Revision history
Every change to the guide, or to the rules it follows, is entered here with its date, newest first. Entries are never rewritten afterwards.
A data entry means cards were added or revised; a correction came in from a reader through the form; wording and method entries concern the text of the site and the way its cards are made.
| Date | What changed | |
|---|---|---|
| Opening | Chess in Sofia opens with 27 cards, 27 of them active or awaiting a newer trace; all the pages behind them were read on 15 October 2026. | |