzle Ramayan - 2020

Post by Puzzle_Maestro » Fri 31 Jan, 2020 5:40 pm

One technique I used quite a lot was summing horizontally and vertically to find the value of a cell (as in, taking the sum of all horizontal clues covering a region and comparing to the sum of all vertical clues in the same region). This technique can also be helpful to find the sum of two squares which can impose useful restrictions. Although you were probably already doing this or you couldn't have finished any of the kakuro!

Bifurcation is usually quite effective for kakuro, especially for regions isolated from the rest of the puzzle, and when you have almost completed the puzzle.

If you attempted 15.Kakuro (the one with digit range 1-9), you may have underestimated the importance of the 43 and 44 clues. Using the 43 I was able to place the 9 and 8 in the column which then unlocked the whole upper left. In general, almost all kakuro logic boils down to 'extremal' logic (looking at large/small clues and large/small numbers), 'visualisation' logic (placing some digit eventually leads to a contradiction; I often find this logic easier to see with lots of pencilmarks) or 'summation' logic (summing clues to obtain information about certain cells). I'm hardly an expert at kakuro though, someone else may be able to offer something more helpful!

pinkagape
Posts: 93
Joined: Mon 30 Apr, 2012 4:11 pm

Re: Puzzle Ramayan - 2020

Post by pinkagape » Fri 31 Jan, 2020 9:08 pm

Thank you very much. That’s good to hear.

Feadoor
Posts: 178
Joined: Thu 17 May, 2018 7:08 am

Re: Puzzle Ramayan - 2020

Post by Feadoor » Wed 26 Feb, 2020 9:55 pm

Round 2 UK results:

23. James McGowan - 95
41. Jeremy Kong - 84.3
46. Sam Cappleman-Lynes - 81.8

Like with the Sudoku Round 2 (by one of the same authors), this was much tougher than Round 1. James is joint top among non-finishers.

Puzzle_Maestro
Posts: 83
Joined: Mon 11 Mar, 2019 5:23 pm

Re: Puzzle Ramayan - 2020

Post by Puzzle_Maestro » Wed 25 Mar, 2020 8:49 pm

Round 3 UK results:

10. Freddie Hand - 150.2
27. James McGowan - 140.1
61. Tom Collyer - 118.5

A nice and easy test this round, with 87 finishers in total. Sadly, printer troubles denied me from obtaining a better result (my first submission was at 4:28) but still fairly pleased with my result. Ken finishing in 20 minutes is positively inhuman: more than 7 minutes clear of a very competitive field.

Feadoor
Posts: 178
Joined: Thu 17 May, 2018 7:08 am

Re: Puzzle Ramayan - 2020

Post by Feadoor » Thu 26 Mar, 2020 9:20 am

Puzzle_Maestro wrote:
Wed 25 Mar, 2020 8:49 pm
Ken finishing in 20 minutes is positively inhuman.
There were... *checks notes* ... 22 puzzles. Factoring in time for printing and answer keys, you're probably looking at about 45-50 seconds a puzzle, which I think is about as fast as I could do it if I was just copying the answers.

Well done to you as well, Freddie!

Puzzle_Maestro
Posts: 83
Joined: Mon 11 Mar, 2019 5:23 pm

Re: Puzzle Ramayan - 2020

Post by Puzzle_Maestro » Wed 22 Apr, 2020 8:06 pm

Round 4 UK results:

13. Freddie Hand - 111.6
18. James McGowan - 107.5
42. Sam Cappleman-Lynes - 84

Good to see Sam achieve a good puzzle result!

A rather tough round this time, with only 28 finishers. Ken Endo wins as usual, although not by as huge a margin as last round.

Puzzle_Maestro
Posts: 83
Joined: Mon 11 Mar, 2019 5:23 pm

Re: Puzzle Ramayan - 2020

Post by Puzzle_Maestro » Wed 27 May, 2020 8:33 pm

Round 5 UK results:

1. Freddie Hand - 132.8 (53:25)
20. James McGowan - 102.7 (87:16)
33. Adam Bissett - 89.4

A rather low UK participation, made up for by a strong showing, with all 5 competitors finishing in the top 50.

Quite pleased to finally win a competition after coming close in the Alphabet contest. I struggled over some puzzles - most notably the matchsticks due to not reading the rules carefully and thinking that the solution had to be as large as possible, costing me 4 minutes and 2.1 points on Matchsticks 3 - but I also had very quick solves for other puzzles, especially Curve Data, taking a little over 3 minutes for the set.

As I gather from the discussion thread, one of the intended rules for matchsticks was 'each matchstick can only be moved once'. That makes the solution to matchsticks 3 a lot clearer, though this should definitely have been clarified in the original rules.

Feadoor
Posts: 178
Joined: Thu 17 May, 2018 7:08 am

Re: Puzzle Ramayan - 2020

Post by Feadoor » Thu 28 May, 2020 3:46 pm

Very nicely done, Freddie!

Puzzle_Maestro
Posts: 83
Joined: Mon 11 Mar, 2019 5:23 pm

Re: Puzzle Ramayan - 2020

Post by Puzzle_Maestro » Thu 25 Jun, 2020 8:13 pm

Round 6 UK results:

4. Freddie Hand 147.4 (42:11)
29. James McGowan 124.8 (64:48)
74. Jeremy Kong 83.3

Overall, a very nice set of puzzles to round off this year's series. Struggled massively with the rangolis; took about 6 minutes for each of the 8x8s. Second place was definitely possible with more thorough preparation.

Ken once again finishes in an absolutely incomprehensible time. Even with the rangolis removed, I would have been slower than him!

kiwijam
Posts: 705
Joined: Wed 01 Jun, 2011 10:03 am

Re: Puzzle Ramayan - 2020

Post by kiwijam » Sun 28 Jun, 2020 7:46 am

Well done Freddie! When I last looked it said you spent 16 attempts and 50 minutes struggling with one puzzle. Was it a bad answer key in the end?

Puzzle_Maestro
Posts: 83
Joined: Mon 11 Mar, 2019 5:23 pm

Re: Puzzle Ramayan - 2020

Post by Puzzle_Maestro » Sun 28 Jun, 2020 9:23 am

That was because the initial version of the last pentominous borders was faulty (the 4 had been transposed down a cell). The points have now been refunded.

The reason why I attempted the obviously wrong puzzle so many times is that I thought it was possible that a border had simply been omitted and was hoping to guess the right answer, in the very unlikely scenario that I would not be refunded points.

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