Bent Feather - which part of my badminton is losing me points?

Log 4 to 16 badminton points you lost in one session - what happened, and whether it was your mistake or their winner - and find the one stage of the rally costing you the most. Free in the browser: a shuttlecock with one feather per lost point, the page's keyword guess of each point's rally stage, the rally drawn as a pipeline, a pain-word check and SVG and PNG downloads. One metered task labels every point, finds the binding stage by a fixed rule (own goal, under pressure or spread thin) and coaches that stage only: one thing to do next game, what to leave alone, one drill and what to tally next session; the page re-checks the verdict against the run's own stage labels. Pain words get a stop-and-get-it-checked note. Built on @tjboudreaux/thinking-theory-of-constraints.