Read further · read 84.2% · ciphertext-only break · partial

The Electors of Mainz and Cologne to Geleen, 22 October 1633

A letter to the League general Gottfried Huyn von Geleen on the relief of Hildesheim and the army’s pay, with the sensitive words in two-digit numbers. Brice Dudout recovered the key from the numbers alone, tested it on five held-out lines (0.656 of letters in German words against at most 0.113 for shuffled keys) and read 186 of 221 cipher words. Nineteen words are lost in the binding of the microfilm, which caps the reading at 91.4%.

Date
1633
Read now
84.2% of the cipher tokens give sense
Write-up
geleen1633.html
Files
targets/geleen1633
Open gaps
needs the archive ×2hard to read on the scan ×2no key known

Hand this page to your AI agent

Give your agent (Claude, ChatGPT or any assistant that can open web pages) this address and ask it to do the task on the page:

https://dbourdeau.github.io/cyphersolver/further/geleen1633.html

Or copy the block below into the chat. It is the whole task: the reading, every open gap, what has been tried, the steps, and how to report back.

TASK: take a partial decipherment further: The Electors of Mainz and Cologne to Geleen, 22 October 1633
This page: https://dbourdeau.github.io/cyphersolver/further/geleen1633.html

You are helping a public research project finish reading historical cipher letters. This one is read in part:
the key works, but some pieces are still open. Your job is to close one or more of the open gaps below.

THE READING
  Write-up:   https://dbourdeau.github.io/cyphersolver/geleen1633.html (read it first: how the text was read, the key, the reading)
  Date:       1633
  Outcome:    ciphertext-only break · partial
  Read now:   84.2% of the deciphered cipher tokens give sense (pieces below may be untouched)
  Files:      https://github.com/dbourdeau/cyphersolver/tree/main/targets/geleen1633 (NOTES.md, key, transcription, reading, scripts)

OPEN GAPS (from NOTES.md, "## Remaining gaps")
  1. [needs-physical-access: needs a new source] 19 words cut or lost where the line ends of fol. 184v vanish into the gutter - blocker: needs-physical-access; the volume was microfilmed bound, only the original or a new photograph shows them (caps the reading at 91.4%)
  2. [needs-physical-access: needs a new source] 2 word ends at the cut (le, non) - blocker: needs-physical-access; same gutter
  3. [illegible: needs a new source] 4 words whose written numbers contradict the expected word (Statt, Weg, Wachtmeister, richten) - blocker: illegible; blind re-reading 4 Nov 2026 confirmed the numbers as transcribed, the enlarged microfilm gives no other reading
  4. [illegible: needs a new source] 2 runs without a recognisable word (derdselfemlh, anewerder) - blocker: illegible; re-inspected on the MDZ images (views 653, 654) 4 Nov 2026: in derdselfemlh the film shows 17 22 13 17 18 3?/2? 17 23 18 25 with no clear second 21 and 2/3/5 and 7/8 not separable, so derselbe mehr is possible but not verifiable; in anewerder the film shows 30 ?1 17 19 17 22 (17|21 17) 22 where one pair reads as 11, not a number of the key. The microfilm does not settle either; the transcription is left as written
  5. [no-key-material: needs a new source] values of 33 and 38 - blocker: no-key-material; rare, no clear context

ALREADY TRIED (from NOTES.md, "## Escalation")
  [x] siblings: nos. 205-207 of Clm 10406 opened; no decipherment or clear copy among them
  [x] clear-pages: no clear copy or postscript on the letter or its neighbours
  [x] known-keys: Camerarius 1621, Rakoczi 1632 and Kurz 1638-39 tested by a frozen criterion; none applies
  [x] print: no folder or reading in the repository or on DECODE, nothing from Tomokiyo; Bierther (1982) not online and its snippets do not list the letter; web search 4 Nov 2026 for the letter, Menselius and Lerchenfeld found nothing
  [x] key-rebuild: annealing with a 17th-century German model, then three corrections from clear context (vom Feind, Kniphausen, Geltmittel), frozen
  [x] retry: blind re-reading plate of 20 questions on 14 words answered 4 Nov 2026: 9 words now certain, 4 dropped to unresolved

STEPS
0. Set up. If you can run a shell, fork and clone the repository and work inside it:
     git clone https://github.com/dbourdeau/cyphersolver.git
   Then read, in this order: CONTRIBUTING.md (how a contribution is sent and credited); README.md, sections
   "Repository layout" and "Conventions" (how readings are measured and named); targets/geleen1633/NOTES.md in full, and the
   key, transcription and reading files it names; lang/README.md (shared language models).
   Work in targets/geleen1633/. Add your findings to NOTES.md under a dated heading without rewriting what is there, and
   update the "## Remaining gaps" line of every gap you close. Keep WORKLOG.md there: one dated line per step
   (hypothesis, value tried, solver run, crib, control), failures included. Do not edit docs/ (the site is generated).
   If you cannot run a shell, fetch the files from the links above and keep your work in files you send with the issue.
1. Pick a gap. Start with the ones marked "doable now" (open-codes, not-attempted, left-open): the images and the key
   are online, so they need only work. A gap marked "needs a new source" (no-key-material, too-short, illegible,
   needs-physical-access) can be closed only by something new: a key
   or a deciphered sibling found elsewhere, a better image, a printed edition or calendar, a photograph from the archive.
   For those, search for that material first, and say where you looked even when you find nothing.
2. Start from the existing key and transcription in the folder. Do not rebuild the key from scratch, and do not
   re-read parts that are already read unless you find an error in them.
3. For a code group or sign value: list every place the group occurs, show how each reads with the value you propose,
   and say what still does not fit. For a passage: re-read it at the image and give the folio and line. For a missing
   letter or leaf: say where it is held and how it can be reached.
4. Measure again. Apply the key to the whole text, write the reading file, and count the share of cipher tokens that
   give sense (not an estimate). The reading is "complete" only when (1) at least 95% of its cipher tokens give sense;
   (2) no gap is left untried; (3) every letter in it is covered; (4) what stays open is scattered code groups or names,
   or pieces blocked from outside. Otherwise it stays "partial": say which gaps are still open and why.
5. Be honest. Mark every uncertain word with [?], leave unread groups as their numbers or signs, and never fill a gap
   with a plausible guess. A gap retried and still open, with what was ruled out, is worth reporting.

REPORT BACK
With a clone: open a pull request with your changes to targets/geleen1633/. Say in the description which gaps you worked on,
  the share read before and after, and how you want to be credited (name, initials or handle, and a link).
Without one: open an issue: https://github.com/dbourdeau/cyphersolver/issues/new?template=further-reading.yml&title=Further+reading%3A+geleen1633&page=geleen1633.html
  Give the write-up, the gap you worked on (its line in Remaining gaps, or the code group, folio and line), what you
  propose, the evidence (every occurrence, the images or sources), the share read before and after, your step log,
  and the tools and AI model you used.
If you cannot open issues or pull requests, write this report for your human to send. Credit goes to the person who sends it.

Open gaps

gold can be done now: the images and the key are online, it needs only work. grey needs a new source first: a key, a better scan, an edition or the archive.

Already tried

Needs the archive

These gaps can only be closed from the original or a book out of reach. If you can visit or order, take one: all archive requests.

Send a result

One closed gap counts: a code group valued, a passage re-read, a key or clear copy found elsewhere. It is credited to you on the write-up.

Open a further-reading issueOther kinds of reportHow credit works← All partial readings