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Questions tagged [cops-and-robbers]

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0
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0answers
98 views

Scratch 2.0 is no longer considered a “free” language. Does this retroactively make cops-and-robbers cop answers in Scratch 2.0 non-competitive?

As per this question's answers, Scratch 2.0 is no longer considered a "free" language. As per this question's accepted answer, non-free languages are allowed if marked as non-competing. Scratch 2.0 ...
10
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3answers
508 views

In machine code, is using “illegal” opcodes a valid crack?

Regarding this suggested crack, do I have to accept it as valid? The code there is not valid 6502 machine code because it uses an opcode that doesn't exist (and won't work / crash on CMOS variants of ...
1
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0answers
70 views

Alternative winning criterions for cops and robbers challenges?

Sometimes the classic CnR winning criterion: Cops If your submission has not been cracked within a week, it is considered safe. The shortest safe submission wins. Robbers The robber ...
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0answers
91 views

Would it be accepted to have a “cops and robbers” thread with only one side?

I would like to mainly give myself programming challenges by basically asking multiple times to break my previous code. This would be like the "cops and robbers" format on PP&CG, only that I would ...
3
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9answers
185 views

Viable input forms in Cops and Robbers challenges

So, recently in the Hello World CnR challenge I've come across this crack to my submission. I don't think it's ever clearly defined before in any CnRs what exactly is allowed as an input and what is ...
7
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1answer
241 views

Can I make a CnR with no winning criteria for Cops?

I've had two challenge ideas floating around in my head for a while. I'll spare the details but as a general overview: The first is a challenge that should, in principle, be fun but in practice it is ...
1
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0answers
212 views

How to prevent crypto while allowing string idx, etc in CnR

In my new sandboxed challenge, I'm looking to ban crypto / one-way functions that make it impossible to get the input from the output. I started out requiring only using functions that are bijectve, ...
0
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1answer
53 views

Two CnR with same CnR idea [closed]

I had the idea to make a CnR where the cops present non-golfed code and the robbers present the golfed version. I found out it was a dupe :( but wanted to know. If you have a CnR challenge and make ...
3
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1answer
113 views

For cops and robbers, what if the cops' thread is closed / put on hold?

If someone posts a cops-and-robbers challenge and the cops' thread is closed / put on hold, for any reason (e.g: unclear what you're asking), what should happen to the robbers' thread? Should it be ...
18
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1answer
484 views

Allowing non-free languages in Cops and Robbers challenges when marked as non-competing

Non-free languages are not allowed to participate in Cops and Robbers challenges. And that's a good thing. If you choose an obscure non-free language, no one will be able even to attempt solving it ...
2
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1answer
121 views

How might I reward a Robber for an especially good crack?

To keep a concise title I have left out a few details, but here is the dilemma: I have a cops post that has not yet been cracked. I would like to reward the first person to figure out my solution ...
25
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2answers
508 views

Add randomization in CnR posts as a loophole?

I want to add a loophole about random stuff in CnR challenges to the standard loophole list, but I have a hard time formulating the post in a way that won't result in a lot of "... but what about xyz?"...
5
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2answers
239 views

Post a crack to a cracked CNR submission

When answering a CNR challenge it's common to get the response: "Well done, but that was definitely not what I had in mind". I feel like it should be perfectly fine for anyone to post a second crack ...
3
votes
1answer
119 views

What are the guidelines for formulating a Cops and Robbers style challenge?

I've been slowly forming in my head a question for a Cops and Robbers style code challenge, and it occurred to me that I actually don't really know the general details of how they're set out... Is ...
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5answers
1k views

What constitutes a “free” language for cops and robbers?

Recently Isaac proposed that using non-free, i.e. pay-to-use, languages for cops and robbers challenges should be considered a standard loophole. As Dennis stated in a comment, there is some ambiguity ...
18
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1answer
537 views

Where should we put robbers?

Just in case you didn't know already, we have a fairly new type of challenge: cops-and-robbers I enjoy these challenges very much, but I don't know if the current format (cops post answers, robbers ...