One chord a day, drawn by the whole Warrior Network from a single shared seed: a hash of the calendar date over a curated pool, so every sister site is looking at exactly the chord you are. What changes from site to site is the answer, and on a charango the answer is a stroke.
A charango does not fret a chord and leave it ringing. It rakes the shape with the whole hand — a rasgueo, a short repeating stroke pattern across all five courses — so the useful question about today's chord is not "what is the grip" but "what does each course sound once the hand crosses it, and do the two E courses still agree".
The page answers by tracking the twin E: it names the pitch each of the two E courses sounds in today's voicing, checks whether each is a chord tone, and reports whether the pair still lands an octave apart (fretted the same amount) or has split under this particular shape. Same voicing, same reading, every time.
The shape is computed in your browser, from your own calendar date, and never on the server: rendered pages here are cached at the edge for hours at a time, so a date baked into the HTML would cheerfully hand you yesterday's chord a minute after midnight. Once the page knows what day it is where you are, today's chord and its twin-E reading appear below.
While you wait — or if scripting is off — the rasgueo pages have all three cells recomputed note by note, and the chord reference has the whole library.