What happens if a player goes to drop from a tournament right after pairings have been posted?

If a player attempts to drop from a tournament immediately after the pairings have been posted, the appropriate action is to ensure that the player cannot drop, and the pairings will remain as they are. Once pairings are posted, they are considered finalized for that round, and a player's intention to drop does not alter the fact that they have been matched against an opponent for that round.

It is important to adhere to the timing and procedural regulations outlined in the Magic Tournament Rules. Players need to follow the correct protocol for dropping, which generally requires them to do so before pairings are posted. If a player decides to leave after that point, the established rules maintain the integrity of the tournament and the opponent's right to a fair match. As a result, the player would not be able to drop successfully, and the pairings will stand as published.