The EBU has published 2023 updates to the White Book and the Blue Book. The Blue Book includes regulations and interpretations for online events. trowBRIDGEclub runs its online events in accordance with these regulations except that the club does not allow Undo's in bidding or play. There are also some changes to alerting and announcing regulations.
The makeable contracts that appear on the hands’ record are an analysis produced by the Deep Finesse programme. You can download a free copy for your personal use from <this > website.