Two notes to a stroke, all the way through: the simplest partition available and the most useful diagnostic. Because every bow change now falls in the same place relative to the beat, any unevenness in your changes becomes rhythmically obvious rather than vaguely uncomfortable.
The partition
The pattern declares one thing: its repeating group-length cycle, 2, starting on a down bow. Over eight notes that produces exactly this, and the directions alternate by construction — a boundary the bow did not reverse at would not be a boundary:
| Stroke | Notes | Length | Direction |
|---|---|---|---|
| 1 | 1, 2 | 2 | down |
| 2 | 3, 4 | 2 | up |
| 3 | 5, 6 | 2 | down |
| 4 | 7, 8 | 2 | up |
4 of 4 strokes start on a beat when the eight notes are eighth notes in common time. That number is the pattern's character: strokes landing off the beat are what a listener hears as lift.
Across the strings
This pattern says nothing about which string each note is on, which is exactly why it composes: apply it to a line that stays on one string and it shapes the rhythm; apply it to a line that crosses and the bow changes and the crossings start interacting. The real pairs a bow can lean between are G–D, D–A, A–E.
Practising it
Put it on an open string first, with the left hand doing nothing at all. The pattern is a right-arm skill and mixing it with a fingering problem just hides which one is failing. Once it is automatic, run it over a scale, and only then over a tune.
Watch the bow rather than the fingers. Every note in a group shares one stroke, so the length of a group is a distance along the hair — an even partition needs even distribution, not just even timing.