Stopping the Charleston and the Optional Across Pass (Article ID 119)
Abstract: If a player stops the Charleston, he still can do an optional across.
Question from a player: A player elects to stop the Charleston after the 1st left. The Charleston is stopped. Can that player offer any tiles in the optional pass?
Answer from the NMJL: “After you have completed the three passes in the first and/or second Charleston, you have the option to make one final pass. This pass is always the last pass of the Charleston. One, two or three or no tiles may be passed to the player sitting opposite.”
Source: National Mah Jongg League Bulletin Q&A 2013
Other answer from the NMJL:
“The player who stopped the Charleston can still offer one, two or even three tiles to her opposite player.”
Source: Mah Jongg Made Easy 2020 page 13, (Optional Pass) para. 1 https://www.nationalmahjonggleague.org