At the next tournament each referee scans a QR code for their match and scores rally by rally on their phone. Scores appear straight away on the screen in the hall and on this website.
One referee per match
A match can only be scored from one phone at a time. If a phone dies, the desk moves the match to a new phone and scoring carries on from the exact same point.
If the Wi-Fi drops
The referee keeps scoring. Points are saved on the phone and sent in order as soon as the connection is back, so no rally is lost or counted twice. Paper scoresheets stay on every court as a backup.