July 9, 2018
The 2017 edition of the Laws of Duplicate Bridge brought in many small changes, and one huge one: Law 23, the Comparable Call rule. The intent is to preserve a bridge result in place of the rather severe penalties of earlier laws. It's not a bad thing, but we'll be adapting to it for quite a while.
Imagine this situation: LHO (Left-hand opponent) is the dealer, but you're distracted with a good hand and you put down a 1♠ bid. The director is called, and your bid-out-of-turn is not accepted by the opponents.
The director cancels your bid, and the auction reverts to LHO who passes. Your partner has no restrictions, but is not allowed to act on the unauthorized information of your 1♠ bid. Partner opens 1♥. RHO passes.