ACBL. Club game. Matchpoints.
Before you conclude E is completely daft, consider that the following is the hand she was looking at, selected from the previous board.
I was called to the table after S passed, ending the auction and E realized that she had the wrong cards. I instructed the players to score the board using the table result.
L17D allows for the canceling of a call on cards picked up from a wrong board and for the player to make a call from the correct hand. L17D does not address what to do if the auction has ended. Under L17D, once the offender changes his call, the director shall award an artificial adjusted score. There was nothing to be gained by reopening the auction since there would be no point in playing the hand. We'll talk about scoring in a moment.
What I found interesting is that LDB doesn't seem to address this specific set of facts and circumstances. L22 says the auction ends when all four players have passed. The auction period ends on a pass out when all four hands have been returned to the board. Arguably, the auction period hasn't ended since the error was discovered AS the hands were being returned to the board. L21 allows for changing a call until the end of the auction period, but not if the caller is the offender. Yet L17D seems to allow for the auction to be reopened if a call has been made using cards picked up from a wrong board. I believe the fourth pass takes away the ability for E to change her call using the correct cards.
Was NS damaged? No. At all but one other table, EW were in 4♠ but the contract failed three times. Awarding an artificial adjusted score under L12C.2.(a) of 60% to NS would reduce their total match points by 1.8. Poor EW had a below 40% game, but ignoring the implications of that additional adjustment, they received a lower award than if I had scored the board as A-. However, I could still make a quarter-board PP and get them back to below where the table result landed them. There would be no change in the rankings regardless of how the adjustments might be handed out.
I look forward to your comments.