House Rules, settled before the argument starts.

THE SECOND DRAFT

The rulebook is a first draft. Your table wrote the second one years ago.

Almost every long-running family game is being played wrong, and almost none of those tables are doing anything wrong. A rule gets misread on the first night and never re-read. A punishing rule quietly disappears the week a six-year-old cries about it. Somebody’s cousin taught it a different way and that version is the one that stuck. Designers know this perfectly well — a great many modern rulebooks now close with a page of suggested variants, which is a designer admitting in print that the printed rules are an opening position rather than a verdict.

So the question is never whether you are allowed to change a rule. You are, and you already have. The question is how much agreement this particular change needs, and by when — and that turns out to be one measurable thing: how far back into play that has already happened the change reaches. A rule announced at the moment it starts costing somebody something is not a rule, it is a ruling. Rulings made by whoever is currently winning are how game nights end early.

There are four depths and they nest. A change that touches only how a turn is handled — take-backs, reminders, whether you may think out loud — reaches nothing already played, so it can be introduced on the last turn of the game and nobody has grounds to object. A change that alters a move still to come reaches exactly one move, so say it before the move. A change that would have made somebody’s opening plan wrong reaches all the way back to setup, so it is agreed at setup or it is not agreed at all. And a change to what winning is reaches past this game entirely: it is now the version your family plays, and it belongs written down where the next argument can find it.

That last part is the bit people skip. A house rule kept in somebody’s head is re-argued every single time it comes up, and the person who remembers it most confidently is usually the person it favours. On a card taped inside the lid — one line per rule, the date, and the name of whoever asked for it — it stops being a claim and becomes furniture. It also becomes repealable, which matters more than it sounds: the rule you wrote for a five-year-old is still on the card when they are nine, and a written rule can be voted out without anybody having to relitigate what was agreed.