Here are the names of the people who solved each cipher, in chronological order, together with links to the corresponding areas of cp4space.

**Jigcypher:**Solved independently by ‘Dejig Unshred’, collaboratively by Sam Cappleman-Lynes and Florence Salter, then later by Bo-Gyu Jeong, Joseph Myers, Alex Dixon, Andrew Carlotti, Maria Holdcroft, Robert March, Dave Roberts, Stuart Gascoigne, Jeremy Tan, Scott Walker and Not Monika.**Maze cipher:**Solved by Patrick Stevens, Sam Cappleman-Lynes, Vishal Patil, Maria Holdcroft, Joseph Myers, Alex Dixon, Andrew Carlotti, Greg Childers, Robert March, Dave Roberts, Joel Wales, Stuart Gascoigne, Scott Walker, Beni Bogosel, Ross Presser and Not Monika.**Chess cipher:**Solved by Maria Holdcroft, Sam Cappleman-Lynes, Vishal Patil, Joseph Myers, Andrew Carlotti, Robert March, Stuart Gascoigne, Dave Roberts, Scott Walker and Not Monika.**Irrationality:**Solved by Vishal Patil, Sam Cappleman-Lynes, ‘Wojowu’, Maria Holdcroft, Patrick Stevens, Joseph Myers, Bo-Gyu Jeong, James Cranch, Robin Elliott, Andrew Carlotti, Stuart Gascoigne, Robert March, Joel Wales, Dave Roberts, Scott Walker, Matei Mandache and Not Monika (**solvers’ area**).**99 problems or 23:**Solved by Vishal Patil, Sam Cappleman-Lynes, Stuart Gascoigne, Maria Holdcroft and Dave Roberts (**solvers’ area**).**Puzzling:**Solved by Sam Cappleman-Lynes, Vladimir Vankov, Maria Holdcroft, Stuart Gascoigne and Dave Roberts (**solvers’ area**).**Generalised RSA:**Solved by Sam Cappleman-Lynes, Bo-Gyu Jeong, James Cranch, Florence Salter, Maria Holdcroft, Joseph Myers, Andrew Carlotti, Greg Childers, Stuart Gascoigne and Dave Roberts (**solvers’ area**).**Aaaronsonian honeycomb:**Solved by Sam Cappleman-Lynes and Stuart Gascoigne (**solvers’ area**).**Christmas cryptography:**Solved by Joseph Myers, Maria Holdcroft, Sam Cappleman-Lynes, Patrick Stevens, Andrew Carlotti, Stuart Gascoigne, Robert March, Dave Roberts, Joel Wales, Scott Walker and Not Monika (**solvers’ area**).**2013:**Solved by Joseph Myers, Stuart Gascoigne and eventually Andrew Carlotti (**solvers’ area**).**Musical mayhem:**Solved by Joseph Myers, Maria Holdcroft, Sam Cappleman-Lynes, Andrew Carlotti, Stuart Gascoigne, Dave Roberts, Scott Walker, Matei Mandache and Oliver Feng (**solvers’ area**).**Knot homophonic:**Solved by Sam Cappleman-Lynes, Joseph Myers, Andrew Carlotti, Maria Holdcroft, Stuart Gascoigne, Robert March, Dave Roberts, Scott Walker, Matei Mandache and Not Monika (**solvers’ area**).**Intercardinal:**Solved by Joseph Myers, Maria Holdcroft, Stuart Gascoigne, Sam Cappleman-Lynes and Scott Walker (**solvers’ area**).**Remorse:**Solved by Joseph Myers, Stuart Gascoigne, Dave Roberts and Sam Cappleman-Lynes (**solvers’ area**).**Shuffled:**Solved by Joseph Myers, Maria Holdcroft, Richard Freeland, Neil Bickford, Stuart Gascoigne, Andrew Carlotti, Dave Roberts, Sam Cappleman-Lynes, Scott Walker, Nathan Ho and Not Monika (**solvers’ area**).**Scenic route:**Solved by Joseph Myers, Stuart Gascoigne, Maria Holdcroft, Nathan Ho, Andrew Carlotti, Sam Cappleman-Lynes, Not Monika and Dave Roberts (**solvers’ area**).**Hallucinogen:**Solved by Bo-Gyu Jeong, Joseph Myers, Stuart Gascoigne, James Cranch, Andrew Carlotti, Dave Roberts, Maria Holdcroft, Sam Cappleman-Lynes and Scott Walker (**solvers’ area**).**Enigma:**Solved by Joseph Myers, Stuart Gascoigne, Maria Holdcroft, Andrew Carlotti, Robert March, Gunnar Peng, Bo-Gyu Jeong, Dave Roberts, James Cranch, Sam Cappleman-Lynes, Matei Mandache and ‘Not Monika’ (**solvers’ area**).**Corrupted:**Solved by Joseph Myers, Stuart Gascoigne, Dave Roberts, Sam Cappleman-Lynes, Scott Walker, Not Monika and Andrew Carlotti (**solvers’ area**).**Ulam:**Solved by Stuart Gascoigne, Maria Holdcroft, Joseph Myers, Andrew Carlotti, James Cranch, Dave Roberts, Sam Cappleman-Lynes, Oliver Feng and Not Monika (**solvers’ area**).**Sudoku:**Solved by Kate Myers, Joseph Myers, Maria Holdcroft, Andrew Carlotti, Bo-Gyu Jeong, Stuart Gascoigne, James Cranch, Dave Roberts, Sam Cappleman-Lynes, Matei Mandache, Oliver Feng, Scott Walker and Not Monika (**solvers’ area**).**There be dragons:**Solved by Joseph Myers, Nathan Ho, Stuart Gascoigne, Andrew Carlotti, Robert March, James Cranch, Dave Roberts, Maria Holdcroft, Matei Mandache, Sam Cappleman-Lynes, Not Monika and Alexey Nigin (**solvers’ area**).**Orthogonal boustrophedons:**Solved by Azerbajdzan and Sam Cappleman-Lynes (**solvers’ area**).**ADFGVX:**Solved by James Cranch, Joseph Myers and Sam Cappleman-Lynes (**solvers’ area**).**My dear Watson:**Solved by Stuart Gascoigne, Andrew Carlotti, James Cranch, Maria Holdcroft, Dave Roberts, Scott Walker, Sam Cappleman-Lynes, Joseph Myers and Not Monika (**solvers’ area**).**Spaced out:**Solved by Nathan Ho, Kate Myers, Stuart Gascoigne, Andrew Carlotti, Joseph Myers, Dave Roberts, Maria Holdcroft, James Cranch, Scott Walker, Sam Cappleman-Lynes and Not Monika (**solvers’ area**).**Sunflower:**Solved by Andrew Carlotti, (dubiously) by Maria Holdcroft and Joel Wales, legitimately by James Cranch, and (also dubiously) by Stuart Gascoigne, Robert March and Joseph Myers, legitimately by Dave Roberts and Sam Cappleman-Lynes, dubiously by Oliver Feng and Richard Freeland, and legitimately by Not Monika (**solvers’ area**).**Irrationality II:**Solved by Joseph Myers, James Cranch, Andrew Carlotti, Maria Holdcroft, Stuart Gascoigne, Robin Elliott, Dave Roberts and Sam Cappleman-Lynes (**solvers’ area**).**Permutation:**Solved by Joseph Myers, James Cranch, Andrew Carlotti, Maria Holdcroft, Stuart Gascoigne and Sam Cappleman-Lynes (**solvers’ area**).**Finale:**Solved by Sam Cappleman-Lynes (**solvers’ area**).

