major and minor in one position · two octaves from the root
Built as a memo rather than a table: the thing worth hanging it up for reads across the room, with the full reference in smaller type below it.
Three sizes in one archive — from a sheet on the fridge to a poster on the wall.
The filled dot is the root and the figure inside each dot is the degree of the triad. The dots are calculated from standard tuning; the sheet prescribes no left-hand fingering.
The first and sixth strings sit exactly two octaves apart — 24 semitones. That is not a coincidence or a convenience: it is what standard tuning adds up to, four fourths and one major third.
The consequence is visible on the grid. The same fret on the thinnest string gives the same note as on the thickest, two octaves higher, so an arpeggio from the root at fret 5 ends on the root at fret 5. The position covers 24 semitones — exactly two octaves, and no other string count does that.
Minor is not a separate shape either: the run is the same one, with only the third dropping a semitone. One of the two thirds simply steps back a fret on its own string; the other would land on the first fret, outside the position, so the same note is taken on the neighbouring string instead. Nothing else moves at all.
Why the numbers can be trusted. Every countable number here is computed from data rather than typed in, and the sheet must pass 12 independent checks before it is allowed to build — how many items there are, the order they come in, and the claim in the highlighted box itself. If one fails, there is no file.
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