Whichever of two parties has the division, the other has the choice.

Explanation

(English-origin maxim.) When one party divides a disputed matter, the other party has the right of first choice — this ensures fairness by giving the divider an incentive to divide equally.

Where this applies

• In a divorce, one spouse divides the household property into two groups, and the other spouse gets to pick which group she wants — the divider must be fair because the chooser picks.
• Two business partners dissolving their company agree that one will split the client list into two halves, and the other will choose which half to keep.
• Two heirs settle an estate dispute by having one divide the assets into equal portions and the other choose first — the one who divides has every incentive to divide fairly.