Section 6: Variants & House Rules

Schedule 2, section 4 permits a game to use any number from five through eight decks, but never fewer than five or more than eight under the standard rules. The selected deck count is therefore an operational choice within an exact official range.

Source: section 3, section 29, section 4, section 8, section 9, section 10, section 23, section 15, section 25, section 26, section 27

Send this to your friend — argument over.