Pingback: Cipher 4: Think rationally | Complex Projective 4-Space

Second solver for every single cipher… This will change when number 5 is released!

I anticipate intense competition…

Pingback: Miscellany | Complex Projective 4-Space

Pingback: Cipher 5: 99 problems or 23? | Complex Projective 4-Space

Pingback: The inadequacy of SCLT | Complex Projective 4-Space

Pingback: Recapping 2012 | Complex Projective 4-Space

Pingback: Cipher 10: 2013 | Complex Projective 4-Space

Pingback: Cipher 11: Musical mayhem | Complex Projective 4-Space

Pingback: Non-trivial mutual friends | Complex Projective 4-Space

Why is there no link to the thirteenth cipher?

Amended.

I’ve just noticed that the initial paragraph is incorrect – it says “each of the ciphers published every four weeks”.

You’re missing a link to the thirtieth cipher.

Well observed. As usual, there is now a link.

I presume you’re in Oundle now, are you not? Do you have anything interesting to report?

I would have mentioned the unusual circumstances which resulted in all four NSTs being sat in one day, but I reckon you’ve probably heard it all already.

Yes, I’ve heard about Geoff neglecting to separate the pile of NST1s from the master copies, and the resultant embargo on discussing maths for the remainder of the camp. Hehe… Anyway, what’s this I hear about you having a program to inform you of any instances of people commenting on cp4space?

It was a rather indirect result of me writing code to allow me to make submissions for the National Cipher Challenge via Python. Having written the code to handle my login details, I then decided to use it to monitor the forum there. I then extended the applet I created to monitor the cp4space comments feed too. This applet starts up automatically when my desktop computer goes on, and an envelope in the panel turns green when interesting stuff happens.

Apparently it’s able to determine when someone comments, even on areas you don’t have access to. Is this correct?

Oh, there’s a cp4space comments feed?

Yep. Ignoring the user interface, all my program does is download the page http://cp4space.wordpress.com/comments/feed/ and compare the update time to the one saved in a file.

Incidentally, over-reliance on this meant that I’ve only just discovered that Stuart has solved several more ciphers (and overtaken me). Although its possible that he has only just done them.