Breaking the Wall (Article ID 11)
Article: East rolls two dice then counts the stacks of tiles (a stack includes both the top and bottom tiers of the wall) from right to left according to the sum rolled on the dice. After counting, East creates a gap or “break” in the wall at that point. The wall to the left of the break is pushed to the center of the table at a 45-degree angle. The tiles to the right of the break remain where they are because they are a continuation of the last full wall to the right in front of Player 2. Refer to the illustration below.
Source: Mah Jongg Made Easy 2020, page 10 (illustration only) http://www.nationalmahjonggleague.org