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 Congratulations on the site's 10 year anniversary! 
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Posted on: Mon Feb 11, 2019 10:54 am




Posts: 42
Joined: Fri Jan 13, 2017 2:51 pm
Post Re: Congratulations on the site's 10 year anniversary!
Late to chime in, but a heartfelt congratulations Patrick!

Not sure if we are going to hit 20 million this year, since that would require about 270 000 puzzles a month being solved henceforth. That is quite a steep ask.


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Posted on: Mon Feb 11, 2019 12:31 pm




Posts: 2606
Joined: Thu May 12, 2011 11:58 pm
Post Re: Congratulations on the site's 10 year anniversary!
skeeter84 wrote:
You never know - we just might hit 20 million puzzles in 2019 as well!

I'd better start computing that 20 x 20 puzzle for the occasion [blink]


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Posted on: Mon Feb 11, 2019 2:44 pm




Posts: 570
Location: Dublin, Ireland
Joined: Tue Mar 01, 2016 10:03 pm
Post Re: Congratulations on the site's 10 year anniversary!
pnm wrote:
skeeter84 wrote:
You never know - we just might hit 20 million puzzles in 2019 as well!

I'd better start computing that 20 x 20 puzzle for the occasion [blink]


That's given me an idea. You could celebrate each additional million solved puzzles by issuing a puzzle of matching size - 18x18 for 18 million and so on.


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Posted on: Mon Feb 11, 2019 3:24 pm




Posts: 2606
Joined: Thu May 12, 2011 11:58 pm
Post Re: Congratulations on the site's 10 year anniversary!
paulv66 wrote:
That's given me an idea. You could celebrate each additional million solved puzzles by issuing a puzzle of matching size - 18x18 for 18 million and so on.

Puzzles beyond 17 x 17 will require a lot of work on the solver though [scared]


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Posted on: Mon Feb 11, 2019 3:56 pm




Posts: 570
Location: Dublin, Ireland
Joined: Tue Mar 01, 2016 10:03 pm
Post Re: Congratulations on the site's 10 year anniversary!
pnm wrote:
paulv66 wrote:
That's given me an idea. You could celebrate each additional million solved puzzles by issuing a puzzle of matching size - 18x18 for 18 million and so on.

Puzzles beyond 17 x 17 will require a lot of work on the solver though [scared]


I didn't realise that. What's the significance of 17x17 as a cutoff point?


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Posted on: Mon Feb 11, 2019 4:07 pm




Posts: 2606
Joined: Thu May 12, 2011 11:58 pm
Post Re: Congratulations on the site's 10 year anniversary!
paulv66 wrote:
I didn't realise that. What's the significance of 17x17 as a cutoff point?

Not significant, it's just the practical limit (given the hardware I have here [mellow] )

Compute time increases exponentially with increasing puzzle size (more or less)


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Posted on: Mon Feb 11, 2019 5:20 pm




Posts: 260
Joined: Fri Jun 17, 2011 8:15 pm
Post Re: Congratulations on the site's 10 year anniversary!
pnm wrote:
paulv66 wrote:
I didn't realise that. What's the significance of 17x17 as a cutoff point?

Not significant, it's just the practical limit (given the hardware I have here [mellow] )

Compute time increases exponentially with increasing puzzle size (more or less)

For me the compute time definitely increases exponentially with increasing puzzle size. Maybe I need better hardware.

Kidding aside, this site has been a surprisingly important part of my day to day life for most of the last eight years, bringing me much enjoyment (and a little frustration from time to time :-) ). I'm sorry I missed out on the first two years, but am grateful for the rest of the ten. Many heartfelt thanks and congratulations to you, Patrick!


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Posted on: Wed Feb 13, 2019 1:14 am




Posts: 570
Location: Dublin, Ireland
Joined: Tue Mar 01, 2016 10:03 pm
Post Re: Congratulations on the site's 10 year anniversary!
Just wondering if anyone has had a problem with submitting y2018. I tried submitting it just now and was told it was an incorrect solution. I've checked and rechecked it and can't find any mistakes. I wonder is there a non unique solution, as happened with y2009?


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Posted on: Wed Feb 13, 2019 1:22 am




Posts: 570
Location: Dublin, Ireland
Joined: Tue Mar 01, 2016 10:03 pm
Post Re: Congratulations on the site's 10 year anniversary!
paulv66 wrote:
Just wondering if anyone has had a problem with submitting y2018. I tried submitting it just now and was told it was an incorrect solution. I've checked and rechecked it and can't find any mistakes. I wonder is there a non unique solution, as happened with y2009?


I've found a second solution, so it looks like that's the problem. The second solution was also rejected, but I had already submitted two puzzles today. And I think there's a third possibility, which I going to try to test next.


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Posted on: Wed Feb 13, 2019 1:50 am




Posts: 570
Location: Dublin, Ireland
Joined: Tue Mar 01, 2016 10:03 pm
Post Re: Congratulations on the site's 10 year anniversary!
paulv66 wrote:
paulv66 wrote:
Just wondering if anyone has had a problem with submitting y2018. I tried submitting it just now and was told it was an incorrect solution. I've checked and rechecked it and can't find any mistakes. I wonder is there a non unique solution, as happened with y2009?


I've found a second solution, so it looks like that's the problem. The second solution was also rejected, but I had already submitted two puzzles today. And I think there's a third possibility, which I going to try to test next.


I went back over it and found 3 more solutions. The first of these was accepted as correct, but no points awarded as I had already submitted two book puzzles today.

The problem arises when you get down to the last few cells in the two large cages. At that stage, all the other cages have been completed apart from a two cage near the largest cage. I was unable to arrive at a logical way of deciding how to resolve the remaining cells, so I tried one of the alternatives. This led to a completed solution, which was not accepted. I retraced my steps from that point onwards and found four more possible solutions.

Partick, I will be happy to send on all five solutions to you if you would find this helpful. I've saved them in a spreadsheet.


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