your camera scores the game β beta
Prop your phone (or a webcam) so the whole board fills most of the frame, slightly above board height looking a touch down is ideal. Fixed and steady β a tripod, shelf, or taped-down phone. Good, even light matters more than resolution.
Each throw is caught by frame differencing: when the picture settles after a dart lands, the tracker diffs against the previous settled frame β the new dart is the only change. Its tip (the thin end of the blob) is mapped through your one-time 4-point calibration onto real board coordinates in millimetres, and scored with the same WDF-spec geometry as the solver. Every dart's landing spot is kept, so Practice mode can measure your true scatter Ο and save it as your solver profile. Misreads happen β tap any dart chip to fix it, scores replay instantly.
Slide each dot to the outer edge of the double ring where the labelled wedge's centerline meets it: 20 top, 6 right, 3 bottom, 11 left. The dot moves with your finger (not to it) β watch the magnifier crosshair, that is exactly where the dot is. Use the arrow buttons for the last millimetre. The green wireframe should snap onto the rings everywhere.